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/*
* Mesa 3-D graphics library
*
* Copyright (C) 2010 VMware, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "imports.h"
#include "mtypes.h"
#include "version.h"
#include "git_sha1.h"
/**
* Override the context's GL version if the environment variable
* MESA_GL_VERSION_OVERRIDE is set. Valid values of MESA_GL_VERSION_OVERRIDE
* are point-separated version numbers, such as "3.0".
*/
static void
override_version(struct gl_context *ctx, GLuint *major, GLuint *minor)
{
const char *env_var = "MESA_GL_VERSION_OVERRIDE";
const char *version;
int n;
version = getenv(env_var);
if (!version) {
return;
}
n = sscanf(version, "%u.%u", major, minor);
if (n != 2) {
fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
return;
}
}
/**
* Override the context's GLSL version if the environment variable
* MESA_GLSL_VERSION_OVERRIDE is set. Valid values for
* MESA_GLSL_VERSION_OVERRIDE are integers, such as "130".
*/
void
_mesa_override_glsl_version(struct gl_context *ctx)
{
const char *env_var = "MESA_GLSL_VERSION_OVERRIDE";
const char *version;
int n;
version = getenv(env_var);
if (!version) {
return;
}
n = sscanf(version, "%u", &ctx->Const.GLSLVersion);
if (n != 1) {
fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
return;
}
}
/**
* Examine enabled GL extensions to determine GL version.
*/
static void
compute_version(struct gl_context *ctx)
{
GLuint major, minor;
static const int max = 100;
const GLboolean ver_1_3 = (ctx->Extensions.ARB_texture_border_clamp &&
ctx->Extensions.ARB_texture_cube_map &&
ctx->Extensions.ARB_texture_env_combine &&
ctx->Extensions.ARB_texture_env_dot3);
const GLboolean ver_1_4 = (ver_1_3 &&
ctx->Extensions.ARB_depth_texture &&
ctx->Extensions.ARB_shadow &&
ctx->Extensions.ARB_texture_env_crossbar &&
ctx->Extensions.ARB_window_pos &&
ctx->Extensions.EXT_blend_color &&
ctx->Extensions.EXT_blend_func_separate &&
ctx->Extensions.EXT_blend_minmax &&
ctx->Extensions.EXT_fog_coord &&
ctx->Extensions.EXT_point_parameters &&
ctx->Extensions.EXT_secondary_color);
const GLboolean ver_1_5 = (ver_1_4 &&
ctx->Extensions.ARB_occlusion_query &&
ctx->Extensions.EXT_shadow_funcs);
const GLboolean ver_2_0 = (ver_1_5 &&
ctx->Extensions.ARB_point_sprite &&
ctx->Extensions.ARB_shader_objects &&
ctx->Extensions.ARB_vertex_shader &&
ctx->Extensions.ARB_fragment_shader &&
ctx->Extensions.ARB_texture_non_power_of_two &&
ctx->Extensions.EXT_blend_equation_separate &&
/* Technically, 2.0 requires the functionality
* of the EXT version. Enable 2.0 if either
* extension is available, and assume that a
* driver that only exposes the ATI extension
* will fallback to software when necessary.
*/
(ctx->Extensions.EXT_stencil_two_side
|| ctx->Extensions.ATI_separate_stencil));
const GLboolean ver_2_1 = (ver_2_0 &&
ctx->Const.GLSLVersion >= 120 &&
ctx->Extensions.EXT_pixel_buffer_object &&
ctx->Extensions.EXT_texture_sRGB);
const GLboolean ver_3_0 = (ver_2_1 &&
ctx->Const.GLSLVersion >= 130 &&
ctx->Const.MaxSamples >= 4 &&
ctx->Extensions.ARB_color_buffer_float &&
ctx->Extensions.ARB_depth_buffer_float &&
ctx->Extensions.ARB_half_float_pixel &&
ctx->Extensions.ARB_half_float_vertex &&
ctx->Extensions.ARB_map_buffer_range &&
ctx->Extensions.ARB_shader_texture_lod &&
ctx->Extensions.ARB_texture_float &&
ctx->Extensions.ARB_texture_rg &&
ctx->Extensions.ARB_texture_compression_rgtc &&
ctx->Extensions.APPLE_vertex_array_object &&
ctx->Extensions.EXT_draw_buffers2 &&
ctx->Extensions.ARB_framebuffer_object &&
ctx->Extensions.EXT_framebuffer_sRGB &&
ctx->Extensions.EXT_packed_float &&
ctx->Extensions.EXT_texture_array &&
ctx->Extensions.EXT_texture_shared_exponent &&
ctx->Extensions.EXT_transform_feedback &&
ctx->Extensions.NV_conditional_render);
const GLboolean ver_3_1 = (ver_3_0 &&
ctx->Const.GLSLVersion >= 140 &&
ctx->Extensions.ARB_copy_buffer &&
ctx->Extensions.ARB_draw_instanced &&
ctx->Extensions.ARB_texture_buffer_object &&
ctx->Extensions.ARB_uniform_buffer_object &&
ctx->Extensions.EXT_texture_snorm &&
