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  1. /*
  2.  * Mesa 3-D graphics library
  3.  *
  4.  * Copyright (C) 2004-2008  Brian Paul   All Rights Reserved.
  5.  * Copyright (C) 2009-2010  VMware, Inc.  All Rights Reserved.
  6.  *
  7.  * Permission is hereby granted, free of charge, to any person obtaining a
  8.  * copy of this software and associated documentation files (the "Software"),
  9.  * to deal in the Software without restriction, including without limitation
  10.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11.  * and/or sell copies of the Software, and to permit persons to whom the
  12.  * Software is furnished to do so, subject to the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice shall be included
  15.  * in all copies or substantial portions of the Software.
  16.  *
  17.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23.  * OTHER DEALINGS IN THE SOFTWARE.
  24.  */
  25.  
  26. /**
  27.  * \file shaderapi.c
  28.  * \author Brian Paul
  29.  *
  30.  * Implementation of GLSL-related API functions.
  31.  * The glUniform* functions are in uniforms.c
  32.  *
  33.  *
  34.  * XXX things to do:
  35.  * 1. Check that the right error code is generated for all _mesa_error() calls.
  36.  * 2. Insert FLUSH_VERTICES calls in various places
  37.  */
  38.  
  39.  
  40. #include "main/glheader.h"
  41. #include "main/context.h"
  42. #include "main/dispatch.h"
  43. #include "main/enums.h"
  44. #include "main/hash.h"
  45. #include "main/mtypes.h"
  46. #include "main/shaderapi.h"
  47. #include "main/shaderobj.h"
  48. #include "main/transformfeedback.h"
  49. #include "main/uniforms.h"
  50. #include "program/program.h"
  51. #include "program/prog_print.h"
  52. #include "program/prog_parameter.h"
  53. #include "ralloc.h"
  54. #include <stdbool.h>
  55. #include "../glsl/glsl_parser_extras.h"
  56. #include "../glsl/ir.h"
  57. #include "../glsl/ir_uniform.h"
  58. #include "../glsl/program.h"
  59.  
  60. /** Define this to enable shader substitution (see below) */
  61. #define SHADER_SUBST 0
  62.  
  63.  
  64. /**
  65.  * Return mask of GLSL_x flags by examining the MESA_GLSL env var.
  66.  */
  67. static GLbitfield
  68. get_shader_flags(void)
  69. {
  70.    GLbitfield flags = 0x0;
  71.    const char *env = _mesa_getenv("MESA_GLSL");
  72.  
  73.    if (env) {
  74.       if (strstr(env, "dump"))
  75.          flags |= GLSL_DUMP;
  76.       if (strstr(env, "log"))
  77.          flags |= GLSL_LOG;
  78.       if (strstr(env, "nopvert"))
  79.          flags |= GLSL_NOP_VERT;
  80.       if (strstr(env, "nopfrag"))
  81.          flags |= GLSL_NOP_FRAG;
  82.       if (strstr(env, "nopt"))
  83.          flags |= GLSL_NO_OPT;
  84.       else if (strstr(env, "opt"))
  85.          flags |= GLSL_OPT;
  86.       if (strstr(env, "uniform"))
  87.          flags |= GLSL_UNIFORMS;
  88.       if (strstr(env, "useprog"))
  89.          flags |= GLSL_USE_PROG;
  90.       if (strstr(env, "errors"))
  91.          flags |= GLSL_REPORT_ERRORS;
  92.    }
  93.  
  94.    return flags;
  95. }
  96.  
  97.  
  98. /**
  99.  * Initialize context's shader state.
  100.  */
  101. void
  102. _mesa_init_shader_state(struct gl_context *ctx)
  103. {
  104.    /* Device drivers may override these to control what kind of instructions
  105.     * are generated by the GLSL compiler.
  106.     */
  107.    struct gl_shader_compiler_options options;
  108.    gl_shader_type sh;
  109.  
  110.    memset(&options, 0, sizeof(options));
  111.    options.MaxUnrollIterations = 32;
  112.    options.MaxIfDepth = UINT_MAX;
  113.  
  114.    /* Default pragma settings */
  115.    options.DefaultPragmas.Optimize = GL_TRUE;
  116.  
  117.    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh)
  118.       memcpy(&ctx->ShaderCompilerOptions[sh], &options, sizeof(options));
  119.  
  120.    ctx->Shader.Flags = get_shader_flags();
  121. }
  122.  
  123.  
  124. /**
  125.  * Free the per-context shader-related state.
  126.  */
  127. void
  128. _mesa_free_shader_state(struct gl_context *ctx)
  129. {
  130.    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentVertexProgram, NULL);
  131.    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentGeometryProgram,
  132.                                   NULL);
  133.    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentFragmentProgram,
  134.                                   NULL);
  135.    _mesa_reference_shader_program(ctx, &ctx->Shader._CurrentFragmentProgram,
  136.                                   NULL);
  137.    _mesa_reference_shader_program(ctx, &ctx->Shader.ActiveProgram, NULL);
  138. }
  139.  
  140.  
  141. /**
  142.  * Copy string from <src> to <dst>, up to maxLength characters, returning
  143.  * length of <dst> in <length>.
  144.  * \param src  the strings source
  145.  * \param maxLength  max chars to copy
  146.  * \param length  returns number of chars copied
  147.  * \param dst  the string destination
  148.  */
  149. void
  150. _mesa_copy_string(GLchar *dst, GLsizei maxLength,
  151.                   GLsizei *length, const GLchar *src)
  152. {
  153.    GLsizei len;
  154.    for (len = 0; len < maxLength - 1 && src && src[len]; len++)
  155.       dst[len] = src[len];
  156.    if (maxLength > 0)
  157.       dst[len] = 0;
  158.    if (length)
  159.       *length = len;
  160. }
  161.  
  162.  
  163.  
  164. /**
  165.  * Confirm that the a shader type is valid and supported by the implementation
  166.  *
  167.  * \param ctx   Current GL context
  168.  * \param type  Shader target
  169.  *
  170.  */
  171. static bool
  172. validate_shader_target(const struct gl_context *ctx, GLenum type)
  173. {
  174.    switch (type) {
  175.    case GL_FRAGMENT_SHADER:
  176.       return ctx->Extensions.ARB_fragment_shader;
  177.    case GL_VERTEX_SHADER:
  178.       return ctx->Extensions.ARB_vertex_shader;
  179.    case GL_GEOMETRY_SHADER_ARB:
  180.       return _mesa_is_desktop_gl(ctx) && ctx->Extensions.ARB_geometry_shader4;
  181.    default:
  182.       return false;
  183.    }
  184. }
  185.  
  186.  
  187. static GLboolean
  188. is_program(struct gl_context *ctx, GLuint name)
  189. {
  190.    struct gl_shader_program *shProg = _mesa_lookup_shader_program(ctx, name);
  191.    return shProg ? GL_TRUE : GL_FALSE;
  192. }
  193.  
  194.  
  195. static GLboolean
  196. is_shader(struct gl_context *ctx, GLuint name)
  197. {
  198.    struct gl_shader *shader = _mesa_lookup_shader(ctx, name);
  199.    return shader ? GL_TRUE : GL_FALSE;
  200. }
  201.  
  202.  
  203. /**
  204.  * Attach shader to a shader program.
  205.  */
  206. static void
  207. attach_shader(struct gl_context *ctx, GLuint program, GLuint shader)
  208. {
  209.    struct gl_shader_program *shProg;
  210.    struct gl_shader *sh;
  211.    GLuint i, n;
  212.  
  213.    const bool same_type_disallowed = _mesa_is_gles(ctx);
  214.  
  215.    shProg = _mesa_lookup_shader_program_err(ctx, program, "glAttachShader");
  216.    if (!shProg)
  217.       return;
  218.  
  219.    sh = _mesa_lookup_shader_err(ctx, shader, "glAttachShader");
  220.    if (!sh) {
  221.       return;
  222.    }
  223.  
  224.    n = shProg->NumShaders;
  225.    for (i = 0; i < n; i++) {
  226.       if (shProg->Shaders[i] == sh) {
  227.          /* The shader is already attched to this program.  The
  228.           * GL_ARB_shader_objects spec says:
  229.           *
  230.           *     "The error INVALID_OPERATION is generated by AttachObjectARB
  231.           *     if <obj> is already attached to <containerObj>."
  232.           */
  233.          _mesa_error(ctx, GL_INVALID_OPERATION, "glAttachShader");
  234.          return;
  235.       } else if (same_type_disallowed &&
  236.                  shProg->Shaders[i]->Type == sh->Type) {
  237.         /* Shader with the same type is already attached to this program,
  238.          * OpenGL ES 2.0 and 3.0 specs say:
  239.          *
  240.          *      "Multiple shader objects of the same type may not be attached
  241.          *      to a single program object. [...] The error INVALID_OPERATION
  242.          *      is generated if [...] another shader object of the same type
  243.          *      as shader is already attached to program."
