gecko-dev/gfx/gl/GLContextFeatures.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "GLContext.h"
#include "nsPrintfCString.h"
#ifdef XP_MACOSX
#include "nsCocoaFeatures.h"
#endif
namespace mozilla {
namespace gl {
const size_t kMAX_EXTENSION_GROUP_SIZE = 5;
// ARB_ES2_compatibility is natively supported in OpenGL 4.1.
static const unsigned int kGLCoreVersionForES2Compat = 410;
// ARB_ES3_compatibility is natively supported in OpenGL 4.3.
static const unsigned int kGLCoreVersionForES3Compat = 430;
struct FeatureInfo
{
const char* mName;
/* The (desktop) OpenGL version that provides this feature */
unsigned int mOpenGLVersion;
/* The OpenGL ES version that provides this feature */
unsigned int mOpenGLESVersion;
/* If there is an ARB extension, and its function symbols are
* not decorated with an ARB suffix, then its extension ID should go
* here, and NOT in mExtensions. For example, ARB_vertex_array_object
* functions do not have an ARB suffix, because it is an extension that
* was created to match core GL functionality and will never differ.
* Some ARB extensions do have a suffix, if they were created before
* a core version of the functionality existed.
*
* If there is no such ARB extension, pass 0 (GLContext::Extension_None)
*/
GLContext::GLExtensions mARBExtensionWithoutARBSuffix;
/* Extensions that also provide this feature */
GLContext::GLExtensions mExtensions[kMAX_EXTENSION_GROUP_SIZE];
};
static const FeatureInfo sFeatureInfoArr[] = {
{
"bind_buffer_offset",
0, // OpenGL version
0, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::EXT_transform_feedback,
GLContext::NV_transform_feedback,
GLContext::Extensions_End
}
},
{
"blend_minmax",
200, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::EXT_blend_minmax,
GLContext::Extensions_End
}
},
{
"depth_texture",
200, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_depth_texture,
GLContext::OES_depth_texture,
// Intentionally avoid putting ANGLE_depth_texture here,
// it does not offer quite the same functionality.
GLContext::Extensions_End
}
},
{
"draw_buffers",
200, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_draw_buffers,
GLContext::EXT_draw_buffers,
GLContext::Extensions_End
}
},
{
"draw_instanced",
310, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_draw_instanced,
GLContext::EXT_draw_instanced,
GLContext::NV_draw_instanced,
GLContext::ANGLE_instanced_arrays,
GLContext::Extensions_End
}
},
{
"draw_range_elements",
120, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::EXT_draw_range_elements,
GLContext::Extensions_End
}
},
{
"element_index_uint",
200, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::OES_element_index_uint,
GLContext::Extensions_End
}
},
{
"ES2_compatibility",
kGLCoreVersionForES2Compat,
200, // OpenGL ES version
GLContext::ARB_ES2_compatibility, // no suffix on ARB extension
{
GLContext::Extensions_End
}
},
{
"ES3_compatibility",
kGLCoreVersionForES3Compat,
300, // OpenGL ES version
GLContext::ARB_ES3_compatibility, // no suffix on ARB extension
{
GLContext::Extensions_End
}
},
{
// Removes clamping for float color outputs from frag shaders.
"frag_color_float",
300, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_color_buffer_float,
GLContext::EXT_color_buffer_float,
GLContext::EXT_color_buffer_half_float,
GLContext::Extensions_End
}
},
{
"frag_depth",
200, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::EXT_frag_depth,
GLContext::Extensions_End
}
},
{
"framebuffer_blit",
300, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::EXT_framebuffer_blit,
GLContext::ANGLE_framebuffer_blit,
GLContext::Extensions_End
}
},
{
"framebuffer_multisample",
300, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::EXT_framebuffer_multisample,
GLContext::ANGLE_framebuffer_multisample,
GLContext::Extensions_End
}
},
{
"framebuffer_object",
300, // OpenGL version
200, // OpenGL ES version
GLContext::ARB_framebuffer_object,
{
GLContext::EXT_framebuffer_object,
GLContext::Extensions_End
}
},
{
"get_query_object_iv",
200, // OpenGL version
0, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::Extensions_End
}
/*
* XXX_get_query_object_iv only provide GetQueryObjectiv provided by
* ARB_occlusion_query (added by OpenGL 2.0).
*/
},
{
"instanced_arrays",
330, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_instanced_arrays,
GLContext::NV_instanced_arrays,
GLContext::ANGLE_instanced_arrays,
GLContext::Extensions_End
}
},
{
"instanced_non_arrays",
330, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_instanced_arrays,
GLContext::Extensions_End
}
/* This is an expanded version of `instanced_arrays` that allows for all
* enabled active attrib arrays to have non-zero divisors.
* ANGLE_instanced_arrays and NV_instanced_arrays forbid this, but GLES3
* has no such restriction.
*/
},
{
"occlusion_query",
200, // OpenGL version
0, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::Extensions_End
}
// XXX_occlusion_query depend on ARB_occlusion_query (added in OpenGL 2.0)
},
{
"occlusion_query_boolean",
kGLCoreVersionForES3Compat,
300, // OpenGL ES version
GLContext::ARB_ES3_compatibility,
{
GLContext::EXT_occlusion_query_boolean,
GLContext::Extensions_End
}
/*
* XXX_occlusion_query_boolean provide ANY_SAMPLES_PASSED_CONSERVATIVE,
* but EXT_occlusion_query_boolean is only a OpenGL ES extension. But
* it is supported on desktop if ARB_ES3_compatibility because
* EXT_occlusion_query_boolean (added in OpenGL ES 3.0).
