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 "imports.h"
  26 #include "mtypes.h"
  27 #include "version.h"
  28 #include "git_sha1.h"
  29
  30 /**
  31  * Override the context's GL version if the environment variable
  32  * MESA_GL_VERSION_OVERRIDE is set. Valid values of MESA_GL_VERSION_OVERRIDE
  33  * are point-separated version numbers, such as "3.0".
  34  */
  35 static void
  36 override_version(struct gl_context *ctx, GLuint *major, GLuint *minor)
  37 {
  38    const char *env_var = "MESA_GL_VERSION_OVERRIDE";
  39    const char *version;
  40    int n;
  41
  42    version = getenv(env_var);
  43    if (!version) {
  44       return;
  45    }
  46
  47    n = sscanf(version, "%u.%u", major, minor);
  48    if (n != 2) {
  49       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
  50       return;
  51    }
  52 }
  53
  54 /**
  55  * Examine enabled GL extensions to determine GL version.
  56  * Return major and minor version numbers.
  57  */
  58 static void
  59 compute_version(struct gl_context *ctx)
  60 {
  61    GLuint major, minor;
  62    static const int max = 100;
  63
  64    const GLboolean ver_1_3 = (ctx->Extensions.ARB_multitexture &&
  65                               ctx->Extensions.ARB_texture_border_clamp &&
  66                               ctx->Extensions.ARB_texture_cube_map &&
  67                               ctx->Extensions.EXT_texture_env_add &&
  68                               ctx->Extensions.ARB_texture_env_combine &&
  69                               ctx->Extensions.ARB_texture_env_dot3);
  70    const GLboolean ver_1_4 = (ver_1_3 &&
  71                               ctx->Extensions.ARB_depth_texture &&
  72                               ctx->Extensions.ARB_shadow &&
  73                               ctx->Extensions.ARB_texture_env_crossbar &&
  74                               ctx->Extensions.ARB_texture_mirrored_repeat &&
  75                               ctx->Extensions.ARB_window_pos &&
  76                               ctx->Extensions.EXT_blend_color &&
  77                               ctx->Extensions.EXT_blend_func_separate &&
  78                               ctx->Extensions.EXT_blend_minmax &&
  79                               ctx->Extensions.EXT_blend_subtract &&
  80                               ctx->Extensions.EXT_fog_coord &&
  81                               ctx->Extensions.EXT_point_parameters &&
  82                               ctx->Extensions.EXT_secondary_color &&
  83                               ctx->Extensions.EXT_stencil_wrap &&
  84                               ctx->Extensions.EXT_texture_lod_bias);
  85    const GLboolean ver_1_5 = (ver_1_4 &&
  86                               ctx->Extensions.ARB_occlusion_query &&
  87                               ctx->Extensions.EXT_shadow_funcs);
  88    const GLboolean ver_2_0 = (ver_1_5 &&
  89                               ctx->Extensions.ARB_draw_buffers &&
  90                               ctx->Extensions.ARB_point_sprite &&
  91                               ctx->Extensions.ARB_shader_objects &&
  92                               ctx->Extensions.ARB_vertex_shader &&
  93                               ctx->Extensions.ARB_fragment_shader &&
  94                               ctx->Extensions.ARB_texture_non_power_of_two &&
  95                               ctx->Extensions.EXT_blend_equation_separate &&
  96
  97                               /* Technically, 2.0 requires the functionality
  98                                * of the EXT version.  Enable 2.0 if either
  99                                * extension is available, and assume that a
 100                                * driver that only exposes the ATI extension
 101                                * will fallback to software when necessary.