  244.          */
  245.          _mesa_error(ctx, GL_INVALID_OPERATION, "glAttachShader");
  246.          return;
  247.       }
  248.    }
  249.  
  250.    /* grow list */
  251.    shProg->Shaders = (struct gl_shader **)
  252.       _mesa_realloc(shProg->Shaders,
  253.                     n * sizeof(struct gl_shader *),
  254.                     (n + 1) * sizeof(struct gl_shader *));
  255.    if (!shProg->Shaders) {
  256.       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAttachShader");
  257.       return;
  258.    }
  259.  
  260.    /* append */
  261.    shProg->Shaders[n] = NULL; /* since realloc() didn't zero the new space */
  262.    _mesa_reference_shader(ctx, &shProg->Shaders[n], sh);
  263.    shProg->NumShaders++;
  264. }
  265.  
  266.  
  267. static GLuint
  268. create_shader(struct gl_context *ctx, GLenum type)
  269. {
  270.    struct gl_shader *sh;
  271.    GLuint name;
  272.  
  273.    if (!validate_shader_target(ctx, type)) {
  274.       _mesa_error(ctx, GL_INVALID_ENUM, "CreateShader(type)");
  275.       return 0;
  276.    }
  277.  
  278.    name = _mesa_HashFindFreeKeyBlock(ctx->Shared->ShaderObjects, 1);
  279.    sh = ctx->Driver.NewShader(ctx, name, type);
  280.    _mesa_HashInsert(ctx->Shared->ShaderObjects, name, sh);
  281.  
  282.    return name;
  283. }
  284.  
  285.  
  286. static GLuint
  287. create_shader_program(struct gl_context *ctx)
  288. {
  289.    GLuint name;
  290.    struct gl_shader_program *shProg;
  291.  
  292.    name = _mesa_HashFindFreeKeyBlock(ctx->Shared->ShaderObjects, 1);
  293.  
  294.    shProg = ctx->Driver.NewShaderProgram(ctx, name);
  295.  
  296.    _mesa_HashInsert(ctx->Shared->ShaderObjects, name, shProg);
  297.  
  298.    assert(shProg->RefCount == 1);
  299.  
  300.    return name;
  301. }
  302.  
  303.  
  304. /**
  305.  * Named w/ "2" to indicate OpenGL 2.x vs GL_ARB_fragment_programs's
  306.  * DeleteProgramARB.
  307.  */
  308. static void
  309. delete_shader_program(struct gl_context *ctx, GLuint name)
  310. {
  311.    /*
  312.     * NOTE: deleting shaders/programs works a bit differently than
  313.     * texture objects (and buffer objects, etc).  Shader/program
  314.     * handles/IDs exist in the hash table until the object is really
  315.     * deleted (refcount==0).  With texture objects, the handle/ID is
  316.     * removed from the hash table in glDeleteTextures() while the tex
  317.     * object itself might linger until its refcount goes to zero.
  318.     */
  319.    struct gl_shader_program *shProg;
  320.  
  321.    shProg = _mesa_lookup_shader_program_err(ctx, name, "glDeleteProgram");
  322.    if (!shProg)
  323.       return;
  324.  
  325.    if (!shProg->DeletePending) {
  326.       shProg->DeletePending = GL_TRUE;
  327.  
  328.       /* effectively, decr shProg's refcount */
  329.       _mesa_reference_shader_program(ctx, &shProg, NULL);
  330.    }
  331. }
  332.  
  333.  
  334. static void
  335. delete_shader(struct gl_context *ctx, GLuint shader)
  336. {
  337.    struct gl_shader *sh;
  338.  
  339.    sh = _mesa_lookup_shader_err(ctx, shader, "glDeleteShader");
  340.    if (!sh)
  341.       return;
  342.  
  343.    if (!sh->DeletePending) {
  344.       sh->DeletePending = GL_TRUE;
  345.  
  346.       /* effectively, decr sh's refcount */
  347.       _mesa_reference_shader(ctx, &sh, NULL);
  348.    }
  349. }
  350.  
  351.  
  352. static void
  353. detach_shader(struct gl_context *ctx, GLuint program, GLuint shader)
  354. {
  355.    struct gl_shader_program *shProg;
  356.    GLuint n;
  357.    GLuint i, j;
  358.  
  359.    shProg = _mesa_lookup_shader_program_err(ctx, program, "glDetachShader");
  360.    if (!shProg)
  361.       return;
  362.  
  363.    n = shProg->NumShaders;
  364.  
  365.    for (i = 0; i < n; i++) {
  366.       if (shProg->Shaders[i]->Name == shader) {
  367.          /* found it */
  368.          struct gl_shader **newList;
  369.  
  370.          /* release */
  371.          _mesa_reference_shader(ctx, &shProg->Shaders[i], NULL);
  372.  
  373.          /* alloc new, smaller array */
  374.          newList =
  375.             malloc((n - 1) * sizeof(struct gl_shader *));
  376.          if (!newList) {
  377.             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDetachShader");
  378.             return;
  379.          }
  380.          for (j = 0; j < i; j++) {
  381.             newList[j] = shProg->Shaders[j];
  382.          }
  383.          while (++i < n)
  384.             newList[j++] = shProg->Shaders[i];
  385.          free(shProg->Shaders);
  386.  
  387.          shProg->Shaders = newList;
  388.          shProg->NumShaders = n - 1;
  389.  
  390. #ifdef DEBUG
  391.          /* sanity check */
  392.          {
  393.             for (j = 0; j < shProg->NumShaders; j++) {
  394.                assert(shProg->Shaders[j]->Type == GL_VERTEX_SHADER ||
  395.                       shProg->Shaders[j]->Type == GL_FRAGMENT_SHADER);
  396.                assert(shProg->Shaders[j]->RefCount > 0);
  397.             }
  398.          }
  399. #endif
  400.  
  401.          return;
  402.       }
  403.    }
  404.  
  405.    /* not found */
  406.    {
  407.       GLenum err;
  408.       if (is_shader(ctx, shader))
  409.          err = GL_INVALID_OPERATION;
  410.       else if (is_program(ctx, shader))
  411.          err = GL_INVALID_OPERATION;
  412.       else
  413.          err = GL_INVALID_VALUE;
  414.       _mesa_error(ctx, err, "glDetachProgram(shader)");
  415.       return;
  416.    }
  417. }
  418.  
  419.  
  420. /**
  421.  * Return list of shaders attached to shader program.
  422.  */
  423. static void
  424. get_attached_shaders(struct gl_context *ctx, GLuint program, GLsizei maxCount,
  425.                      GLsizei *count, GLuint *obj)
  426. {
  427.    struct gl_shader_program *shProg =
  428.       _mesa_lookup_shader_program_err(ctx, program, "glGetAttachedShaders");
  429.    if (shProg) {
  430.       GLuint i;
  431.       for (i = 0; i < (GLuint) maxCount && i < shProg->NumShaders; i++) {
  432.          obj[i] = shProg->Shaders[i]->Name;
  433.       }
  434.       if (count)
  435.          *count = i;
  436.    }
  437. }
  438.  
  439.  
  440. /**
  441.  * glGetHandleARB() - return ID/name of currently bound shader program.
  442.  */
  443. static GLuint
  444. get_handle(struct gl_context *ctx, GLenum pname)
  445. {
  446.    if (pname == GL_PROGRAM_OBJECT_ARB) {
  447.       if (ctx->Shader.ActiveProgram)
  448.          return ctx->Shader.ActiveProgram->Name;
  449.       else
  450.          return 0;
  451.    }
  452.    else {
  453.       _mesa_error(ctx, GL_INVALID_ENUM, "glGetHandleARB");
  454.       return 0;
  455.    }
  456. }
  457.  
  458.  
  459. /**
  460.  * glGetProgramiv() - get shader program state.
  461.  * Note that this is for GLSL shader programs, not ARB vertex/fragment
  462.  * programs (see glGetProgramivARB).
  463.  */
  464. static void
  465. get_programiv(struct gl_context *ctx, GLuint program, GLenum pname, GLint *params)
  466. {
  467.    struct gl_shader_program *shProg
  468.       = _mesa_lookup_shader_program(ctx, program);
  469.  
  470.    /* Is transform feedback available in this context?
  471.     */
  472.    const bool has_xfb =
  473.       (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.EXT_transform_feedback)
  474.       || ctx->API == API_OPENGL_CORE
  475.       || _mesa_is_gles3(ctx);
  476.  
  477.    /* Are geometry shaders available in this context?
  478.     */
  479.    const bool has_gs =
  480.       _mesa_is_desktop_gl(ctx) && ctx->Extensions.ARB_geometry_shader4;
  481.  
  482.    /* Are uniform buffer objects available in this context?
  483.     */
  484.    const bool has_ubo =
  485.       (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.ARB_uniform_buffer_object)
  486.       || ctx->API == API_OPENGL_CORE
  487.       || _mesa_is_gles3(ctx);
  488.  
