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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 "ir_uniform.h"
  31.  
  32. #include "main/mtypes.h"
  33. #include "program/hash_table.h"
  34. #include "program/prog_parameter.h"
  35. #include "program/program.h"
  36.  
  37.  
  38. class get_sampler_name : public ir_hierarchical_visitor
  39. {
  40. public:
  41.    get_sampler_name(ir_dereference *last,
  42.                     struct gl_shader_program *shader_program)
  43.    {
  44.       this->mem_ctx = ralloc_context(NULL);
  45.       this->shader_program = shader_program;
  46.       this->name = NULL;
  47.       this->offset = 0;
  48.       this->last = last;
  49.    }
  50.  
  51.    ~get_sampler_name()
  52.    {
  53.       ralloc_free(this->mem_ctx);
  54.    }
  55.  
  56.    virtual ir_visitor_status visit(ir_dereference_variable *ir)
  57.    {
  58.       this->name = ir->var->name;
  59.       return visit_continue;
  60.    }
  61.  
  62.    virtual ir_visitor_status visit_leave(ir_dereference_record *ir)
  63.    {
  64.       this->name = ralloc_asprintf(mem_ctx, "%s.%s", name, ir->field);
  65.       return visit_continue;
  66.    }
  67.  
  68.    virtual ir_visitor_status visit_leave(ir_dereference_array *ir)
  69.    {
  70.       ir_constant *index = ir->array_index->as_constant();
  71.       int i;
  72.  
  73.       if (index) {
  74.          i = index->value.i[0];
  75.       } else {
  76.          /* GLSL 1.10 and 1.20 allowed variable sampler array indices,
  77.           * while GLSL 1.30 requires that the array indices be
  78.           * constant integer expressions.  We don't expect any driver
  79.           * to actually work with a really variable array index, so
  80.           * all that would work would be an unrolled loop counter that ends
  81.           * up being constant above.
  82.           */
  83.          ralloc_strcat(&shader_program->InfoLog,
  84.                        "warning: Variable sampler array index unsupported.\n"
  85.                        "This feature of the language was removed in GLSL 1.20 "
  86.                        "and is unlikely to be supported for 1.10 in Mesa.\n");
  87.          i = 0;
  88.       }
  89.       if (ir != last) {
  90.          this->name = ralloc_asprintf(mem_ctx, "%s[%d]", name, i);
  91.       } else {
  92.          offset = i;
  93.       }
  94.       return visit_continue;
  95.    }
  96.  
  97.    struct gl_shader_program *shader_program;
  98.    const char *name;
  99.    void *mem_ctx;
  100.    int offset;
  101.    ir_dereference *last;
  102. };
  103.  
  104.  
  105. int
  106. _mesa_get_sampler_uniform_value(class ir_dereference *sampler,
  107.                                 struct gl_shader_program *shader_program,
  108.                                 const struct gl_program *prog)
  109. {
  110.    get_sampler_name getname(sampler, shader_program);
  111.  
  112.    GLuint shader = _mesa_program_enum_to_shader_stage(prog->Target);
  113.  
  114.    sampler->accept(&getname);
  115.  
  116.    unsigned location;
  117.    if (!shader_program->UniformHash->get(location, getname.name)) {
  118.       linker_error(shader_program,
  119.                    "failed to find sampler named %s.\n", getname.name);
  120.       return 0;
  121.    }
  122.  
  123.    if (!shader_program->UniformStorage[location].sampler[shader].active) {
  124.       assert(0 && "cannot return a sampler");
  125.       linker_error(shader_program,
  126.                    "cannot return a sampler named %s, because it is not "
  127.                    "used in this shader stage. This is a driver bug.\n",
  128.                    getname.name);
  129.       return 0;
  130.    }
  131.  
  132.    return shader_program->UniformStorage[location].sampler[shader].index +
  133.           getname.offset;
  134. }
  135.  
  136.  
  137. class ir_rvalue *
  138. _mesa_get_sampler_array_nonconst_index(class ir_dereference *sampler)
  139. {
  140.    ir_dereference_array *deref_arr = sampler->as_dereference_array();
  141.    if (!deref_arr || deref_arr->array_index->as_constant())
  142.       return NULL;
  143.  
  144.    return deref_arr->array_index;
  145. }
  146.