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  1. /*
  2.  * Copyright (C) 2005-2007  Brian Paul   All Rights Reserved.
  3.  * Copyright (C) 2008  VMware, Inc.   All Rights Reserved.
  4.  * Copyright © 2010 Intel Corporation
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the "Software"),
  8.  * to deal in the Software without restriction, including without limitation
  9.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10.  * and/or sell copies of the Software, and to permit persons to whom the
  11.  * Software is furnished to do so, subject to the following conditions:
  12.  *
  13.  * The above copyright notice and this permission notice (including the next
  14.  * paragraph) shall be included in all copies or substantial portions of the
  15.  * Software.
  16.  *
  17.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18.  * 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 OTHER
  21.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23.  * DEALINGS IN THE SOFTWARE.
  24.  */
  25.  
  26. #include "ir.h"
  27. #include "glsl_types.h"
  28. #include "ir_visitor.h"
  29. #include "../glsl/program.h"
  30. #include "program/hash_table.h"
  31. #include "ir_uniform.h"
  32.  
  33. extern "C" {
  34. #include "main/compiler.h"
  35. #include "main/mtypes.h"
  36. #include "program/prog_parameter.h"
  37. #include "program/program.h"
  38. }
  39.  
  40. class get_sampler_name : public ir_hierarchical_visitor
  41. {
  42. public:
  43.    get_sampler_name(ir_dereference *last,
  44.                     struct gl_shader_program *shader_program)
  45.    {
  46.       this->mem_ctx = ralloc_context(NULL);
  47.       this->shader_program = shader_program;
  48.       this->name = NULL;
  49.       this->offset = 0;
  50.       this->last = last;
  51.    }
  52.  
  53.    ~get_sampler_name()
  54.    {
  55.       ralloc_free(this->mem_ctx);
  56.    }
  57.  
  58.    virtual ir_visitor_status visit(ir_dereference_variable *ir)
  59.    {
  60.       this->name = ir->var->name;
  61.       return visit_continue;
  62.    }
  63.  
  64.    virtual ir_visitor_status visit_leave(ir_dereference_record *ir)
  65.    {
  66.       this->name = ralloc_asprintf(mem_ctx, "%s.%s", name, ir->field);
  67.       return visit_continue;
  68.    }
  69.  
  70.    virtual ir_visitor_status visit_leave(ir_dereference_array *ir)
  71.    {
  72.       ir_constant *index = ir->array_index->as_constant();
  73.       int i;
  74.  
  75.       if (index) {
  76.          i = index->value.i[0];
  77.       } else {
  78.          /* GLSL 1.10 and 1.20 allowed variable sampler array indices,
  79.           * while GLSL 1.30 requires that the array indices be
  80.           * constant integer expressions.  We don't expect any driver
  81.           * to actually work with a really variable array index, so
  82.           * all that would work would be an unrolled loop counter that ends
  83.           * up being constant above.
  84.           */
  85.          ralloc_strcat(&shader_program->InfoLog,
  86.                        "warning: Variable sampler array index unsupported.\n"
  87.                        "This feature of the language was removed in GLSL 1.20 "
  88.                        "and is unlikely to be supported for 1.10 in Mesa.\n");
  89.          i = 0;
  90.       }
  91.       if (ir != last) {
  92.          this->name = ralloc_asprintf(mem_ctx, "%s[%d]", name, i);
  93.       } else {
  94.          offset = i;
  95.       }
  96.       return visit_continue;
  97.    }
  98.  
  99.    struct gl_shader_program *shader_program;
  100.    const char *name;
  101.    void *mem_ctx;
  102.    int offset;
  103.    ir_dereference *last;
  104. };
  105.  
  106.  
  107. extern "C" int
  108. _mesa_get_sampler_uniform_value(class ir_dereference *sampler,
  109.                                 struct gl_shader_program *shader_program,
  110.                                 const struct gl_program *prog)
  111. {
  112.    get_sampler_name getname(sampler, shader_program);
  113.  
  114.    GLuint shader = _mesa_program_target_to_index(prog->Target);
  115.  
  116.    sampler->accept(&getname);
  117.  
  118.    unsigned location;
  119.    if (!shader_program->UniformHash->get(location, getname.name)) {
  120.       linker_error(shader_program,
  121.                    "failed to find sampler named %s.\n", getname.name);
  122.       return 0;
  123.    }
  124.  
  125.    if (!shader_program->UniformStorage[location].sampler[shader].active) {
  126.       assert(0 && "cannot return a sampler");
  127.       linker_error(shader_program,
  128.                    "cannot return a sampler named %s, because it is not "
  129.                    "used in this shader stage. This is a driver bug.\n",
  130.                    getname.name);
  131.       return 0;
  132.    }
  133.  
  134.    return shader_program->UniformStorage[location].sampler[shader].index +
  135.           getname.offset;
  136. }
  137.