  489.    if (!shProg) {
  490.       _mesa_error(ctx, GL_INVALID_VALUE, "glGetProgramiv(program)");
  491.       return;
  492.    }
  493.  
  494.    switch (pname) {
  495.    case GL_DELETE_STATUS:
  496.       *params = shProg->DeletePending;
  497.       return;
  498.    case GL_LINK_STATUS:
  499.       *params = shProg->LinkStatus;
  500.       return;
  501.    case GL_VALIDATE_STATUS:
  502.       *params = shProg->Validated;
  503.       return;
  504.    case GL_INFO_LOG_LENGTH:
  505.       *params = shProg->InfoLog ? strlen(shProg->InfoLog) + 1 : 0;
  506.       return;
  507.    case GL_ATTACHED_SHADERS:
  508.       *params = shProg->NumShaders;
  509.       return;
  510.    case GL_ACTIVE_ATTRIBUTES:
  511.       *params = _mesa_count_active_attribs(shProg);
  512.       return;
  513.    case GL_ACTIVE_ATTRIBUTE_MAX_LENGTH:
  514.       *params = _mesa_longest_attribute_name_length(shProg);
  515.       return;
  516.    case GL_ACTIVE_UNIFORMS:
  517.       *params = shProg->NumUserUniformStorage;
  518.       return;
  519.    case GL_ACTIVE_UNIFORM_MAX_LENGTH: {
  520.       unsigned i;
  521.       GLint max_len = 0;
  522.  
  523.       for (i = 0; i < shProg->NumUserUniformStorage; i++) {
  524.          /* Add one for the terminating NUL character for a non-array, and
  525.           * 4 for the "[0]" and the NUL for an array.
  526.           */
  527.          const GLint len = strlen(shProg->UniformStorage[i].name) + 1 +
  528.              ((shProg->UniformStorage[i].array_elements != 0) ? 3 : 0);
  529.  
  530.          if (len > max_len)
  531.             max_len = len;
  532.       }
  533.  
  534.       *params = max_len;
  535.       return;
  536.    }
  537.    case GL_TRANSFORM_FEEDBACK_VARYINGS:
  538.       if (!has_xfb)
  539.          break;
  540.       *params = shProg->TransformFeedback.NumVarying;
  541.       return;
  542.    case GL_TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH: {
  543.       unsigned i;
  544.       GLint max_len = 0;
  545.       if (!has_xfb)
  546.          break;
  547.  
  548.       for (i = 0; i < shProg->TransformFeedback.NumVarying; i++) {
  549.          /* Add one for the terminating NUL character.
  550.           */
  551.          const GLint len = strlen(shProg->TransformFeedback.VaryingNames[i]) + 1;
  552.  
  553.          if (len > max_len)
  554.             max_len = len;
  555.       }
  556.  
  557.       *params = max_len;
  558.       return;
  559.    }
  560.    case GL_TRANSFORM_FEEDBACK_BUFFER_MODE:
  561.       if (!has_xfb)
  562.          break;
  563.       *params = shProg->TransformFeedback.BufferMode;
  564.       return;
  565.    case GL_GEOMETRY_VERTICES_OUT_ARB:
  566.       if (!has_gs)
  567.          break;
  568.       *params = shProg->Geom.VerticesOut;
  569.       return;
  570.    case GL_GEOMETRY_INPUT_TYPE_ARB:
  571.       if (!has_gs)
  572.          break;
  573.       *params = shProg->Geom.InputType;
  574.       return;
  575.    case GL_GEOMETRY_OUTPUT_TYPE_ARB:
  576.       if (!has_gs)
  577.          break;
  578.       *params = shProg->Geom.OutputType;
  579.       return;
  580.    case GL_ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH: {
  581.       unsigned i;
  582.       GLint max_len = 0;
  583.  
  584.       if (!has_ubo)
  585.          break;
  586.  
  587.       for (i = 0; i < shProg->NumUniformBlocks; i++) {
  588.          /* Add one for the terminating NUL character.
  589.           */
  590.          const GLint len = strlen(shProg->UniformBlocks[i].Name) + 1;
  591.  
  592.          if (len > max_len)
  593.             max_len = len;
  594.       }
  595.  
  596.       *params = max_len;
  597.       return;
  598.    }
  599.    case GL_ACTIVE_UNIFORM_BLOCKS:
  600.       if (!has_ubo)
  601.          break;
  602.  
  603.       *params = shProg->NumUniformBlocks;
  604.       return;
  605.    case GL_PROGRAM_BINARY_RETRIEVABLE_HINT:
  606.       /* This enum isn't part of the OES extension for OpenGL ES 2.0.  It is
  607.        * only available with desktop OpenGL 3.0+ with the
  608.        * GL_ARB_get_program_binary extension or OpenGL ES 3.0.
  609.        *
  610.        * On desktop, we ignore the 3.0+ requirement because it is silly.
  611.        */
  612.       if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
  613.          break;
  614.  
  615.       *params = shProg->BinaryRetreivableHint;
  616.       return;
  617.    case GL_PROGRAM_BINARY_LENGTH:
  618.       *params = 0;
  619.       return;
  620.    default:
  621.       break;
  622.    }
  623.  
  624.    _mesa_error(ctx, GL_INVALID_ENUM, "glGetProgramiv(pname=%s)",
  625.                _mesa_lookup_enum_by_nr(pname));
  626. }
  627.  
  628.  
  629. /**
  630.  * glGetShaderiv() - get GLSL shader state
  631.  */
  632. static void
  633. get_shaderiv(struct gl_context *ctx, GLuint name, GLenum pname, GLint *params)
  634. {
  635.    struct gl_shader *shader =
  636.       _mesa_lookup_shader_err(ctx, name, "glGetShaderiv");
  637.  
  638.    if (!shader) {
  639.       return;
  640.    }
  641.  
  642.    switch (pname) {
  643.    case GL_SHADER_TYPE:
  644.       *params = shader->Type;
  645.       break;
  646.    case GL_DELETE_STATUS:
  647.       *params = shader->DeletePending;
  648.       break;
  649.    case GL_COMPILE_STATUS:
  650.       *params = shader->CompileStatus;
  651.       break;
  652.    case GL_INFO_LOG_LENGTH:
  653.       *params = shader->InfoLog ? strlen(shader->InfoLog) + 1 : 0;
  654.       break;
  655.    case GL_SHADER_SOURCE_LENGTH:
  656.       *params = shader->Source ? strlen((char *) shader->Source) + 1 : 0;
  657.       break;
  658.    default:
  659.       _mesa_error(ctx, GL_INVALID_ENUM, "glGetShaderiv(pname)");
  660.       return;
  661.    }
  662. }
  663.  
  664.  
  665. static void
  666. get_program_info_log(struct gl_context *ctx, GLuint program, GLsizei bufSize,
  667.                      GLsizei *length, GLchar *infoLog)
  668. {
  669.    struct gl_shader_program *shProg
  670.       = _mesa_lookup_shader_program(ctx, program);
  671.    if (!shProg) {
  672.       _mesa_error(ctx, GL_INVALID_VALUE, "glGetProgramInfoLog(program)");
  673.       return;
  674.    }
  675.    _mesa_copy_string(infoLog, bufSize, length, shProg->InfoLog);
  676. }
  677.  
  678.  
  679. static void
  680. get_shader_info_log(struct gl_context *ctx, GLuint shader, GLsizei bufSize,
  681.                     GLsizei *length, GLchar *infoLog)
  682. {
  683.    struct gl_shader *sh = _mesa_lookup_shader(ctx, shader);
  684.    if (!sh) {
  685.       _mesa_error(ctx, GL_INVALID_VALUE, "glGetShaderInfoLog(shader)");
  686.       return;
  687.    }
  688.    _mesa_copy_string(infoLog, bufSize, length, sh->InfoLog);
  689. }
  690.  
  691.  
  692. /**
  693.  * Return shader source code.
  694.  */
  695. static void
  696. get_shader_source(struct gl_context *ctx, GLuint shader, GLsizei maxLength,
  697.                   GLsizei *length, GLchar *sourceOut)
  698. {
  699.    struct gl_shader *sh;
  700.    sh = _mesa_lookup_shader_err(ctx, shader, "glGetShaderSource");
  701.    if (!sh) {
  702.       return;
  703.    }
  704.    _mesa_copy_string(sourceOut, maxLength, length, sh->Source);
  705. }
  706.  
  707.  
  708. /**
  709.  * Set/replace shader source code.  A helper function used by
  710.  * glShaderSource[ARB] and glCreateShaderProgramEXT.
  711.  */
  712. static void
  713. shader_source(struct gl_context *ctx, GLuint shader, const GLchar *source)
  714. {
  715.    struct gl_shader *sh;
  716.  
  717.    sh = _mesa_lookup_shader_err(ctx, shader, "glShaderSource");
  718.    if (!sh)
  719.       return;
  720.  
