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/**************************************************************************

 *

 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.

 * Copyright (c) 2008 VMware, Inc.

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sub license, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.

 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR

 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

 **************************************************************************/

#include "main/imports.h"

#include "main/context.h"

#include "main/macros.h"

#include "pipe/p_context.h"

#include "pipe/p_defines.h"

#include "pipe/p_screen.h"

#include "st_context.h"

#include "st_extensions.h"

static int _min(int a, int b)

{

   return (a < b) ? a : b;

}

static float _maxf(float a, float b)

{

   return (a > b) ? a : b;

}

static int _clamp(int a, int min, int max)

{

   if (a < min)

      return min;

   else if (a > max)

      return max;

   else

      return a;

}

/**

 * Query driver to get implementation limits.

 * Note that we have to limit/clamp against Mesa's internal limits too.

 */

void st_init_limits(struct st_context *st)

{

   struct pipe_screen *screen = st->pipe->screen;

   struct gl_constants *c = &st->ctx->Const;

   gl_shader_type sh;

   c->MaxTextureLevels

      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),

            MAX_TEXTURE_LEVELS);

   c->Max3DTextureLevels

      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),

            MAX_3D_TEXTURE_LEVELS);

   c->MaxCubeTextureLevels

      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),

            MAX_CUBE_TEXTURE_LEVELS);

   c->MaxTextureRectSize

      = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);

   c->MaxTextureImageUnits

      = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS),

            MAX_TEXTURE_IMAGE_UNITS);

   c->MaxVertexTextureImageUnits

      = _min(screen->get_param(screen, PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS),

             MAX_VERTEX_TEXTURE_IMAGE_UNITS);

   c->MaxCombinedTextureImageUnits

      = _min(screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SAMPLERS),

             MAX_COMBINED_TEXTURE_IMAGE_UNITS);

   c->MaxTextureCoordUnits

      = _min(c->MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);

   c->MaxTextureUnits = _min(c->MaxTextureImageUnits, c->MaxTextureCoordUnits);

   c->MaxDrawBuffers

      = _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),

              1, MAX_DRAW_BUFFERS);

   c->MaxLineWidth

      = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH));

   c->MaxLineWidthAA

      = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH_AA));

   c->MaxPointSize

      = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH));

   c->MaxPointSizeAA

      = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH_AA));

   /* called after _mesa_create_context/_mesa_init_point, fix default user

    * settable max point size up

    */

   st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);

   /* these are not queryable. Note that GL basically mandates a 1.0 minimum

    * for non-aa sizes, but we can go down to 0.0 for aa points.

    */

   c->MinPointSize = 1.0f;

   c->MinPointSizeAA = 0.0f;

   c->MaxTextureMaxAnisotropy

      = _maxf(2.0f, screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_ANISOTROPY));

   c->MaxTextureLodBias

      = screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_LOD_BIAS);

   c->MaxDrawBuffers

      = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),

              1, MAX_DRAW_BUFFERS);

   /* Quads always follow GL provoking rules. */

   c->QuadsFollowProvokingVertexConvention = GL_FALSE;

   for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {

      struct gl_shader_compiler_options *options =

         &st->ctx->ShaderCompilerOptions[sh];

      struct gl_program_constants *pc;

      switch (sh) {

      case PIPE_SHADER_FRAGMENT:

         pc = &c->FragmentProgram;

         break;

      case PIPE_SHADER_VERTEX:

         pc = &c->VertexProgram;

         break;

      case PIPE_SHADER_GEOMETRY:

         pc = &c->GeometryProgram;

         break;

      default:

         assert(0);

         continue;

      }

      pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);

      pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);

      pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);

      pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);

      pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);

      pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);

      pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);

      pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);

      pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);

      options->EmitNoNoise = TRUE;

      /* TODO: make these more fine-grained if anyone needs it */

      options->EmitNoIfs = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);

      options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);

      options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);

      options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);

      options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);

      options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,

                                        PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);

      options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,

                                        PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);

      options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,

                                        PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);

      options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,

                                        PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);

      if(options->EmitNoLoops)

         options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);

   }

   /* PIPE_CAP_MAX_FS_INPUTS specifies the number of COLORn + GENERICn inputs

    * and is set in MaxNativeAttribs. It's always 2 colors + N generic

    * attributes. The GLSL compiler never uses COLORn for varyings, so we

    * subtract the 2 colors to get the maximum number of varyings (generic

    * attributes) supported by a driver. */

   c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_MAX_INPUTS) - 2;

   c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);

   /* XXX we'll need a better query here someday */

   if (screen->get_param(screen, PIPE_CAP_GLSL)) {

      c->GLSLVersion = 120;

   }

}

/**

 * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine

 * which GL extensions are supported.