 102                                */
 103                               (ctx->Extensions.EXT_stencil_two_side
 104                                || ctx->Extensions.ATI_separate_stencil));
 105    const GLboolean ver_2_1 = (ver_2_0 &&
 106                               ctx->Const.GLSLVersion >= 120 &&
 107                               ctx->Extensions.EXT_pixel_buffer_object &&
 108                               ctx->Extensions.EXT_texture_sRGB);
 109    const GLboolean ver_3_0 = (ver_2_1 &&
 110                               ctx->Extensions.ARB_color_buffer_float &&
 111                               ctx->Extensions.ARB_depth_buffer_float &&
 112                               ctx->Extensions.ARB_half_float_pixel &&
 113                               ctx->Extensions.ARB_map_buffer_range &&
 114                               ctx->Extensions.ARB_texture_float &&
 115                               ctx->Extensions.ARB_texture_rg &&
 116                               ctx->Extensions.ARB_texture_compression_rgtc &&
 117                               ctx->Extensions.APPLE_vertex_array_object &&
 118                               ctx->Extensions.EXT_draw_buffers2 &&
 119                               ctx->Extensions.EXT_framebuffer_blit &&
 120                               ctx->Extensions.EXT_framebuffer_multisample &&
 121                               ctx->Extensions.EXT_framebuffer_object &&
 122                               ctx->Extensions.EXT_framebuffer_sRGB &&
 123                               ctx->Extensions.EXT_packed_depth_stencil &&
 124                               ctx->Extensions.EXT_packed_float &&
 125                               ctx->Extensions.EXT_texture_array &&
 126                               ctx->Extensions.EXT_texture_integer &&
 127                               ctx->Extensions.EXT_texture_shared_exponent &&
 128                               ctx->Extensions.EXT_transform_feedback &&
 129                               ctx->Extensions.NV_conditional_render);
 130    const GLboolean ver_3_1 = (ver_3_0 &&
 131                               ctx->Extensions.ARB_copy_buffer &&
 132                               ctx->Extensions.ARB_draw_instanced &&
 133                               ctx->Extensions.ARB_texture_buffer_object &&
 134                               ctx->Extensions.ARB_uniform_buffer_object &&
 135                               ctx->Extensions.EXT_texture_snorm &&
 136                               ctx->Extensions.NV_primitive_restart &&
 137                               ctx->Extensions.NV_texture_rectangle &&
 138                               ctx->Const.MaxVertexTextureImageUnits >= 16);
 139    const GLboolean ver_3_2 = (ver_3_1 &&
 140                               ctx->Extensions.ARB_depth_clamp &&
 141                               ctx->Extensions.ARB_draw_elements_base_vertex &&
 142                               ctx->Extensions.ARB_fragment_coord_conventions &&
 143                               ctx->Extensions.ARB_geometry_shader4 &&
 144                               ctx->Extensions.EXT_provoking_vertex &&
 145                               ctx->Extensions.ARB_seamless_cube_map &&
 146                               ctx->Extensions.ARB_sync &&
 147                               ctx->Extensions.ARB_texture_multisample &&
 148                               ctx->Extensions.EXT_vertex_array_bgra);
 149    const GLboolean ver_3_3 = (ver_3_2 &&
 150                               ctx->Extensions.ARB_blend_func_extended &&
 151                               ctx->Extensions.ARB_explicit_attrib_location &&
 152                               ctx->Extensions.ARB_instanced_arrays &&
 153                               ctx->Extensions.ARB_occlusion_query2 &&
 154                               ctx->Extensions.ARB_sampler_objects &&
 155                               ctx->Extensions.ARB_texture_rgb10_a2ui &&
 156                               ctx->Extensions.ARB_timer_query &&
 157                               ctx->Extensions.ARB_vertex_type_2_10_10_10_rev &&
 158                               ctx->Extensions.EXT_texture_swizzle);
 159
 160    if (ver_3_3) {
 161       major = 3;
 162       minor = 3;
 163    }
 164    else if (ver_3_2) {
 165       major = 3;
 166       minor = 2;
 167    }
 168    else if (ver_3_1) {
 169       major = 3;
 170       minor = 1;
 171    }
 172    else if (ver_3_0) {
 173       major = 3;
 174       minor = 0;
 175    }