  721.    /* free old shader source string and install new one */
  722.    free((void *)sh->Source);
  723.    sh->Source = source;
  724.    sh->CompileStatus = GL_FALSE;
  725. #ifdef DEBUG
  726.    sh->SourceChecksum = _mesa_str_checksum(sh->Source);
  727. #endif
  728. }
  729.  
  730.  
  731. /**
  732.  * Compile a shader.
  733.  */
  734. static void
  735. compile_shader(struct gl_context *ctx, GLuint shaderObj)
  736. {
  737.    struct gl_shader *sh;
  738.    struct gl_shader_compiler_options *options;
  739.  
  740.    sh = _mesa_lookup_shader_err(ctx, shaderObj, "glCompileShader");
  741.    if (!sh)
  742.       return;
  743.  
  744.    options = &ctx->ShaderCompilerOptions[_mesa_shader_type_to_index(sh->Type)];
  745.  
  746.    /* set default pragma state for shader */
  747.    sh->Pragmas = options->DefaultPragmas;
  748.  
  749.    if (!sh->Source) {
  750.       /* If the user called glCompileShader without first calling
  751.        * glShaderSource, we should fail to compile, but not raise a GL_ERROR.
  752.        */
  753.       sh->CompileStatus = GL_FALSE;
  754.    } else {
  755.       if (ctx->Shader.Flags & GLSL_DUMP) {
  756.          printf("GLSL source for %s shader %d:\n",
  757.                 _mesa_glsl_shader_target_name(sh->Type), sh->Name);
  758.          printf("%s\n", sh->Source);
  759.       }
  760.  
  761.       /* this call will set the shader->CompileStatus field to indicate if
  762.        * compilation was successful.
  763.        */
  764.       _mesa_glsl_compile_shader(ctx, sh, false, false);
  765.  
  766.       if (ctx->Shader.Flags & GLSL_LOG) {
  767.          _mesa_write_shader_to_file(sh);
  768.       }
  769.  
  770.       if (ctx->Shader.Flags & GLSL_DUMP) {
  771.          if (sh->CompileStatus) {
  772.             printf("GLSL IR for shader %d:\n", sh->Name);
  773.             _mesa_print_ir(sh->ir, NULL);
  774.             printf("\n\n");
  775.          } else {
  776.             printf("GLSL shader %d failed to compile.\n", sh->Name);
  777.          }
  778.          if (sh->InfoLog && sh->InfoLog[0] != 0) {
  779.             printf("GLSL shader %d info log:\n", sh->Name);
  780.             printf("%s\n", sh->InfoLog);
  781.          }
  782.       }
  783.  
  784.    }
  785.  
  786.    if (sh->CompileStatus == GL_FALSE &&
  787.        (ctx->Shader.Flags & GLSL_REPORT_ERRORS)) {
  788.       _mesa_debug(ctx, "Error compiling shader %u:\n%s\n",
  789.                   sh->Name, sh->InfoLog);
  790.    }
  791. }
  792.  
  793.  
  794. /**
  795.  * Link a program's shaders.
  796.  */
  797. static void
  798. link_program(struct gl_context *ctx, GLuint program)
  799. {
  800.    struct gl_shader_program *shProg;
  801.    struct gl_transform_feedback_object *obj =
  802.       ctx->TransformFeedback.CurrentObject;
  803.  
  804.    shProg = _mesa_lookup_shader_program_err(ctx, program, "glLinkProgram");
  805.    if (!shProg)
  806.       return;
  807.  
  808.    if (obj->Active
  809.        && (shProg == ctx->Shader.CurrentVertexProgram
  810.            || shProg == ctx->Shader.CurrentGeometryProgram
  811.            || shProg == ctx->Shader.CurrentFragmentProgram)) {
  812.       _mesa_error(ctx, GL_INVALID_OPERATION,
  813.                   "glLinkProgram(transform feedback active)");
  814.       return;
  815.    }
  816.  
  817.    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
  818.  
  819.    _mesa_glsl_link_shader(ctx, shProg);
  820.  
  821.    if (shProg->LinkStatus == GL_FALSE &&
  822.        (ctx->Shader.Flags & GLSL_REPORT_ERRORS)) {
  823.       _mesa_debug(ctx, "Error linking program %u:\n%s\n",
  824.                   shProg->Name, shProg->InfoLog);
  825.    }
  826.  
  827.    /* debug code */
  828.    if (0) {
  829.       GLuint i;
  830.  
  831.       printf("Link %u shaders in program %u: %s\n",
  832.                    shProg->NumShaders, shProg->Name,
  833.                    shProg->LinkStatus ? "Success" : "Failed");
  834.  
  835.       for (i = 0; i < shProg->NumShaders; i++) {
  836.          printf(" shader %u, type 0x%x\n",
  837.                       shProg->Shaders[i]->Name,
  838.                       shProg->Shaders[i]->Type);
  839.       }
  840.    }
  841. }
  842.  
  843.  
  844. /**
  845.  * Print basic shader info (for debug).
  846.  */
  847. static void
  848. print_shader_info(const struct gl_shader_program *shProg)
  849. {
  850.    GLuint i;
  851.  
  852.    printf("Mesa: glUseProgram(%u)\n", shProg->Name);
  853.    for (i = 0; i < shProg->NumShaders; i++) {
  854.       printf("  %s shader %u, checksum %u\n",
  855.              _mesa_glsl_shader_target_name(shProg->Shaders[i]->Type),
  856.              shProg->Shaders[i]->Name,
  857.              shProg->Shaders[i]->SourceChecksum);
  858.    }
  859.    if (shProg->_LinkedShaders[MESA_SHADER_VERTEX])
  860.       printf("  vert prog %u\n",
  861.              shProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program->Id);
  862.    if (shProg->_LinkedShaders[MESA_SHADER_FRAGMENT])
  863.       printf("  frag prog %u\n",
  864.              shProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program->Id);
  865.    if (shProg->_LinkedShaders[MESA_SHADER_GEOMETRY])
  866.       printf("  geom prog %u\n",
  867.              shProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program->Id);
  868. }
  869.  
  870.  
  871. /**
  872.  * Use the named shader program for subsequent glUniform calls
  873.  */
  874. void
  875. _mesa_active_program(struct gl_context *ctx, struct gl_shader_program *shProg,
  876.                      const char *caller)
  877. {
  878.    if ((shProg != NULL) && !shProg->LinkStatus) {
  879.       _mesa_error(ctx, GL_INVALID_OPERATION,
  880.                   "%s(program %u not linked)", caller, shProg->Name);
  881.       return;
  882.    }
  883.  
  884.    if (ctx->Shader.ActiveProgram != shProg) {
  885.       _mesa_reference_shader_program(ctx, &ctx->Shader.ActiveProgram, shProg);
  886.    }
  887. }
  888.  
  889. /**
  890.  */
  891. static bool
  892. use_shader_program(struct gl_context *ctx, GLenum type,
  893.                    struct gl_shader_program *shProg)
  894. {
  895.    struct gl_shader_program **target;
  896.  
  897.    switch (type) {
  898.    case GL_VERTEX_SHADER:
  899.       target = &ctx->Shader.CurrentVertexProgram;
  900.       if ((shProg == NULL)
  901.           || (shProg->_LinkedShaders[MESA_SHADER_VERTEX] == NULL)) {
  902.          shProg = NULL;
  903.       }
  904.       break;
  905.    case GL_GEOMETRY_SHADER_ARB:
  906.       target = &ctx->Shader.CurrentGeometryProgram;
  907.       if ((shProg == NULL)
  908.           || (shProg->_LinkedShaders[MESA_SHADER_GEOMETRY] == NULL)) {
  909.          shProg = NULL;
  910.       }
  911.       break;
  912.    case GL_FRAGMENT_SHADER:
  913.       target = &ctx->Shader.CurrentFragmentProgram;
  914.       if ((shProg == NULL)
  915.           || (shProg->_LinkedShaders[MESA_SHADER_FRAGMENT] == NULL)) {
  916.          shProg = NULL;
  917.       }
  918.       break;
  919.    default:
  920.       return false;
  921.    }
  922.  
  923.    if (*target != shProg) {
  924.       FLUSH_VERTICES(ctx, _NEW_PROGRAM | _NEW_PROGRAM_CONSTANTS);
  925.  
  926.       /* If the shader is also bound as the current rendering shader, unbind
  927.        * it from that binding point as well.  This ensures that the correct
  928.        * semantics of glDeleteProgram are maintained.
  929.        */
  930.       switch (type) {
  931.       case GL_VERTEX_SHADER:
  932.          /* Empty for now. */
  933.          break;
  934.       case GL_GEOMETRY_SHADER_ARB:
  935.          /* Empty for now. */
  936.          break;
  937.       case GL_FRAGMENT_SHADER:
  938.          if (*target == ctx->Shader._CurrentFragmentProgram) {
  939.             _mesa_reference_shader_program(ctx,
  940.                                            &ctx->Shader._CurrentFragmentProgram,
  941.                                            NULL);
  942.          }
  943.          break;
  944.       }
  945.  