 * Quite a few extensions are always supported because they are standard

 * features or can be built on top of other gallium features.

 * Some fine tuning may still be needed.

 */

void st_init_extensions(struct st_context *st)

{

   struct pipe_screen *screen = st->pipe->screen;

   struct gl_context *ctx = st->ctx;

   /*

    * Extensions that are supported by all Gallium drivers:

    */

   ctx->Extensions.ARB_copy_buffer = GL_TRUE;

   ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;

   ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;

   ctx->Extensions.ARB_fragment_program = GL_TRUE;

   ctx->Extensions.ARB_map_buffer_range = GL_TRUE;

   ctx->Extensions.ARB_multisample = GL_TRUE;

   ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */

   ctx->Extensions.ARB_texture_compression = GL_TRUE;

   ctx->Extensions.ARB_texture_cube_map = GL_TRUE;

   ctx->Extensions.ARB_texture_env_combine = GL_TRUE;

   ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;

   ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;

   ctx->Extensions.ARB_vertex_array_object = GL_TRUE;

   ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;

   ctx->Extensions.ARB_vertex_program = GL_TRUE;

   ctx->Extensions.ARB_window_pos = GL_TRUE;

   ctx->Extensions.EXT_blend_color = GL_TRUE;

   ctx->Extensions.EXT_blend_func_separate = GL_TRUE;

   ctx->Extensions.EXT_blend_logic_op = GL_TRUE;

   ctx->Extensions.EXT_blend_minmax = GL_TRUE;

   ctx->Extensions.EXT_blend_subtract = GL_TRUE;

   ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;

   ctx->Extensions.EXT_framebuffer_object = GL_TRUE;

   ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;

   ctx->Extensions.EXT_fog_coord = GL_TRUE;

   ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;

   ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;

   ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;

   ctx->Extensions.EXT_point_parameters = GL_TRUE;

   ctx->Extensions.EXT_provoking_vertex = GL_TRUE;

   ctx->Extensions.EXT_secondary_color = GL_TRUE;

   ctx->Extensions.EXT_stencil_wrap = GL_TRUE;

   ctx->Extensions.EXT_texture_env_add = GL_TRUE;

   ctx->Extensions.EXT_texture_env_combine = GL_TRUE;

   ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;

   ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;

   ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;

   ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;

   ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;

   ctx->Extensions.MESA_pack_invert = GL_TRUE;

   ctx->Extensions.NV_blend_square = GL_TRUE;

   ctx->Extensions.NV_texgen_reflection = GL_TRUE;

   ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;

   ctx->Extensions.NV_texture_rectangle = GL_TRUE;

#if 0

   /* possibly could support the following two */

   ctx->Extensions.NV_vertex_program = GL_TRUE;

   ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;

#endif

#if FEATURE_OES_EGL_image

   ctx->Extensions.OES_EGL_image = GL_TRUE;

#endif

#if FEATURE_OES_draw_texture

   ctx->Extensions.OES_draw_texture = GL_TRUE;

#endif

   ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;

   /*

    * Extensions that depend on the driver/hardware:

    */

   if (screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS) > 0) {

      ctx->Extensions.ARB_draw_buffers = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {

      ctx->Extensions.EXT_texture_swizzle = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_GLSL)) {

      ctx->Extensions.ARB_fragment_shader = GL_TRUE;

      ctx->Extensions.ARB_vertex_shader = GL_TRUE;

      ctx->Extensions.ARB_shader_objects = GL_TRUE;

      ctx->Extensions.ARB_shading_language_100 = GL_TRUE;

      ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;

      ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_REPEAT) > 0) {

      ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_BLEND_EQUATION_SEPARATE)) {

      ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_CLAMP) > 0) {

      ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;

      ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {

      ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS) > 1) {

      ctx->Extensions.ARB_multitexture = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {

      ctx->Extensions.ATI_separate_stencil = GL_TRUE;

      ctx->Extensions.EXT_stencil_two_side = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {

      ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {

      ctx->Extensions.ARB_point_sprite = GL_TRUE;

      /* GL_NV_point_sprite is not supported by gallium because we don't

       * support the GL_POINT_SPRITE_R_MODE_NV option.

