/*
* 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 OR COPYRIGHT HOLDERS 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 <stdio.h>
#include "imports.h"
#include "mtypes.h"
#include "version.h"
#include "git_sha1.h"
/**
* Scans 'string' to see if it ends with 'ending'.
*/
static bool
check_for_ending(const char *string, const char *ending)
{
const size_t len1
= strlen(string
); const size_t len2
= strlen(ending
);
if (len2 > len1)
return false;
return strcmp(string
+ (len1
- len2
), ending
) == 0; }
/**
* Returns the gl override data
*
* version > 0 indicates there is an override requested
* fwd_context is only valid if version > 0
*/
static void
get_gl_override(int *version, bool *fwd_context, bool *compat_context)
{
const char *env_var = "MESA_GL_VERSION_OVERRIDE";
const char *version_str;
int major, minor, n;
static int override_version = -1;
static bool fc_suffix = false;
static bool compat_suffix = false;
if (override_version < 0) {
override_version = 0;
version_str
= getenv(env_var
); if (version_str) {
fc_suffix = check_for_ending(version_str, "FC");
compat_suffix = check_for_ending(version_str, "COMPAT");
n
= sscanf(version_str
, "%u.%u", &major
, &minor
); if (n != 2) {
fprintf(stderr
, "error: invalid value for %s: %s\n", env_var, version_str);
override_version = 0;
} else {
override_version = major * 10 + minor;
if (override_version < 30 && fc_suffix) {
fprintf(stderr
, "error: invalid value for %s: %s\n", env_var, version_str);
}
}
}
}
*version = override_version;
*fwd_context = fc_suffix;
*compat_context = compat_suffix;
}
/**
* Builds the MESA version string.
*/
static void
create_version_string(struct gl_context *ctx, const char *prefix)
{
static const int max = 100;
ctx
->VersionString
= malloc(max
); if (ctx->VersionString) {
_mesa_snprintf(ctx->VersionString, max,
"%s%u.%u%s Mesa " PACKAGE_VERSION
#ifdef MESA_GIT_SHA1
" (" MESA_GIT_SHA1 ")"
#endif
,
prefix,
ctx->Version / 10, ctx->Version % 10,
(ctx->API == API_OPENGL_CORE) ? " (Core Profile)" : ""
);
}
}
/**
* Override the context's version and/or API type if the
* environment variable MESA_GL_VERSION_OVERRIDE is set.
*
* Example uses of MESA_GL_VERSION_OVERRIDE:
*
* 2.1: select a compatibility (non-Core) profile with GL version 2.1
* 3.0: select a compatibility (non-Core) profile with GL version 3.0
* 3.0FC: select a Core+Forward Compatible profile with GL version 3.0
* 3.1: select a Core profile with GL version 3.1
* 3.1FC: select a Core+Forward Compatible profile with GL version 3.1
*/
bool
_mesa_override_gl_version_contextless(struct gl_constants *consts,
gl_api *apiOut, GLuint *versionOut)
{
int version;
bool fwd_context, compat_context;
get_gl_override(&version, &fwd_context, &compat_context);
if (version > 0) {
*versionOut = version;
if (version >= 30 && fwd_context) {
*apiOut = API_OPENGL_CORE;
consts->ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
} else if (version >= 31 && !compat_context) {
*apiOut = API_OPENGL_CORE;
} else {
*apiOut = API_OPENGL_COMPAT;
}
return true;
}
return false;
}
void
_mesa_override_gl_version(struct gl_context *ctx)
{
if (_mesa_override_gl_version_contextless(&ctx->Const, &ctx->API,
&ctx->Version)) {
create_version_string(ctx, "");
}
}
/**
* Returns the gl override value
*
* version > 0 indicates there is an override requested
*/
int
_mesa_get_gl_version_override(void)
{
int version;
bool fwd_context, compat_context;
get_gl_override(&version, &fwd_context, &compat_context);
return version;
}
/**
* 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_constants *consts)
{
const char *env_var = "MESA_GLSL_VERSION_OVERRIDE";
const char *version;
int n;
if (!version) {
return;
}
n
= sscanf(version
, "%u", &consts
->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 GLuint
compute_version(const struct gl_extensions *extensions,
const struct gl_constants *consts, gl_api api)
{
GLuint major, minor, version;
const bool ver_1_3 = (extensions->ARB_texture_border_clamp &&
extensions->ARB_texture_cube_map &&
extensions->ARB_texture_env_combine &&
extensions->ARB_texture_env_dot3);
const bool ver_1_4 = (ver_1_3 &&
extensions->ARB_depth_texture &&
extensions->ARB_shadow &&
extensions->ARB_texture_env_crossbar &&
extensions->EXT_blend_color &&
extensions->EXT_blend_func_separate &&
extensions->EXT_blend_minmax &&
extensions->EXT_point_parameters);
const bool ver_1_5 = (ver_1_4 &&
extensions->ARB_occlusion_query);
const bool ver_2_0 = (ver_1_5 &&
extensions->ARB_point_sprite &&
extensions->ARB_vertex_shader &&
extensions->ARB_fragment_shader &&
extensions->ARB_texture_non_power_of_two &&
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.