 176    else if (ver_2_1) {
 177       major = 2;
 178       minor = 1;
 179    }
 180    else if (ver_2_0) {
 181       major = 2;
 182       minor = 0;
 183    }
 184    else if (ver_1_5) {
 185       major = 1;
 186       minor = 5;
 187    }
 188    else if (ver_1_4) {
 189       major = 1;
 190       minor = 4;
 191    }
 192    else if (ver_1_3) {
 193       major = 1;
 194       minor = 3;
 195    }
 196    else {
 197       major = 1;
 198       minor = 2;
 199    }
 200
 201    ctx->VersionMajor = major;
 202    ctx->VersionMinor = minor;
 203
 204    override_version(ctx, &ctx->VersionMajor, &ctx->VersionMinor);
 205
 206    ctx->VersionString = (char *) malloc(max);
 207    if (ctx->VersionString) {
 208       _mesa_snprintf(ctx->VersionString, max,
 209                      "%u.%u Mesa " MESA_VERSION_STRING
 210 #ifdef MESA_GIT_SHA1
 211                      " (" MESA_GIT_SHA1 ")"
 212 #endif
 213                      ,
 214                      ctx->VersionMajor, ctx->VersionMinor);
 215    }
 216 }
 217
 218 static void
 219 compute_version_es1(struct gl_context *ctx)
 220 {
 221    static const int max = 100;
 222
 223    /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
 224    const GLboolean ver_1_0 = (ctx->Extensions.ARB_multitexture &&
 225                               ctx->Extensions.EXT_texture_env_add &&
 226                               ctx->Extensions.ARB_texture_env_combine &&
 227                               ctx->Extensions.ARB_texture_env_dot3);
 228    /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
 229    const GLboolean ver_1_1 = (ver_1_0 &&
 230                               ctx->Extensions.EXT_point_parameters);
 231
 232    if (ver_1_1) {
 233       ctx->VersionMajor = 1;
 234       ctx->VersionMinor = 1;
 235    } else if (ver_1_0) {
 236       ctx->VersionMajor = 1;
 237       ctx->VersionMinor = 0;
 238    } else {
 239       _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
 240    }
 241
 242    ctx->VersionString = (char *) malloc(max);
 243    if (ctx->VersionString) {
 244       _mesa_snprintf(ctx->VersionString, max,
 245                      "OpenGL ES-CM 1.%d Mesa " MESA_VERSION_STRING,
 246                      ctx->VersionMinor);
 247    }
 248 }
 249
 250 static void
 251 compute_version_es2(struct gl_context *ctx)
 252 {
 253    static const int max = 100;
 254
 255    /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
 256    const GLboolean ver_2_0 = (ctx->Extensions.ARB_multitexture &&
 257                               ctx->Extensions.ARB_texture_cube_map &&
 258                               ctx->Extensions.ARB_texture_mirrored_repeat &&
 259                               ctx->Extensions.EXT_blend_color &&
 260                               ctx->Extensions.EXT_blend_func_separate &&
 261                               ctx->Extensions.EXT_blend_minmax &&
 262                               ctx->Extensions.EXT_blend_subtract &&
 263                               ctx->Extensions.EXT_stencil_wrap &&
 264                               ctx->Extensions.ARB_shader_objects &&
 265                               ctx->Extensions.ARB_vertex_shader &&
 266                               ctx->Extensions.ARB_fragment_shader &&
 267                               ctx->Extensions.ARB_texture_non_power_of_two &&
 268                               ctx->Extensions.EXT_blend_equation_separate);
 269    if (ver_2_0) {
 270       ctx->VersionMajor = 2;
 271       ctx->VersionMinor = 0;
 272    } else {
 273       _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
 274    }
 275
 276    ctx->VersionString = (char *) malloc(max);
 277    if (ctx->VersionString) {
 278       _mesa_snprintf(ctx->VersionString, max,
 279                      "OpenGL ES 2.0 Mesa " MESA_VERSION_STRING);
 280    }
 281 }
 282
 283 /**
 284  * Set the context's VersionMajor, VersionMinor, VersionString fields.
 285  * This should only be called once as part of context initialization
 286  * or to perform version check for GLX_ARB_create_context_profile.
 287  */
 288 void
 289 _mesa_compute_version(struct gl_context *ctx)
 290 {
 291    if (ctx->VersionMajor)
 292       return;
 293
 294    switch (ctx->API) {
 295    case API_OPENGL:
 296       compute_version(ctx);
 297       break;
 298    case API_OPENGLES:
 299       compute_version_es1(ctx);
 300       break;
 301    case API_OPENGLES2:
 302       compute_version_es2(ctx);
 303       break;
 304    }
 305
 306 }