src/mesa/main/version.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2010  VMware, Inc.  All Rights Reserved.
   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 shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  20  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24
  25 #include "context.h"
  26 #include "version.h"
  27
  28
  29
  30 /**
  31  * Examine enabled GL extensions to determine GL version.
  32  * Return major and minor version numbers.
  33  */
  34 static void
  35 compute_version(struct gl_context *ctx)
  36 {
  37    GLuint major, minor;
  38    static const int max = 100;
  39
  40    const GLboolean ver_1_3 = (ctx->Extensions.ARB_multisample &&
  41                               ctx->Extensions.ARB_multitexture &&
  42                               ctx->Extensions.ARB_texture_border_clamp &&
  43                               ctx->Extensions.ARB_texture_compression &&
  44                               ctx->Extensions.ARB_texture_cube_map &&
  45                               ctx->Extensions.EXT_texture_env_add &&
  46                               ctx->Extensions.ARB_texture_env_combine &&
  47                               ctx->Extensions.ARB_texture_env_dot3);
  48    const GLboolean ver_1_4 = (ver_1_3 &&
  49                               ctx->Extensions.ARB_depth_texture &&
  50                               ctx->Extensions.ARB_shadow &&
  51                               ctx->Extensions.ARB_texture_env_crossbar &&
  52                               ctx->Extensions.ARB_texture_mirrored_repeat &&
  53                               ctx->Extensions.ARB_window_pos &&
  54                               ctx->Extensions.EXT_blend_color &&
  55                               ctx->Extensions.EXT_blend_func_separate &&
  56                               ctx->Extensions.EXT_blend_minmax &&
  57                               ctx->Extensions.EXT_blend_subtract &&
  58                               ctx->Extensions.EXT_fog_coord &&
  59                               ctx->Extensions.EXT_multi_draw_arrays &&
  60                               ctx->Extensions.EXT_point_parameters &&
  61                               ctx->Extensions.EXT_secondary_color &&
  62                               ctx->Extensions.EXT_stencil_wrap &&
  63                               ctx->Extensions.EXT_texture_lod_bias &&
  64                               ctx->Extensions.SGIS_generate_mipmap);
  65    const GLboolean ver_1_5 = (ver_1_4 &&
  66                               ctx->Extensions.ARB_occlusion_query &&
  67                               ctx->Extensions.ARB_vertex_buffer_object &&
  68                               ctx->Extensions.EXT_shadow_funcs);
  69    const GLboolean ver_2_0 = (ver_1_5 &&
  70                               ctx->Extensions.ARB_draw_buffers &&
  71                               ctx->Extensions.ARB_point_sprite &&
  72                               ctx->Extensions.ARB_shader_objects &&
  73                               ctx->Extensions.ARB_vertex_shader &&
  74                               ctx->Extensions.ARB_fragment_shader &&
  75                               ctx->Extensions.ARB_texture_non_power_of_two &&
  76                               ctx->Extensions.EXT_blend_equation_separate &&
  77
  78                               /* Technically, 2.0 requires the functionality
  79                                * of the EXT version.  Enable 2.0 if either
  80                                * extension is available, and assume that a
  81                                * driver that only exposes the ATI extension
  82                                * will fallback to software when necessary.