  946.       _mesa_reference_shader_program(ctx, target, shProg);
  947.       return true;
  948.    }
  949.  
  950.    return false;
  951. }
  952.  
  953. /**
  954.  * Use the named shader program for subsequent rendering.
  955.  */
  956. void
  957. _mesa_use_program(struct gl_context *ctx, struct gl_shader_program *shProg)
  958. {
  959.    use_shader_program(ctx, GL_VERTEX_SHADER, shProg);
  960.    use_shader_program(ctx, GL_GEOMETRY_SHADER_ARB, shProg);
  961.    use_shader_program(ctx, GL_FRAGMENT_SHADER, shProg);
  962.    _mesa_active_program(ctx, shProg, "glUseProgram");
  963.  
  964.    if (ctx->Driver.UseProgram)
  965.       ctx->Driver.UseProgram(ctx, shProg);
  966. }
  967.  
  968.  
  969. /**
  970.  * Do validation of the given shader program.
  971.  * \param errMsg  returns error message if validation fails.
  972.  * \return GL_TRUE if valid, GL_FALSE if invalid (and set errMsg)
  973.  */
  974. static GLboolean
  975. validate_shader_program(const struct gl_shader_program *shProg,
  976.                         char *errMsg)
  977. {
  978.    if (!shProg->LinkStatus) {
  979.       return GL_FALSE;
  980.    }
  981.  
  982.    /* From the GL spec, a program is invalid if any of these are true:
  983.  
  984.      any two active samplers in the current program object are of
  985.      different types, but refer to the same texture image unit,
  986.  
  987.      any active sampler in the current program object refers to a texture
  988.      image unit where fixed-function fragment processing accesses a
  989.      texture target that does not match the sampler type, or
  990.  
  991.      the sum of the number of active samplers in the program and the
  992.      number of texture image units enabled for fixed-function fragment
  993.      processing exceeds the combined limit on the total number of texture
  994.      image units allowed.
  995.    */
  996.  
  997.  
  998.    /*
  999.     * Check: any two active samplers in the current program object are of
  1000.     * different types, but refer to the same texture image unit,
  1001.     */
  1002.    if (!_mesa_sampler_uniforms_are_valid(shProg, errMsg, 100))
  1003.       return GL_FALSE;
  1004.  
  1005.    return GL_TRUE;
  1006. }
  1007.  
  1008.  
  1009. /**
  1010.  * Called via glValidateProgram()
  1011.  */
  1012. static void
  1013. validate_program(struct gl_context *ctx, GLuint program)
  1014. {
  1015.    struct gl_shader_program *shProg;
  1016.    char errMsg[100] = "";
  1017.  
  1018.    shProg = _mesa_lookup_shader_program_err(ctx, program, "glValidateProgram");
  1019.    if (!shProg) {
  1020.       return;
  1021.    }
  1022.  
  1023.    shProg->Validated = validate_shader_program(shProg, errMsg);
  1024.    if (!shProg->Validated) {
  1025.       /* update info log */
  1026.       if (shProg->InfoLog) {
  1027.          ralloc_free(shProg->InfoLog);
  1028.       }
  1029.       shProg->InfoLog = ralloc_strdup(shProg, errMsg);
  1030.    }
  1031. }
  1032.  
  1033.  
  1034.  
  1035. void GLAPIENTRY
  1036. _mesa_AttachObjectARB(GLhandleARB program, GLhandleARB shader)
  1037. {
  1038.    GET_CURRENT_CONTEXT(ctx);
  1039.    attach_shader(ctx, program, shader);
  1040. }
  1041.  
  1042.  
  1043. void GLAPIENTRY
  1044. _mesa_AttachShader(GLuint program, GLuint shader)
  1045. {
  1046.    GET_CURRENT_CONTEXT(ctx);
  1047.    attach_shader(ctx, program, shader);
  1048. }
  1049.  
  1050.  
  1051. void GLAPIENTRY
  1052. _mesa_CompileShader(GLhandleARB shaderObj)
  1053. {
  1054.    GET_CURRENT_CONTEXT(ctx);
  1055.    if (MESA_VERBOSE & VERBOSE_API)
  1056.       _mesa_debug(ctx, "glCompileShader %u\n", shaderObj);
  1057.    compile_shader(ctx, shaderObj);
  1058. }
  1059.  
  1060.  
  1061. GLuint GLAPIENTRY
  1062. _mesa_CreateShader(GLenum type)
  1063. {
  1064.    GET_CURRENT_CONTEXT(ctx);
  1065.    if (MESA_VERBOSE & VERBOSE_API)
  1066.       _mesa_debug(ctx, "glCreateShader %s\n", _mesa_lookup_enum_by_nr(type));
  1067.    return create_shader(ctx, type);
  1068. }
  1069.  
  1070.  
  1071. GLhandleARB GLAPIENTRY
  1072. _mesa_CreateShaderObjectARB(GLenum type)
  1073. {
  1074.    GET_CURRENT_CONTEXT(ctx);
  1075.    return create_shader(ctx, type);
  1076. }
  1077.  
  1078.  
  1079. GLuint GLAPIENTRY
  1080. _mesa_CreateProgram(void)
  1081. {
  1082.    GET_CURRENT_CONTEXT(ctx);
  1083.    if (MESA_VERBOSE & VERBOSE_API)
  1084.       _mesa_debug(ctx, "glCreateProgram\n");
  1085.    return create_shader_program(ctx);
  1086. }
  1087.  
  1088.  
  1089. GLhandleARB GLAPIENTRY
  1090. _mesa_CreateProgramObjectARB(void)
  1091. {
  1092.    GET_CURRENT_CONTEXT(ctx);
  1093.    return create_shader_program(ctx);
  1094. }
  1095.  
  1096.  
  1097. void GLAPIENTRY
  1098. _mesa_DeleteObjectARB(GLhandleARB obj)
  1099. {
  1100.    if (MESA_VERBOSE & VERBOSE_API) {
  1101.       GET_CURRENT_CONTEXT(ctx);
  1102.       _mesa_debug(ctx, "glDeleteObjectARB(%u)\n", obj);
  1103.    }
  1104.  
  1105.    if (obj) {
  1106.       GET_CURRENT_CONTEXT(ctx);
  1107.       FLUSH_VERTICES(ctx, 0);
  1108.       if (is_program(ctx, obj)) {
  1109.          delete_shader_program(ctx, obj);
  1110.       }
  1111.       else if (is_shader(ctx, obj)) {
  1112.          delete_shader(ctx, obj);
  1113.       }
  1114.       else {
  1115.          /* error? */
  1116.       }
  1117.    }
  1118. }
  1119.  
  1120.  
  1121. void GLAPIENTRY
  1122. _mesa_DeleteProgram(GLuint name)
  1123. {
  1124.    if (name) {
  1125.       GET_CURRENT_CONTEXT(ctx);
  1126.       FLUSH_VERTICES(ctx, 0);
  1127.       delete_shader_program(ctx, name);
  1128.    }
  1129. }
  1130.  
  1131.  
  1132. void GLAPIENTRY
  1133. _mesa_DeleteShader(GLuint name)
  1134. {
  1135.    if (name) {
  1136.       GET_CURRENT_CONTEXT(ctx);
  1137.       FLUSH_VERTICES(ctx, 0);
  1138.       delete_shader(ctx, name);
  1139.    }
  1140. }
  1141.  
  1142.  
  1143. void GLAPIENTRY
  1144. _mesa_DetachObjectARB(GLhandleARB program, GLhandleARB shader)
  1145. {
  1146.    GET_CURRENT_CONTEXT(ctx);
  1147.    detach_shader(ctx, program, shader);
  1148. }
  1149.  
  1150.  
  1151. void GLAPIENTRY
  1152. _mesa_DetachShader(GLuint program, GLuint shader)
  1153. {
  1154.    GET_CURRENT_CONTEXT(ctx);
  1155.    detach_shader(ctx, program, shader);
  1156. }
  1157.  
  1158.  
  1159. void GLAPIENTRY
  1160. _mesa_GetAttachedObjectsARB(GLhandleARB container, GLsizei maxCount,
  1161.                             GLsizei * count, GLhandleARB * obj)
  1162. {
  1163.    GET_CURRENT_CONTEXT(ctx);
  1164.    get_attached_shaders(ctx, container, maxCount, count, obj);
  1165. }
  1166.  
  1167.  
  1168. void GLAPIENTRY
  1169. _mesa_GetAttachedShaders(GLuint program, GLsizei maxCount,
  1170.                          GLsizei *count, GLuint *obj)
  1171. {
  1172.    GET_CURRENT_CONTEXT(ctx);
  1173.    get_attached_shaders(ctx, program, maxCount, count, obj);
  1174. }
  1175.  
  1176.  
