2 * Copyright (C) 2005-2007 Brian Paul All Rights Reserved.
3 * Copyright (C) 2008 VMware, Inc. All Rights Reserved.
4 * Copyright © 2010 Intel Corporation
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:
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
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.
27 #include "glsl_types.h"
28 #include "ir_visitor.h"
31 #include "main/compiler.h"
32 #include "main/mtypes.h"
33 #include "program/prog_parameter.h"
36 static void fail_link(struct gl_shader_program *prog, const char *fmt, ...) PRINTFLIKE(2, 3);
38 static void fail_link(struct gl_shader_program *prog, const char *fmt, ...)
42 ralloc_vasprintf_append(&prog->InfoLog, fmt, args);
45 prog->LinkStatus = GL_FALSE;
48 class get_sampler_name : public ir_hierarchical_visitor
51 get_sampler_name(ir_dereference *last,
52 struct gl_shader_program *shader_program)
54 this->mem_ctx = ralloc_context(NULL);
55 this->shader_program = shader_program;
63 ralloc_free(this->mem_ctx);
66 virtual ir_visitor_status visit(ir_dereference_variable *ir)
68 this->name = ir->var->name;
69 return visit_continue;
72 virtual ir_visitor_status visit_leave(ir_dereference_record *ir)
74 this->name = ralloc_asprintf(mem_ctx, "%s.%s", name, ir->field);
75 return visit_continue;
78 virtual ir_visitor_status visit_leave(ir_dereference_array *ir)
80 ir_constant *index = ir->array_index->as_constant();
84 i = index->value.i[0];
86 /* GLSL 1.10 and 1.20 allowed variable sampler array indices,
87 * while GLSL 1.30 requires that the array indices be
88 * constant integer expressions. We don't expect any driver
89 * to actually work with a really variable array index, so
90 * all that would work would be an unrolled loop counter that ends
91 * up being constant above.
93 ralloc_strcat(&shader_program->InfoLog,
94 "warning: Variable sampler array index unsupported.\n"
95 "This feature of the language was removed in GLSL 1.20 "
96 "and is unlikely to be supported for 1.10 in Mesa.\n");
100 this->name = ralloc_asprintf(mem_ctx, "%s[%d]", name, i);
104 return visit_continue;
107 struct gl_shader_program *shader_program;
111 ir_dereference *last;
116 _mesa_get_sampler_uniform_value(class ir_dereference *sampler,
117 struct gl_shader_program *shader_program,
118 const struct gl_program *prog)
120 get_sampler_name getname(sampler, shader_program);
122 sampler->accept(&getname);
124 GLint index = _mesa_lookup_parameter_index(prog->Parameters, -1,
128 fail_link(shader_program,
129 "failed to find sampler named %s.\n", getname.name);
133 index += getname.offset;
135 return prog->Parameters->ParameterValues[index][0];