  83                                */
  84                               (ctx->Extensions.EXT_stencil_two_side
  85                                || ctx->Extensions.ATI_separate_stencil));
  86    const GLboolean ver_2_1 = (ver_2_0 &&
  87                               ctx->Const.GLSLVersion >= 120 &&
  88                               ctx->Extensions.EXT_pixel_buffer_object &&
  89                               ctx->Extensions.EXT_texture_sRGB);
  90    const GLboolean ver_3_0 = (ver_2_1 &&
  91                               ctx->Extensions.ARB_half_float_pixel &&
  92                               ctx->Extensions.ARB_map_buffer_range &&
  93                               ctx->Extensions.ARB_texture_float &&
  94                               ctx->Extensions.ARB_texture_rg &&
  95                               ctx->Extensions.ARB_texture_compression_rgtc &&
  96                               ctx->Extensions.APPLE_vertex_array_object &&
  97                               ctx->Extensions.EXT_draw_buffers2 &&
  98                               ctx->Extensions.EXT_framebuffer_blit &&
  99                               ctx->Extensions.EXT_framebuffer_multisample &&
 100                               ctx->Extensions.EXT_framebuffer_object &&
 101                               ctx->Extensions.EXT_framebuffer_sRGB &&
 102                               ctx->Extensions.EXT_packed_depth_stencil &&
 103                               ctx->Extensions.EXT_packed_float &&
 104                               ctx->Extensions.EXT_texture_array &&
 105                               ctx->Extensions.EXT_texture_integer &&
 106                               ctx->Extensions.EXT_texture_shared_exponent &&
 107                               ctx->Extensions.EXT_transform_feedback &&
 108                               ctx->Extensions.NV_conditional_render);
 109    const GLboolean ver_3_1 = (ver_3_0 &&
 110                               ctx->Extensions.ARB_copy_buffer &&
 111                               ctx->Extensions.ARB_draw_instanced &&
 112                               ctx->Extensions.ARB_texture_buffer_object &&
 113                               ctx->Extensions.ARB_uniform_buffer_object &&
 114                               ctx->Extensions.NV_primitive_restart &&
 115                               ctx->Extensions.NV_texture_rectangle &&
 116                               ctx->Const.MaxVertexTextureImageUnits >= 16);
 117    const GLboolean ver_3_2 = (ver_3_1 &&
 118                               ctx->Extensions.ARB_depth_clamp &&
 119                               ctx->Extensions.ARB_draw_elements_base_vertex &&
 120                               ctx->Extensions.ARB_fragment_coord_conventions &&
 121                               ctx->Extensions.ARB_geometry_shader4 &&
 122                               ctx->Extensions.EXT_provoking_vertex &&
 123                               ctx->Extensions.ARB_seamless_cube_map &&
 124                               ctx->Extensions.ARB_sync &&
 125                               ctx->Extensions.ARB_texture_multisample &&
 126                               ctx->Extensions.EXT_vertex_array_bgra);
 127    const GLboolean ver_3_3 = (ver_3_2 &&
 128                               ctx->Extensions.ARB_blend_func_extended &&
 129                               ctx->Extensions.ARB_explicit_attrib_location &&
 130                               ctx->Extensions.ARB_instanced_arrays &&
 131                               ctx->Extensions.ARB_occlusion_query2 &&
 132                               ctx->Extensions.ARB_sampler_objects &&
 133                               ctx->Extensions.ARB_texture_rgb10_a2ui &&
 134                               ctx->Extensions.ARB_timer_query &&
 135                               ctx->Extensions.ARB_vertex_type_2_10_10_10_rev &&
 136                               ctx->Extensions.EXT_texture_swizzle);
 137
 138    if (ver_3_3) {
 139       major = 3;
 140       minor = 3;
 141    }
 142    else if (ver_3_2) {
 143       major = 3;
 144       minor = 2;
 145    }
 146    else if (ver_3_1) {
 147       major = 3;
 148       minor = 1;
 149    }
 150    else if (ver_3_0) {
 151       major = 3;
 152       minor = 0;
 153    }
 154    else if (ver_2_1) {
 155       major = 2;
 156       minor = 1;
 157    }
 158    else if (ver_2_0) {
 159       major = 2;
 160       minor = 0;
 161    }
 162    else if (ver_1_5) {
 163       major = 1;
 164       minor = 5;
 165    }
 166    else if (ver_1_4) {
 167       major = 1;