  1177. void GLAPIENTRY
  1178. _mesa_GetInfoLogARB(GLhandleARB object, GLsizei maxLength, GLsizei * length,
  1179.                     GLcharARB * infoLog)
  1180. {
  1181.    GET_CURRENT_CONTEXT(ctx);
  1182.    if (is_program(ctx, object)) {
  1183.       get_program_info_log(ctx, object, maxLength, length, infoLog);
  1184.    }
  1185.    else if (is_shader(ctx, object)) {
  1186.       get_shader_info_log(ctx, object, maxLength, length, infoLog);
  1187.    }
  1188.    else {
  1189.       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetInfoLogARB");
  1190.    }
  1191. }
  1192.  
  1193.  
  1194. void GLAPIENTRY
  1195. _mesa_GetObjectParameterivARB(GLhandleARB object, GLenum pname, GLint *params)
  1196. {
  1197.    GET_CURRENT_CONTEXT(ctx);
  1198.    /* Implement in terms of GetProgramiv, GetShaderiv */
  1199.    if (is_program(ctx, object)) {
  1200.       if (pname == GL_OBJECT_TYPE_ARB) {
  1201.          *params = GL_PROGRAM_OBJECT_ARB;
  1202.       }
  1203.       else {
  1204.          get_programiv(ctx, object, pname, params);
  1205.       }
  1206.    }
  1207.    else if (is_shader(ctx, object)) {
  1208.       if (pname == GL_OBJECT_TYPE_ARB) {
  1209.          *params = GL_SHADER_OBJECT_ARB;
  1210.       }
  1211.       else {
  1212.          get_shaderiv(ctx, object, pname, params);
  1213.       }
  1214.    }
  1215.    else {
  1216.       _mesa_error(ctx, GL_INVALID_VALUE, "glGetObjectParameterivARB");
  1217.    }
  1218. }
  1219.  
  1220.  
  1221. void GLAPIENTRY
  1222. _mesa_GetObjectParameterfvARB(GLhandleARB object, GLenum pname,
  1223.                               GLfloat *params)
  1224. {
  1225.    GLint iparams[1];  /* XXX is one element enough? */
  1226.    _mesa_GetObjectParameterivARB(object, pname, iparams);
  1227.    params[0] = (GLfloat) iparams[0];
  1228. }
  1229.  
  1230.  
  1231. void GLAPIENTRY
  1232. _mesa_GetProgramiv(GLuint program, GLenum pname, GLint *params)
  1233. {
  1234.    GET_CURRENT_CONTEXT(ctx);
  1235.    get_programiv(ctx, program, pname, params);
  1236. }
  1237.  
  1238.  
  1239. void GLAPIENTRY
  1240. _mesa_GetShaderiv(GLuint shader, GLenum pname, GLint *params)
  1241. {
  1242.    GET_CURRENT_CONTEXT(ctx);
  1243.    get_shaderiv(ctx, shader, pname, params);
  1244. }
  1245.  
  1246.  
  1247. void GLAPIENTRY
  1248. _mesa_GetProgramInfoLog(GLuint program, GLsizei bufSize,
  1249.                         GLsizei *length, GLchar *infoLog)
  1250. {
  1251.    GET_CURRENT_CONTEXT(ctx);
  1252.    get_program_info_log(ctx, program, bufSize, length, infoLog);
  1253. }
  1254.  
  1255.  
  1256. void GLAPIENTRY
  1257. _mesa_GetShaderInfoLog(GLuint shader, GLsizei bufSize,
  1258.                        GLsizei *length, GLchar *infoLog)
  1259. {
  1260.    GET_CURRENT_CONTEXT(ctx);
  1261.    get_shader_info_log(ctx, shader, bufSize, length, infoLog);
  1262. }
  1263.  
  1264.  
  1265. void GLAPIENTRY
  1266. _mesa_GetShaderSource(GLhandleARB shader, GLsizei maxLength,
  1267.                          GLsizei *length, GLcharARB *sourceOut)
  1268. {
  1269.    GET_CURRENT_CONTEXT(ctx);
  1270.    get_shader_source(ctx, shader, maxLength, length, sourceOut);
  1271. }
  1272.  
  1273.  
  1274. GLhandleARB GLAPIENTRY
  1275. _mesa_GetHandleARB(GLenum pname)
  1276. {
  1277.    GET_CURRENT_CONTEXT(ctx);
  1278.    return get_handle(ctx, pname);
  1279. }
  1280.  
  1281.  
  1282. GLboolean GLAPIENTRY
  1283. _mesa_IsProgram(GLuint name)
  1284. {
  1285.    GET_CURRENT_CONTEXT(ctx);
  1286.    return is_program(ctx, name);
  1287. }
  1288.  
  1289.  
  1290. GLboolean GLAPIENTRY
  1291. _mesa_IsShader(GLuint name)
  1292. {
  1293.    GET_CURRENT_CONTEXT(ctx);
  1294.    return is_shader(ctx, name);
  1295. }
  1296.  
  1297.  
  1298. void GLAPIENTRY
  1299. _mesa_LinkProgram(GLhandleARB programObj)
  1300. {
  1301.    GET_CURRENT_CONTEXT(ctx);
  1302.    link_program(ctx, programObj);
  1303. }
  1304.  
  1305.  
  1306.  
  1307. /**
  1308.  * Read shader source code from a file.
  1309.  * Useful for debugging to override an app's shader.
  1310.  */
  1311. static GLcharARB *
  1312. read_shader(const char *fname)
  1313. {
  1314.    const int max = 50*1000;
  1315.    FILE *f = fopen(fname, "r");
  1316.    GLcharARB *buffer, *shader;
  1317.    int len;
  1318.  
  1319.    if (!f) {
  1320.       return NULL;
  1321.    }
  1322.  
  1323.    buffer = malloc(max);
  1324.    len = fread(buffer, 1, max, f);
  1325.    buffer[len] = 0;
  1326.  
  1327.    fclose(f);
  1328.  
  1329.    shader = _mesa_strdup(buffer);
  1330.    free(buffer);
  1331.  
  1332.    return shader;
  1333. }
  1334.  
  1335.  
  1336. /**
  1337.  * Called via glShaderSource() and glShaderSourceARB() API functions.
  1338.  * Basically, concatenate the source code strings into one long string
  1339.  * and pass it to _mesa_shader_source().
  1340.  */
  1341. void GLAPIENTRY
  1342. _mesa_ShaderSource(GLhandleARB shaderObj, GLsizei count,
  1343.                       const GLcharARB * const * string, const GLint * length)
  1344. {
  1345.    GET_CURRENT_CONTEXT(ctx);
  1346.    GLint *offsets;
  1347.    GLsizei i, totalLength;
  1348.    GLcharARB *source;
  1349.    GLuint checksum;
  1350.  
  1351.    if (!shaderObj || string == NULL) {
  1352.       _mesa_error(ctx, GL_INVALID_VALUE, "glShaderSourceARB");
  1353.       return;
  1354.    }
  1355.  
  1356.    /*
  1357.     * This array holds offsets of where the appropriate string ends, thus the
  1358.     * last element will be set to the total length of the source code.
  1359.     */
  1360.    offsets = malloc(count * sizeof(GLint));
  1361.    if (offsets == NULL) {
  1362.       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glShaderSourceARB");
  1363.       return;
  1364.    }
  1365.  
  1366.    for (i = 0; i < count; i++) {
  1367.       if (string[i] == NULL) {
  1368.          free((GLvoid *) offsets);
  1369.          _mesa_error(ctx, GL_INVALID_OPERATION,
  1370.                      "glShaderSourceARB(null string)");
  1371.          return;
  1372.       }
  1373.       if (length == NULL || length[i] < 0)
  1374.          offsets[i] = strlen(string[i]);
  1375.       else
  1376.          offsets[i] = length[i];
  1377.       /* accumulate string lengths */
  1378.       if (i > 0)
  1379.          offsets[i] += offsets[i - 1];
  1380.    }
  1381.  
  1382.    /* Total length of source string is sum off all strings plus two.
  1383.     * One extra byte for terminating zero, another extra byte to silence
  1384.     * valgrind warnings in the parser/grammer code.
  1385.     */
  1386.    totalLength = offsets[count - 1] + 2;
  1387.    source = malloc(totalLength * sizeof(GLcharARB));
  1388.    if (source == NULL) {
  1389.       free((GLvoid *) offsets);
  1390.       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glShaderSourceARB");
  1391.       return;
  1392.    }
  1393.  
  1394.    for (i = 0; i < count; i++) {
  1395.       GLint start = (i > 0) ? offsets[i - 1] : 0;
  1396.       memcpy(source + start, string[i],
  1397.              (offsets[i] - start) * sizeof(GLcharARB));
  1398.    }
  1399.    source[totalLength - 1] = '\0';
  1400.    source[totalLength - 2] = '\0';
  1401.  