*/
(extensions->EXT_stencil_two_side
|| extensions->ATI_separate_stencil));
const bool ver_2_1 = (ver_2_0 &&
extensions->EXT_pixel_buffer_object &&
extensions->EXT_texture_sRGB);
const bool ver_3_0 = (ver_2_1 &&
consts->GLSLVersion >= 130 &&
(consts->MaxSamples >= 4 || consts->FakeSWMSAA) &&
(api == API_OPENGL_CORE ||
extensions->ARB_color_buffer_float) &&
extensions->ARB_depth_buffer_float &&
extensions->ARB_half_float_vertex &&
extensions->ARB_map_buffer_range &&
extensions->ARB_shader_texture_lod &&
extensions->ARB_texture_float &&
extensions->ARB_texture_rg &&
extensions->ARB_texture_compression_rgtc &&
extensions->EXT_draw_buffers2 &&
extensions->ARB_framebuffer_object &&
extensions->EXT_framebuffer_sRGB &&
extensions->EXT_packed_float &&
extensions->EXT_texture_array &&
extensions->EXT_texture_shared_exponent &&
extensions->EXT_transform_feedback &&
extensions->NV_conditional_render);
const bool ver_3_1 = (ver_3_0 &&
consts->GLSLVersion >= 140 &&
extensions->ARB_draw_instanced &&
extensions->ARB_texture_buffer_object &&
extensions->ARB_uniform_buffer_object &&
extensions->EXT_texture_snorm &&
extensions->NV_primitive_restart &&
extensions->NV_texture_rectangle &&
consts->Program[MESA_SHADER_VERTEX].MaxTextureImageUnits >= 16);
const bool ver_3_2 = (ver_3_1 &&
consts->GLSLVersion >= 150 &&
extensions->ARB_depth_clamp &&
extensions->ARB_draw_elements_base_vertex &&
extensions->ARB_fragment_coord_conventions &&
extensions->EXT_provoking_vertex &&
extensions->ARB_seamless_cube_map &&
extensions->ARB_sync &&
extensions->ARB_texture_multisample &&
extensions->EXT_vertex_array_bgra);
const bool ver_3_3 = (ver_3_2 &&
consts->GLSLVersion >= 330 &&
extensions->ARB_blend_func_extended &&
extensions->ARB_explicit_attrib_location &&
extensions->ARB_instanced_arrays &&
extensions->ARB_occlusion_query2 &&
extensions->ARB_shader_bit_encoding &&
extensions->ARB_texture_rgb10_a2ui &&
extensions->ARB_timer_query &&
extensions->ARB_vertex_type_2_10_10_10_rev &&
extensions->EXT_texture_swizzle);
/* ARB_sampler_objects is always enabled in mesa */
const bool ver_4_0 = (ver_3_3 &&
consts->GLSLVersion >= 400 &&
extensions->ARB_draw_buffers_blend &&
extensions->ARB_draw_indirect &&
extensions->ARB_gpu_shader5 &&
extensions->ARB_gpu_shader_fp64 &&
extensions->ARB_sample_shading &&
false /*extensions->ARB_shader_subroutine*/ &&
extensions->ARB_tessellation_shader &&
extensions->ARB_texture_buffer_object_rgb32 &&
extensions->ARB_texture_cube_map_array &&
extensions->ARB_texture_query_lod &&
extensions->ARB_transform_feedback2 &&
extensions->ARB_transform_feedback3);
const bool ver_4_1 = (ver_4_0 &&
consts->GLSLVersion >= 410 &&
extensions->ARB_ES2_compatibility &&
extensions->ARB_shader_precision &&
extensions->ARB_vertex_attrib_64bit &&
extensions->ARB_viewport_array);
const bool ver_4_2 = (ver_4_1 &&
consts->GLSLVersion >= 420 &&
extensions->ARB_base_instance &&
extensions->ARB_conservative_depth &&
extensions->ARB_internalformat_query &&
extensions->ARB_shader_atomic_counters &&
extensions->ARB_shader_image_load_store &&
extensions->ARB_shading_language_420pack &&
extensions->ARB_shading_language_packing &&
extensions->ARB_texture_compression_bptc &&
extensions->ARB_transform_feedback_instanced);
if (ver_4_2) {
major = 4;
minor = 2;
}
else if (ver_4_1) {
major = 4;
minor = 1;
}
else if (ver_4_0) {
major = 4;
minor = 0;
}