 168       minor = 4;
 169    }
 170    else if (ver_1_3) {
 171       major = 1;
 172       minor = 3;
 173    }
 174    else {
 175       major = 1;
 176       minor = 2;
 177    }
 178
 179    ctx->VersionMajor = major;
 180    ctx->VersionMinor = minor;
 181    ctx->VersionString = (char *) malloc(max);
 182    if (ctx->VersionString) {
 183       _mesa_snprintf(ctx->VersionString, max,
 184                      "%u.%u Mesa " MESA_VERSION_STRING,
 185                      ctx->VersionMajor, ctx->VersionMinor);
 186    }
 187 }
 188
 189 static void
 190 compute_version_es1(struct gl_context *ctx)
 191 {
 192    static const int max = 100;
 193
 194    /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
 195    const GLboolean ver_1_0 = (ctx->Extensions.ARB_multisample &&
 196                               ctx->Extensions.ARB_multitexture &&
 197                               ctx->Extensions.ARB_texture_compression &&
 198                               ctx->Extensions.EXT_texture_env_add &&
 199                               ctx->Extensions.ARB_texture_env_combine &&
 200                               ctx->Extensions.ARB_texture_env_dot3);
 201    /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
 202    const GLboolean ver_1_1 = (ver_1_0 &&
 203                               ctx->Extensions.EXT_point_parameters &&
 204                               ctx->Extensions.SGIS_generate_mipmap &&
 205                               ctx->Extensions.ARB_vertex_buffer_object);
 206
 207    if (ver_1_1) {
 208       ctx->VersionMajor = 1;
 209       ctx->VersionMinor = 1;
 210    } else if (ver_1_0) {
 211       ctx->VersionMajor = 1;
 212       ctx->VersionMinor = 0;
 213    } else {
 214       _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
 215    }
 216
 217    ctx->VersionString = (char *) malloc(max);
 218    if (ctx->VersionString) {
 219       _mesa_snprintf(ctx->VersionString, max,
 220                      "OpenGL ES-CM 1.%d Mesa " MESA_VERSION_STRING,
 221                      ctx->VersionMinor);
 222    }
 223 }
 224
 225 static void
 226 compute_version_es2(struct gl_context *ctx)
 227 {
 228    static const int max = 100;
 229
 230    /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
 231    const GLboolean ver_2_0 = (ctx->Extensions.ARB_multisample &&
 232                               ctx->Extensions.ARB_multitexture &&
 233                               ctx->Extensions.ARB_texture_compression &&
 234                               ctx->Extensions.ARB_texture_cube_map &&
 235                               ctx->Extensions.ARB_texture_mirrored_repeat &&
 236                               ctx->Extensions.EXT_blend_color &&
 237                               ctx->Extensions.EXT_blend_func_separate &&
 238                               ctx->Extensions.EXT_blend_minmax &&
 239                               ctx->Extensions.EXT_blend_subtract &&
 240                               ctx->Extensions.EXT_stencil_wrap &&
 241                               ctx->Extensions.ARB_vertex_buffer_object &&
 242                               ctx->Extensions.ARB_shader_objects &&
 243                               ctx->Extensions.ARB_vertex_shader &&
 244                               ctx->Extensions.ARB_fragment_shader &&
 245                               ctx->Extensions.ARB_texture_non_power_of_two &&
 246                               ctx->Extensions.EXT_blend_equation_separate);
 247    if (ver_2_0) {
 248       ctx->VersionMajor = 2;
 249       ctx->VersionMinor = 0;
 250    } else {
 251       _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
 252    }
 253
 254    ctx->VersionString = (char *) malloc(max);
 255    if (ctx->VersionString) {
 256       _mesa_snprintf(ctx->VersionString, max,
 257                      "OpenGL ES 2.0 Mesa " MESA_VERSION_STRING);
 258    }
 259 }
 260
 261 /**
 262  * Set the context's VersionMajor, VersionMinor, VersionString fields.
 263  * This should only be called once as part of context initialization
 264  * or to perform version check for GLX_ARB_create_context_profile.
 265  */
 266 void
 267 _mesa_compute_version(struct gl_context *ctx)
 268 {
 269    if (ctx->VersionMajor)
 270       return;
 271
 272    switch (ctx->API) {
 273    case API_OPENGL:
 274       compute_version(ctx);
 275       break;
 276    case API_OPENGLES:
 277       compute_version_es1(ctx);
 278       break;
 279    case API_OPENGLES2:
 280       compute_version_es2(ctx);
 281       break;
 282    }
 283
 284 }