ir_variable.cpp

   1 /*
   2  * Copyright © 2010 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include "glsl_parser_extras.h"
  25 #include "glsl_symbol_table.h"
  26 #include "ir.h"
  27 #include "builtin_variables.h"
  28
  29 #ifndef Elements
  30 #define Elements(x) (sizeof(x)/sizeof(*(x)))
  31 #endif
  32
  33 static void
  34 add_builtin_variable(const builtin_variable *proto, exec_list *instructions,
  35                      glsl_symbol_table *symtab)
  36 {
  37    /* Create a new variable declaration from the description supplied by
  38     * the caller.
  39     */
  40    const glsl_type *const type = symtab->get_type(proto->type);
  41
  42    assert(type != NULL);
  43
  44    ir_variable *var = new ir_variable(type, proto->name);
  45
  46    var->mode = proto->mode;
  47    if (var->mode != ir_var_out)
  48       var->read_only = true;
  49
  50
  51    /* Once the variable is created an initialized, add it to the symbol table
  52     * and add the declaration to the IR stream.
  53     */
  54    instructions->push_tail(var);
  55
  56    symtab->add_variable(var->name, var);
  57 }
  58
  59 static void
  60 generate_110_uniforms(exec_list *instructions,
  61                       glsl_symbol_table *symtab)
  62 {
  63    for (unsigned i = 0
  64            ; i < Elements(builtin_110_deprecated_uniforms)
  65            ; i++) {
  66       add_builtin_variable(& builtin_110_deprecated_uniforms[i],
  67                            instructions, symtab);
  68    }
  69
  70    /* FINISHME: Add support for gl_TextureMatrix[].  The size of this array is
  71     * FINISHME: implementation dependent based on the value of
  72     * FINISHME: GL_MAX_TEXTURE_COORDS.
  73     */
  74
  75    /* FINISHME: Add support for gl_DepthRangeParameters */
  76    /* FINISHME: Add support for gl_ClipPlane[] */
  77    /* FINISHME: Add support for gl_PointParameters */
  78
  79    /* FINISHME: Add support for gl_MaterialParameters
  80     * FINISHME: (glFrontMaterial, glBackMaterial)
  81     */
  82
  83    /* FINISHME: Add support for gl_LightSource[] */
  84    /* FINISHME: Add support for gl_LightModel */
  85    /* FINISHME: Add support for gl_FrontLightProduct[], gl_BackLightProduct[] */
  86    /* FINISHME: Add support for gl_TextureEnvColor[] */
  87    /* FINISHME: Add support for gl_ObjectPlane*[], gl_EyePlane*[] */
  88    /* FINISHME: Add support for gl_Fog */
  89 }
  90
  91 static void
  92 generate_110_vs_variables(exec_list *instructions,
  93                           glsl_symbol_table *symtab)
  94 {
  95    for (unsigned i = 0; i < Elements(builtin_core_vs_variables); i++) {
  96       add_builtin_variable(& builtin_core_vs_variables[i],
  97                            instructions, symtab);
  98    }
  99
 100    for (unsigned i = 0
 101            ; i < Elements(builtin_110_deprecated_vs_variables)
 102            ; i++) {
 103       add_builtin_variable(& builtin_110_deprecated_vs_variables[i],
 104                            instructions, symtab);
 105    }
 106    generate_110_uniforms(instructions, symtab);
 107
 108    /* FINISHME: Add support fo gl_TexCoord.  The size of this array is
 109     * FINISHME: implementation dependent based on the value of
 110     * FINISHME: GL_MAX_TEXTURE_COORDS.
 111     */
 112 }
 113
 114
 115 static void
 116 generate_120_vs_variables(exec_list *instructions,
 117                           glsl_symbol_table *symtab)
 118 {
 119    /* GLSL version 1.20 did not add any built-in variables in the vertex
 120     * shader.