ctx->Extensions.NV_primitive_restart &&
ctx->Extensions.NV_texture_rectangle &&
ctx->Const.MaxVertexTextureImageUnits >= 16);
const GLboolean ver_3_2 = (ver_3_1 &&
ctx->Const.GLSLVersion >= 150 &&
ctx->Extensions.ARB_depth_clamp &&
ctx->Extensions.ARB_draw_elements_base_vertex &&
ctx->Extensions.ARB_fragment_coord_conventions &&
ctx->Extensions.ARB_geometry_shader4 &&
ctx->Extensions.EXT_provoking_vertex &&
ctx->Extensions.ARB_seamless_cube_map &&
ctx->Extensions.ARB_sync &&
ctx->Extensions.ARB_texture_multisample &&
ctx->Extensions.EXT_vertex_array_bgra);
const GLboolean ver_3_3 = (ver_3_2 &&
ctx->Const.GLSLVersion >= 330 &&
ctx->Extensions.ARB_blend_func_extended &&
ctx->Extensions.ARB_explicit_attrib_location &&
ctx->Extensions.ARB_instanced_arrays &&
ctx->Extensions.ARB_occlusion_query2 &&
ctx->Extensions.ARB_sampler_objects &&
ctx->Extensions.ARB_shader_bit_encoding &&
ctx->Extensions.ARB_texture_rgb10_a2ui &&
ctx->Extensions.ARB_timer_query &&
ctx->Extensions.ARB_vertex_type_2_10_10_10_rev &&
ctx->Extensions.EXT_texture_swizzle);
if (ver_3_3) {
major = 3;
minor = 3;
}
else if (ver_3_2) {
major = 3;
minor = 2;
}
else if (ver_3_1) {
major = 3;
minor = 1;
}
else if (ver_3_0) {
major = 3;
minor = 0;
}
else if (ver_2_1) {
major = 2;
minor = 1;
}
else if (ver_2_0) {
major = 2;
minor = 0;
}
else if (ver_1_5) {
major = 1;
minor = 5;
}
else if (ver_1_4) {
major = 1;
minor = 4;
}
else if (ver_1_3) {
major = 1;
minor = 3;
}
else {
major = 1;
minor = 2;
}
ctx->VersionMajor = major;
ctx->VersionMinor = minor;
override_version(ctx, &ctx->VersionMajor, &ctx->VersionMinor);
ctx->VersionString = (char *) malloc(max);
if (ctx->VersionString) {
_mesa_snprintf(ctx->VersionString, max,
"%u.%u Mesa " MESA_VERSION_STRING
#ifdef MESA_GIT_SHA1
" (" MESA_GIT_SHA1 ")"
#endif
,
ctx->VersionMajor, ctx->VersionMinor);
}
}
static void
compute_version_es1(struct gl_context *ctx)
{
static const int max = 100;
/* OpenGL ES 1.0 is derived from OpenGL 1.3 */
const GLboolean ver_1_0 = (ctx->Extensions.ARB_texture_env_combine &&
ctx->Extensions.ARB_texture_env_dot3);
/* OpenGL ES 1.1 is derived from OpenGL 1.5 */
const GLboolean ver_1_1 = (ver_1_0 &&
ctx->Extensions.EXT_point_parameters);
if (ver_1_1) {
ctx->VersionMajor = 1;
ctx->VersionMinor = 1;
} else if (ver_1_0) {
ctx->VersionMajor = 1;
ctx->VersionMinor = 0;
} else {
_mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
}
ctx->VersionString = (char *) malloc(max);
if (ctx->VersionString) {
_mesa_snprintf(ctx->VersionString, max,
"OpenGL ES-CM 1.%d Mesa " MESA_VERSION_STRING
#ifdef MESA_GIT_SHA1
" (" MESA_GIT_SHA1 ")"
#endif
,
ctx->VersionMinor);
}
}
static void
compute_version_es2(struct gl_context *ctx)
{
static const int max = 100;
/* OpenGL ES 2.0 is derived from OpenGL 2.0 */
const GLboolean ver_2_0 = (ctx->Extensions.ARB_texture_cube_map &&
ctx->Extensions.EXT_blend_color &&
ctx->Extensions.EXT_blend_func_separate &&
ctx->Extensions.EXT_blend_minmax &&
ctx->Extensions.ARB_shader_objects &&
ctx->Extensions.ARB_vertex_shader &&
ctx->Extensions.ARB_fragment_shader &&
ctx->Extensions.ARB_texture_non_power_of_two &&
ctx->Extensions.EXT_blend_equation_separate);
if (ver_2_0) {
ctx->VersionMajor = 2;
ctx->VersionMinor = 0;
} else {
_mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
}
ctx->VersionString = (char *) malloc(max);
if (ctx->VersionString) {
_mesa_snprintf(ctx->VersionString, max,
"OpenGL ES 2.0 Mesa " MESA_VERSION_STRING
#ifdef MESA_GIT_SHA1
" (" MESA_GIT_SHA1 ")"
#endif
);
}
}
/**
* Set the context's VersionMajor, VersionMinor, VersionString fields.
* This should only be called once as part of context initialization
* or to perform version check for GLX_ARB_create_context_profile.
*/
void
_mesa_compute_version(struct gl_context *ctx)
{
if (ctx->VersionMajor)
return;
switch (ctx->API) {
case API_OPENGL:
case API_OPENGL_CORE:
compute_version(ctx);
break;
case API_OPENGLES:
compute_version_es1(ctx);
break;
case API_OPENGLES2:
compute_version_es2(ctx);
break;
}
}
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