  1402.    if (SHADER_SUBST) {
  1403.       /* Compute the shader's source code checksum then try to open a file
  1404.        * named newshader_<CHECKSUM>.  If it exists, use it in place of the
  1405.        * original shader source code.  For debugging.
  1406.        */
  1407.       char filename[100];
  1408.       GLcharARB *newSource;
  1409.  
  1410.       checksum = _mesa_str_checksum(source);
  1411.  
  1412.       _mesa_snprintf(filename, sizeof(filename), "newshader_%d", checksum);
  1413.  
  1414.       newSource = read_shader(filename);
  1415.       if (newSource) {
  1416.          fprintf(stderr, "Mesa: Replacing shader %u chksum=%d with %s\n",
  1417.                        shaderObj, checksum, filename);
  1418.          free(source);
  1419.          source = newSource;
  1420.       }
  1421.    }
  1422.  
  1423.    shader_source(ctx, shaderObj, source);
  1424.  
  1425.    if (SHADER_SUBST) {
  1426.       struct gl_shader *sh = _mesa_lookup_shader(ctx, shaderObj);
  1427.       if (sh)
  1428.          sh->SourceChecksum = checksum; /* save original checksum */
  1429.    }
  1430.  
  1431.    free(offsets);
  1432. }
  1433.  
  1434.  
  1435. void GLAPIENTRY
  1436. _mesa_UseProgram(GLhandleARB program)
  1437. {
  1438.    GET_CURRENT_CONTEXT(ctx);
  1439.    struct gl_shader_program *shProg;
  1440.  
  1441.    if (_mesa_is_xfb_active_and_unpaused(ctx)) {
  1442.       _mesa_error(ctx, GL_INVALID_OPERATION,
  1443.                   "glUseProgram(transform feedback active)");
  1444.       return;
  1445.    }
  1446.  
  1447.    if (program) {
  1448.       shProg = _mesa_lookup_shader_program_err(ctx, program, "glUseProgram");
  1449.       if (!shProg) {
  1450.          return;
  1451.       }
  1452.       if (!shProg->LinkStatus) {
  1453.          _mesa_error(ctx, GL_INVALID_OPERATION,
  1454.                      "glUseProgram(program %u not linked)", program);
  1455.          return;
  1456.       }
  1457.  
  1458.       /* debug code */
  1459.       if (ctx->Shader.Flags & GLSL_USE_PROG) {
  1460.          print_shader_info(shProg);
  1461.       }
  1462.    }
  1463.    else {
  1464.       shProg = NULL;
  1465.    }
  1466.  
  1467.    _mesa_use_program(ctx, shProg);
  1468. }
  1469.  
  1470.  
  1471. void GLAPIENTRY
  1472. _mesa_ValidateProgram(GLhandleARB program)
  1473. {
  1474.    GET_CURRENT_CONTEXT(ctx);
  1475.    validate_program(ctx, program);
  1476. }
  1477.  
  1478.  
  1479. /**
  1480.  * For OpenGL ES 2.0, GL_ARB_ES2_compatibility
  1481.  */
  1482. void GLAPIENTRY
  1483. _mesa_GetShaderPrecisionFormat(GLenum shadertype, GLenum precisiontype,
  1484.                                GLint* range, GLint* precision)
  1485. {
  1486.    const struct gl_program_constants *limits;
  1487.    const struct gl_precision *p;
  1488.    GET_CURRENT_CONTEXT(ctx);
  1489.  
  1490.    switch (shadertype) {
  1491.    case GL_VERTEX_SHADER:
  1492.       limits = &ctx->Const.VertexProgram;
  1493.       break;
  1494.    case GL_FRAGMENT_SHADER:
  1495.       limits = &ctx->Const.FragmentProgram;
  1496.       break;
  1497.    default:
  1498.       _mesa_error(ctx, GL_INVALID_ENUM,
  1499.                   "glGetShaderPrecisionFormat(shadertype)");
  1500.       return;
  1501.    }
  1502.  
  1503.    switch (precisiontype) {
  1504.    case GL_LOW_FLOAT:
  1505.       p = &limits->LowFloat;
  1506.       break;
  1507.    case GL_MEDIUM_FLOAT:
  1508.       p = &limits->MediumFloat;
  1509.       break;
  1510.    case GL_HIGH_FLOAT:
  1511.       p = &limits->HighFloat;
  1512.       break;
  1513.    case GL_LOW_INT:
  1514.       p = &limits->LowInt;
  1515.       break;
  1516.    case GL_MEDIUM_INT:
  1517.       p = &limits->MediumInt;
  1518.       break;
  1519.    case GL_HIGH_INT:
  1520.       p = &limits->HighInt;
  1521.       break;
  1522.    default:
  1523.       _mesa_error(ctx, GL_INVALID_ENUM,
  1524.                   "glGetShaderPrecisionFormat(precisiontype)");
  1525.       return;
  1526.    }
  1527.  
  1528.    range[0] = p->RangeMin;
  1529.    range[1] = p->RangeMax;
  1530.    precision[0] = p->Precision;
  1531. }
  1532.  
  1533.  
  1534. /**
  1535.  * For OpenGL ES 2.0, GL_ARB_ES2_compatibility
  1536.  */
  1537. void GLAPIENTRY
  1538. _mesa_ReleaseShaderCompiler(void)
  1539. {
  1540.    _mesa_destroy_shader_compiler_caches();
  1541. }
  1542.  
  1543.  
  1544. /**
  1545.  * For OpenGL ES 2.0, GL_ARB_ES2_compatibility
  1546.  */
  1547. void GLAPIENTRY
  1548. _mesa_ShaderBinary(GLint n, const GLuint* shaders, GLenum binaryformat,
  1549.                    const void* binary, GLint length)
  1550. {
  1551.    GET_CURRENT_CONTEXT(ctx);
  1552.    (void) n;
  1553.    (void) shaders;
  1554.    (void) binaryformat;
  1555.    (void) binary;
  1556.    (void) length;
  1557.    _mesa_error(ctx, GL_INVALID_OPERATION, __FUNCTION__);
  1558. }
  1559.  
  1560.  
  1561. void GLAPIENTRY
  1562. _mesa_GetProgramBinary(GLuint program, GLsizei bufSize, GLsizei *length,
  1563.                        GLenum *binaryFormat, GLvoid *binary)
  1564. {
  1565.    struct gl_shader_program *shProg;
  1566.    GET_CURRENT_CONTEXT(ctx);
  1567.  
  1568.    shProg = _mesa_lookup_shader_program_err(ctx, program, "glGetProgramBinary");
  1569.    if (!shProg)
  1570.       return;
  1571.  
  1572.    if (!shProg->LinkStatus) {
  1573.       _mesa_error(ctx, GL_INVALID_OPERATION,
  1574.                   "glGetProgramBinary(program %u not linked)",
  1575.                   shProg->Name);
  1576.       return;
  1577.    }
  1578.  
  1579.    if (bufSize < 0){
  1580.       _mesa_error(ctx, GL_INVALID_VALUE, "glGetProgramBinary(bufSize < 0)");
  1581.       return;
  1582.    }
  1583.  
  1584.    /* The ARB_get_program_binary spec says:
  1585.     *
  1586.     *     "If <length> is NULL, then no length is returned."
  1587.     */
  1588.    if (length != NULL)
  1589.       *length = 0;
  1590.  
  1591.    (void) binaryFormat;
  1592.    (void) binary;
  1593. }
  1594.  
  1595. void GLAPIENTRY
  1596. _mesa_ProgramBinary(GLuint program, GLenum binaryFormat,
  1597.                     const GLvoid *binary, GLsizei length)
  1598. {
  1599.    struct gl_shader_program *shProg;
  1600.    GET_CURRENT_CONTEXT(ctx);
  1601.  
  1602.    shProg = _mesa_lookup_shader_program_err(ctx, program, "glProgramBinary");
  1603.    if (!shProg)
  1604.       return;
  1605.  
  1606.    (void) binaryFormat;
  1607.    (void) binary;
  1608.    (void) length;
  1609.    _mesa_error(ctx, GL_INVALID_OPERATION, __FUNCTION__);
  1610. }
  1611.  
  1612.  
  1613. void GLAPIENTRY
  1614. _mesa_ProgramParameteri(GLuint program, GLenum pname, GLint value)
  1615. {
  1616.    struct gl_shader_program *shProg;
  1617.    GET_CURRENT_CONTEXT(ctx);
  1618.  
  1619.    shProg = _mesa_lookup_shader_program_err(ctx, program,
  1620.                                             "glProgramParameteri");
  1621.    if (!shProg)
  1622.       return;
  1623.  
  1624.    switch (pname) {
  1625.    case GL_GEOMETRY_VERTICES_OUT_ARB:
  1626.       if (!_mesa_is_desktop_gl(ctx) || !ctx->Extensions.ARB_geometry_shader4)
  1627.          break;
  1628.  
