aboutsummaryrefslogtreecommitdiffstats
path: root/src/mesa/program/sampler.cpp
blob: 29a5408717a8c42b3aceb1672a499244d8b5b4bd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
/*
 * Copyright (C) 2005-2007  Brian Paul   All Rights Reserved.
 * Copyright (C) 2008  VMware, Inc.   All Rights Reserved.
 * Copyright © 2010 Intel Corporation
 *
 * 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, sublicense,
 * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS 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 "ir.h"
#include "glsl_types.h"
#include "ir_visitor.h"
#include "../glsl/program.h"
#include "program/hash_table.h"
#include "ir_uniform.h"

extern "C" {
#include "main/compiler.h"
#include "main/mtypes.h"
#include "program/prog_parameter.h"
#include "program/program.h"
}

class get_sampler_name : public ir_hierarchical_visitor
{
public:
   get_sampler_name(ir_dereference *last,
		    struct gl_shader_program *shader_program)
   {
      this->mem_ctx = ralloc_context(NULL);
      this->shader_program = shader_program;
      this->name = NULL;
      this->offset = 0;
      this->last = last;
   }

   ~get_sampler_name()
   {
      ralloc_free(this->mem_ctx);
   }

   virtual ir_visitor_status visit(ir_dereference_variable *ir)
   {
      this->name = ir->var->name;
      return visit_continue;
   }

   virtual ir_visitor_status visit_leave(ir_dereference_record *ir)
   {
      this->name = ralloc_asprintf(mem_ctx, "%s.%s", name, ir->field);
      return visit_continue;
   }

   virtual ir_visitor_status visit_leave(ir_dereference_array *ir)
   {
      ir_constant *index = ir->array_index->as_constant();
      int i;

      if (index) {
	 i = index->value.i[0];
      } else {
	 /* GLSL 1.10 and 1.20 allowed variable sampler array indices,
	  * while GLSL 1.30 requires that the array indices be
	  * constant integer expressions.  We don't expect any driver
	  * to actually work with a really variable array index, so
	  * all that would work would be an unrolled loop counter that ends
	  * up being constant above.
	  */
	 ralloc_strcat(&shader_program->InfoLog,
		       "warning: Variable sampler array index unsupported.\n"
		       "This feature of the language was removed in GLSL 1.20 "
		       "and is unlikely to be supported for 1.10 in Mesa.\n");
	 i = 0;
      }
      if (ir != last) {
	 this->name = ralloc_asprintf(mem_ctx, "%s[%d]", name, i);
      } else {
	 offset = i;
      }
      return visit_continue;
   }

   struct gl_shader_program *shader_program;
   const char *name;
   void *mem_ctx;
   int offset;
   ir_dereference *last;
};


extern "C" int
_mesa_get_sampler_uniform_value(class ir_dereference *sampler,
				struct gl_shader_program *shader_program,
				const struct gl_program *prog)
{
   get_sampler_name getname(sampler, shader_program);

   GLuint shader = _mesa_program_enum_to_shader_stage(prog->Target);

   sampler->accept(&getname);

   unsigned location;
   if (!shader_program->UniformHash->get(location, getname.name)) {
      linker_error(shader_program,
		   "failed to find sampler named %s.\n", getname.name);
      return 0;
   }

   if (!shader_program->UniformStorage[location].sampler[shader].active) {
      assert(0 && "cannot return a sampler");
      linker_error(shader_program,
		   "cannot return a sampler named %s, because it is not "
                   "used in this shader stage. This is a driver bug.\n",
                   getname.name);
      return 0;
   }

   return shader_program->UniformStorage[location].sampler[shader].index +
          getname.offset;
}


extern "C" class ir_rvalue *
_mesa_get_sampler_array_nonconst_index(class ir_dereference *sampler)
{
   ir_dereference_array *deref_arr = sampler->as_dereference_array();
   if (!deref_arr || deref_arr->array_index->as_constant())
      return NULL;

   return deref_arr->array_index;
}