 121     */
 122    generate_110_vs_variables(instructions, symtab);
 123 }
 124
 125
 126 static void
 127 generate_130_vs_variables(exec_list *instructions,
 128                           glsl_symbol_table *symtab)
 129 {
 130    generate_120_vs_variables(instructions, symtab);
 131
 132    for (unsigned i = 0; i < Elements(builtin_130_vs_variables); i++) {
 133       add_builtin_variable(& builtin_130_vs_variables[i],
 134                            instructions, symtab);
 135    }
 136
 137    /* FINISHME: Add support fo gl_ClipDistance.  The size of this array is
 138     * FINISHME: implementation dependent based on the value of
 139     * FINISHME: GL_MAX_CLIP_DISTANCES.
 140     */
 141 }
 142
 143
 144 static void
 145 initialize_vs_variables(exec_list *instructions,
 146                         struct _mesa_glsl_parse_state *state)
 147 {
 148
 149    switch (state->language_version) {
 150    case 110:
 151       generate_110_vs_variables(instructions, state->symbols);
 152       break;
 153    case 120:
 154       generate_120_vs_variables(instructions, state->symbols);
 155       break;
 156    case 130:
 157       generate_130_vs_variables(instructions, state->symbols);
 158       break;
 159    }
 160 }
 161
 162 static void
 163 generate_110_fs_variables(exec_list *instructions,
 164                           glsl_symbol_table *symtab)
 165 {
 166    for (unsigned i = 0; i < Elements(builtin_core_fs_variables); i++) {
 167       add_builtin_variable(& builtin_core_fs_variables[i],
 168                            instructions, symtab);
 169    }
 170
 171    /* FINISHME: Add support for gl_TexCoord[] */
 172    for (unsigned i = 0
 173            ; i < Elements(builtin_110_deprecated_fs_variables)
 174            ; i++) {
 175       add_builtin_variable(& builtin_110_deprecated_fs_variables[i],
 176                            instructions, symtab);
 177    }
 178    generate_110_uniforms(instructions, symtab);
 179
 180    /* FINISHME: Add support for gl_FragData[GL_MAX_DRAW_BUFFERS]. */
 181 }
 182
 183 static void
 184 generate_120_fs_variables(exec_list *instructions,
 185                           glsl_symbol_table *symtab)
 186 {
 187    /* GLSL version 1.20 did not add any built-in variables in the fragment
 188     * shader.
 189     */
 190    generate_110_fs_variables(instructions, symtab);
 191 }
 192
 193 static void
 194 generate_130_fs_variables(exec_list *instructions,
 195                           glsl_symbol_table *symtab)
 196 {
 197    generate_120_fs_variables(instructions, symtab);
 198
 199    /* FINISHME: Add support fo gl_ClipDistance.  The size of this array is
 200     * FINISHME: implementation dependent based on the value of
 201     * FINISHME: GL_MAX_CLIP_DISTANCES.
 202     */
 203 }
 204
 205 static void
 206 initialize_fs_variables(exec_list *instructions,
 207                         struct _mesa_glsl_parse_state *state)
 208 {
 209
 210    switch (state->language_version) {
 211    case 110:
 212       generate_110_fs_variables(instructions, state->symbols);
 213       break;
 214    case 120:
 215       generate_120_fs_variables(instructions, state->symbols);
 216       break;
 217    case 130:
 218       generate_130_fs_variables(instructions, state->symbols);
 219       break;
 220    }
 221 }
 222
 223 void
 224 _mesa_glsl_initialize_variables(exec_list *instructions,
 225                                 struct _mesa_glsl_parse_state *state)
 226 {
 227    switch (state->target) {
 228    case vertex_shader:
 229       initialize_vs_variables(instructions, state);
 230       break;
 231    case geometry_shader:
 232       break;
 233    case fragment_shader:
 234       initialize_fs_variables(instructions, state);
 235       break;
 236    }
 237 }