  1629.       if (value < 1 ||
  1630.           (unsigned) value > ctx->Const.MaxGeometryOutputVertices) {
  1631.          _mesa_error(ctx, GL_INVALID_VALUE,
  1632.                      "glProgramParameteri(GL_GEOMETRY_VERTICES_OUT_ARB=%d",
  1633.                      value);
  1634.          return;
  1635.       }
  1636.       shProg->Geom.VerticesOut = value;
  1637.       return;
  1638.    case GL_GEOMETRY_INPUT_TYPE_ARB:
  1639.       if (!_mesa_is_desktop_gl(ctx) || !ctx->Extensions.ARB_geometry_shader4)
  1640.          break;
  1641.  
  1642.       switch (value) {
  1643.       case GL_POINTS:
  1644.       case GL_LINES:
  1645.       case GL_LINES_ADJACENCY_ARB:
  1646.       case GL_TRIANGLES:
  1647.       case GL_TRIANGLES_ADJACENCY_ARB:
  1648.          shProg->Geom.InputType = value;
  1649.          break;
  1650.       default:
  1651.          _mesa_error(ctx, GL_INVALID_VALUE,
  1652.                      "glProgramParameteri(geometry input type = %s",
  1653.                      _mesa_lookup_enum_by_nr(value));
  1654.          return;
  1655.       }
  1656.       return;
  1657.    case GL_GEOMETRY_OUTPUT_TYPE_ARB:
  1658.       if (!_mesa_is_desktop_gl(ctx) || !ctx->Extensions.ARB_geometry_shader4)
  1659.          break;
  1660.  
  1661.       switch (value) {
  1662.       case GL_POINTS:
  1663.       case GL_LINE_STRIP:
  1664.       case GL_TRIANGLE_STRIP:
  1665.          shProg->Geom.OutputType = value;
  1666.          break;
  1667.       default:
  1668.          _mesa_error(ctx, GL_INVALID_VALUE,
  1669.                      "glProgramParameteri(geometry output type = %s",
  1670.                      _mesa_lookup_enum_by_nr(value));
  1671.          return;
  1672.       }
  1673.       return;
  1674.    case GL_PROGRAM_BINARY_RETRIEVABLE_HINT:
  1675.       /* This enum isn't part of the OES extension for OpenGL ES 2.0, but it
  1676.        * is part of OpenGL ES 3.0.  For the ES2 case, this function shouldn't
  1677.        * even be in the dispatch table, so we shouldn't need to expclicitly
  1678.        * check here.
  1679.        *
  1680.        * On desktop, we ignore the 3.0+ requirement because it is silly.
  1681.        */
  1682.  
  1683.       /* The ARB_get_program_binary extension spec says:
  1684.        *
  1685.        *     "An INVALID_VALUE error is generated if the <value> argument to
  1686.        *     ProgramParameteri is not TRUE or FALSE."
  1687.        */
  1688.       if (value != GL_TRUE && value != GL_FALSE) {
  1689.          _mesa_error(ctx, GL_INVALID_VALUE,
  1690.                      "glProgramParameteri(pname=%s, value=%d): "
  1691.                      "value must be 0 or 1.",
  1692.                      _mesa_lookup_enum_by_nr(pname),
  1693.                      value);
  1694.          return;
  1695.       }
  1696.  
  1697.       /* No need to notify the driver.  Any changes will actually take effect
  1698.        * the next time the shader is linked.
  1699.        *
  1700.        * The ARB_get_program_binary extension spec says:
  1701.        *
  1702.        *     "To indicate that a program binary is likely to be retrieved,
  1703.        *     ProgramParameteri should be called with <pname>
  1704.        *     PROGRAM_BINARY_RETRIEVABLE_HINT and <value> TRUE. This setting
  1705.        *     will not be in effect until the next time LinkProgram or
  1706.        *     ProgramBinary has been called successfully."
  1707.        *
  1708.        * The resloution of issue 9 in the extension spec also says:
  1709.        *
  1710.        *     "The application may use the PROGRAM_BINARY_RETRIEVABLE_HINT hint
  1711.        *     to indicate to the GL implementation that this program will
  1712.        *     likely be saved with GetProgramBinary at some point. This will
  1713.        *     give the GL implementation the opportunity to track any state
  1714.        *     changes made to the program before being saved such that when it
  1715.        *     is loaded again a recompile can be avoided."
  1716.        */
  1717.       shProg->BinaryRetreivableHint = value;
  1718.       return;
  1719.    default:
  1720.       break;
  1721.    }
  1722.  
  1723.    _mesa_error(ctx, GL_INVALID_ENUM, "glProgramParameteri(pname=%s)",
  1724.                _mesa_lookup_enum_by_nr(pname));
  1725. }
  1726.  
  1727. void
  1728. _mesa_use_shader_program(struct gl_context *ctx, GLenum type,
  1729.                          struct gl_shader_program *shProg)
  1730. {
  1731.    use_shader_program(ctx, type, shProg);
  1732.  
  1733.    if (ctx->Driver.UseProgram)
  1734.       ctx->Driver.UseProgram(ctx, shProg);
  1735. }
  1736.  
  1737.  
  1738. /**
  1739.  * For GL_EXT_separate_shader_objects
  1740.  */
  1741. void GLAPIENTRY
  1742. _mesa_UseShaderProgramEXT(GLenum type, GLuint program)
  1743. {
  1744.    GET_CURRENT_CONTEXT(ctx);
  1745.    struct gl_shader_program *shProg = NULL;
  1746.  
  1747.    if (!validate_shader_target(ctx, type)) {
  1748.       _mesa_error(ctx, GL_INVALID_ENUM, "glUseShaderProgramEXT(type)");
  1749.       return;
  1750.    }
  1751.  
  1752.    if (_mesa_is_xfb_active_and_unpaused(ctx)) {
  1753.       _mesa_error(ctx, GL_INVALID_OPERATION,
  1754.                   "glUseShaderProgramEXT(transform feedback is active)");
  1755.       return;
  1756.    }
  1757.  
  1758.    if (program) {
  1759.       shProg = _mesa_lookup_shader_program_err(ctx, program,
  1760.                                                "glUseShaderProgramEXT");
  1761.       if (shProg == NULL)
  1762.          return;
  1763.  
  1764.       if (!shProg->LinkStatus) {
  1765.          _mesa_error(ctx, GL_INVALID_OPERATION,
  1766.                      "glUseShaderProgramEXT(program not linked)");
  1767.          return;
  1768.       }
  1769.    }
  1770.  
  1771.    _mesa_use_shader_program(ctx, type, shProg);
  1772. }
  1773.  
  1774.  
  1775. /**
  1776.  * For GL_EXT_separate_shader_objects
  1777.  */
  1778. void GLAPIENTRY
  1779. _mesa_ActiveProgramEXT(GLuint program)
  1780. {
  1781.    GET_CURRENT_CONTEXT(ctx);
  1782.    struct gl_shader_program *shProg = (program != 0)
  1783.       ? _mesa_lookup_shader_program_err(ctx, program, "glActiveProgramEXT")
  1784.       : NULL;
  1785.  
  1786.    _mesa_active_program(ctx, shProg, "glActiveProgramEXT");
  1787.    return;
  1788. }
  1789.  
  1790.  
  1791. /**
  1792.  * For GL_EXT_separate_shader_objects
  1793.  */
  1794. GLuint GLAPIENTRY
  1795. _mesa_CreateShaderProgramEXT(GLenum type, const GLchar *string)
  1796. {
  1797.    GET_CURRENT_CONTEXT(ctx);
  1798.    const GLuint shader = create_shader(ctx, type);
  1799.    GLuint program = 0;
  1800.  
  1801.    if (shader) {
  1802.       shader_source(ctx, shader, _mesa_strdup(string));
  1803.       compile_shader(ctx, shader);
  1804.  
  1805.       program = create_shader_program(ctx);
  1806.       if (program) {
  1807.          struct gl_shader_program *shProg;
  1808.          struct gl_shader *sh;
  1809.          GLint compiled = GL_FALSE;
  1810.  
  1811.          shProg = _mesa_lookup_shader_program(ctx, program);
  1812.          sh = _mesa_lookup_shader(ctx, shader);
  1813.  
  1814.          get_shaderiv(ctx, shader, GL_COMPILE_STATUS, &compiled);
  1815.          if (compiled) {
  1816.             attach_shader(ctx, program, shader);
  1817.             link_program(ctx, program);
  1818.             detach_shader(ctx, program, shader);
  1819.  
  1820. #if 0
  1821.             /* Possibly... */
  1822.             if (active-user-defined-varyings-in-linked-program) {
  1823.                append-error-to-info-log;
  1824.                shProg->LinkStatus = GL_FALSE;
  1825.             }
  1826. #endif
  1827.          }
  1828.  
  1829.          ralloc_strcat(&shProg->InfoLog, sh->InfoLog);
  1830.       }
  1831.  
  1832.       delete_shader(ctx, shader);
  1833.    }
  1834.  
  1835.    return program;
  1836. }
  1837.