       */

   }

   if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {

      ctx->Extensions.ARB_occlusion_query = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {

     ctx->Extensions.EXT_timer_query = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {

      ctx->Extensions.ARB_depth_texture = GL_TRUE;

      ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;

      ctx->Extensions.ARB_shadow = GL_TRUE;

      ctx->Extensions.EXT_shadow_funcs = GL_TRUE;

      /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/

   }

   /* GL_EXT_packed_depth_stencil requires both the ability to render to

    * a depth/stencil buffer and texture from depth/stencil source.

    */

   if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,

                                   PIPE_TEXTURE_2D, 0,

                                   PIPE_BIND_DEPTH_STENCIL, 0) &&

       screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,

                                   PIPE_TEXTURE_2D, 0,

                                   PIPE_BIND_SAMPLER_VIEW, 0)) {

      ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;

   }

   else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,

                                        PIPE_TEXTURE_2D, 0,

                                        PIPE_BIND_DEPTH_STENCIL, 0) &&

            screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,

                                        PIPE_TEXTURE_2D, 0,

                                        PIPE_BIND_SAMPLER_VIEW, 0)) {

      ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;

   }

   /* sRGB support */

   if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,

                                   PIPE_TEXTURE_2D, 0,

                                   PIPE_BIND_SAMPLER_VIEW, 0) ||

      screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,

                                   PIPE_TEXTURE_2D, 0,

                                   PIPE_BIND_SAMPLER_VIEW, 0)) {

      ctx->Extensions.EXT_texture_sRGB = GL_TRUE;

   }

   if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,

                                   PIPE_TEXTURE_2D, 0,

                                   PIPE_BIND_SAMPLER_VIEW, 0)) {

      ctx->Extensions.ARB_texture_rg = GL_TRUE;

   }

   /* s3tc support */

   if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,

                                   PIPE_TEXTURE_2D, 0,

                                   PIPE_BIND_SAMPLER_VIEW, 0) &&

       (ctx->Mesa_DXTn ||

        screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,

                                    PIPE_TEXTURE_2D, 0,

                                    PIPE_BIND_RENDER_TARGET, 0))) {

      ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;

      ctx->Extensions.S3_s3tc = GL_TRUE;

   }

   /* ycbcr support */

   if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,

                                   PIPE_TEXTURE_2D, 0,

                                   PIPE_BIND_SAMPLER_VIEW, 0) ||

       screen->is_format_supported(screen, PIPE_FORMAT_YUYV,

                                   PIPE_TEXTURE_2D, 0,

                                   PIPE_BIND_SAMPLER_VIEW, 0)) {

      ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;

   }

   /* GL_ARB_framebuffer_object */

   if (ctx->Extensions.EXT_packed_depth_stencil) {

      /* we support always support GL_EXT_framebuffer_blit */

      ctx->Extensions.ARB_framebuffer_object = GL_TRUE;

   }

   if (st->pipe->render_condition) {

      ctx->Extensions.NV_conditional_render = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {

      ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;

   }

   /* GL_ARB_half_float_vertex */

   if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,

                                   PIPE_BUFFER, 0,

                                   PIPE_BIND_VERTEX_BUFFER, 0)) {

      ctx->Extensions.ARB_half_float_vertex = GL_TRUE;

   }

#if 0 /* not yet */

   if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {

      ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;

   }

#endif

   if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY, PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {

#if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */

      ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;

#endif

   }

   if (screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {

      ctx->Extensions.NV_primitive_restart = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_DEPTH_CLAMP)) {

      ctx->Extensions.ARB_depth_clamp = GL_TRUE;

   }

   if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {

      ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;

   }

}