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