else 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;
}
version = major * 10 + minor;
if (api == API_OPENGL_CORE && version < 31)
return 0;
return version;
}
static GLuint
compute_version_es1(const struct gl_extensions *extensions)
{
/* OpenGL ES 1.0 is derived from OpenGL 1.3 */
const bool ver_1_0 = (extensions->ARB_texture_env_combine &&
extensions->ARB_texture_env_dot3);
/* OpenGL ES 1.1 is derived from OpenGL 1.5 */
const bool ver_1_1 = (ver_1_0 &&
extensions->EXT_point_parameters);
if (ver_1_1) {
return 11;
} else if (ver_1_0) {
return 10;
} else {
return 0;
}
}
static GLuint
compute_version_es2(const struct gl_extensions *extensions)
{
/* OpenGL ES 2.0 is derived from OpenGL 2.0 */
const bool ver_2_0 = (extensions->ARB_texture_cube_map &&
extensions->EXT_blend_color &&
extensions->EXT_blend_func_separate &&
extensions->EXT_blend_minmax &&
extensions->ARB_vertex_shader &&
extensions->ARB_fragment_shader &&
extensions->ARB_texture_non_power_of_two &&
extensions->EXT_blend_equation_separate);
/* FINISHME: This list isn't quite right. */
const bool ver_3_0 = (extensions->ARB_half_float_vertex &&
extensions->ARB_internalformat_query &&
extensions->ARB_map_buffer_range &&
extensions->ARB_shader_texture_lod &&
extensions->ARB_texture_float &&
extensions->ARB_texture_rg &&
extensions->ARB_depth_buffer_float &&
extensions->EXT_draw_buffers2 &&
/* extensions->ARB_framebuffer_object && */
extensions->EXT_framebuffer_sRGB &&
extensions->EXT_packed_float &&
extensions->EXT_texture_array &&
extensions->EXT_texture_shared_exponent &&
extensions->EXT_transform_feedback &&
extensions->ARB_draw_instanced &&
extensions->ARB_uniform_buffer_object &&
extensions->EXT_texture_snorm &&
extensions->NV_primitive_restart &&
extensions->OES_depth_texture_cube_map);
if (ver_3_0) {
return 30;
} else if (ver_2_0) {
return 20;
} else {
return 0;
}
}
GLuint
_mesa_get_version(const struct gl_extensions *extensions,
struct gl_constants *consts, gl_api api)
{
switch (api) {
case API_OPENGL_COMPAT:
/* Disable GLSL 1.40 and later for legacy contexts.
* This disallows creation of the GL 3.1 compatibility context. */
if (consts->GLSLVersion > 130) {
consts->GLSLVersion = 130;
}
/* fall through */
case API_OPENGL_CORE:
return compute_version(extensions, consts, api);
case API_OPENGLES:
return compute_version_es1(extensions);
case API_OPENGLES2:
return compute_version_es2(extensions);
}
return 0;
}
/**
* Set the context's Version and 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->Version)
return;
ctx->Version = _mesa_get_version(&ctx->Extensions, &ctx->Const, ctx->API);
/* Make sure that the GLSL version lines up with the GL version. In some
* cases it can be too high, e.g. if an extension is missing.
*/
if (ctx->API == API_OPENGL_CORE) {
switch (ctx->Version) {
case 31:
ctx->Const.GLSLVersion = 140;
break;
case 32:
ctx->Const.GLSLVersion = 150;
break;
default:
ctx->Const.GLSLVersion = ctx->Version * 10;
break;
}
}
switch (ctx->API) {
case API_OPENGL_COMPAT:
case API_OPENGL_CORE:
create_version_string(ctx, "");
break;
case API_OPENGLES:
if (!ctx->Version) {
_mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
return;
}
create_version_string(ctx, "OpenGL ES-CM ");
break;
case API_OPENGLES2:
if (!ctx->Version) {
_mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
return;
}
create_version_string(ctx, "OpenGL ES ");
break;
}
}