*/
},
{
"occlusion_query2",
330, // = min(330, kGLCoreVersionForES3Compat),
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_occlusion_query2,
GLContext::ARB_ES3_compatibility,
GLContext::EXT_occlusion_query_boolean,
GLContext::Extensions_End
}
/*
* XXX_occlusion_query2 (add in OpenGL 3.3) provide ANY_SAMPLES_PASSED,
* which is provided by ARB_occlusion_query2, EXT_occlusion_query_boolean
* (added in OpenGL ES 3.0) and ARB_ES3_compatibility
*/
},
{
"packed_depth_stencil",
300, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::EXT_packed_depth_stencil,
GLContext::OES_packed_depth_stencil,
GLContext::Extensions_End
}
},
{
"query_objects",
200, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::EXT_occlusion_query_boolean,
GLContext::Extensions_End
}
/*
* XXX_query_objects only provide entry points commonly supported by
* ARB_occlusion_query (added in OpenGL 2.0) and EXT_occlusion_query_boolean
* (added in OpenGL ES 3.0)
*/
},
{
"renderbuffer_float",
300, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_texture_float,
GLContext::EXT_color_buffer_float,
GLContext::Extensions_End
}
},
{
"renderbuffer_half_float",
300, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_texture_float,
GLContext::EXT_color_buffer_half_float,
GLContext::Extensions_End
}
},
{
"robustness",
0, // OpenGL version
0, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_robustness,
GLContext::EXT_robustness,
GLContext::Extensions_End
}
},
{
"sRGB",
300, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::EXT_sRGB,
GLContext::Extensions_End
}
},
{
"standard_derivatives",
200, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::OES_standard_derivatives,
GLContext::Extensions_End
}
},
{
"texture_float",
300, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_texture_float,
GLContext::OES_texture_float,
GLContext::Extensions_End
}
},
{
"texture_float_linear",
310, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_texture_float,
GLContext::OES_texture_float_linear,
GLContext::Extensions_End
}
},
{
"texture_half_float",
300, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_half_float_pixel,
GLContext::ARB_texture_float,
GLContext::NV_half_float,
GLContext::Extensions_End
}
/**
* We are not including OES_texture_half_float in this feature, because:
* GL_HALF_FLOAT = 0x140B
* GL_HALF_FLOAT_ARB = 0x140B == GL_HALF_FLOAT
* GL_HALF_FLOAT_NV = 0x140B == GL_HALF_FLOAT
* GL_HALF_FLOAT_OES = 0x8D61 != GL_HALF_FLOAT
* WebGL handles this specifically with an OES_texture_half_float check.
*/
},
{
"texture_half_float_linear",
310, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_half_float_pixel,
GLContext::ARB_texture_float,
GLContext::NV_half_float,
GLContext::OES_texture_half_float_linear,
GLContext::Extensions_End
}
},
{
"texture_non_power_of_two",
200, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::ARB_texture_non_power_of_two,
GLContext::OES_texture_npot,
GLContext::Extensions_End
}
},
{
"transform_feedback",
300, // OpenGL version
300, // OpenGL ES version
GLContext::Extension_None,
{
GLContext::EXT_transform_feedback,
GLContext::NV_transform_feedback,
GLContext::Extensions_End
}
},
{
"vertex_array_object",
300, // OpenGL version
300, // OpenGL ES version
GLContext::ARB_vertex_array_object, // ARB extension
{
GLContext::OES_vertex_array_object,
GLContext::APPLE_vertex_array_object,
GLContext::Extensions_End
}
}
};
static inline const FeatureInfo&
GetFeatureInfo(GLFeature feature)
{
static_assert(MOZ_ARRAY_LENGTH(sFeatureInfoArr) == size_t(GLFeature::EnumMax),
"Mismatched lengths for sFeatureInfoInfos and GLFeature enums");
MOZ_ASSERT(feature < GLFeature::EnumMax,
"GLContext::GetFeatureInfoInfo : unknown <feature>");
return sFeatureInfoArr[size_t(feature)];
}
static inline uint32_t
ProfileVersionForFeature(GLFeature feature, ContextProfile profile)
{
MOZ_ASSERT(profile != ContextProfile::Unknown,
"GLContext::ProfileVersionForFeature : unknown <profile>");
const FeatureInfo& featureInfo = GetFeatureInfo(feature);
if (profile == ContextProfile::OpenGLES) {
return featureInfo.mOpenGLESVersion;
}
return featureInfo.mOpenGLVersion;
}
bool
IsFeaturePartOfProfileVersion(GLFeature feature,
ContextProfile profile, unsigned int version)
{
unsigned int profileVersion = ProfileVersionForFeature(feature, profile);
/**
* if `profileVersion` is zero, it means that no version of the profile
* added support for the feature.
*/
return profileVersion && version >= profileVersion;
}
bool
GLContext::IsFeatureProvidedByCoreSymbols(GLFeature feature)
{
if (IsFeaturePartOfProfileVersion(feature, mProfile, mVersion))
return true;
if (IsExtensionSupported(GetFeatureInfo(feature).mARBExtensionWithoutARBSuffix))
return true;
return false;
}
const char*
GLContext::GetFeatureName(GLFeature feature)
{
return GetFeatureInfo(feature).mName;
}
static bool
CanReadSRGBFromFBOTexture(GLContext* gl)
{
if (!gl->WorkAroundDriverBugs())
return true;
#ifdef XP_MACOSX
// Bug 843668:
// MacOSX 10.6 reports to support EXT_framebuffer_sRGB and
// EXT_texture_sRGB but fails to convert from sRGB to linear
// when writing to an sRGB texture attached to an FBO.
if (!nsCocoaFeatures::OnLionOrLater()) {
return false;
}
#endif // XP_MACOSX
return true;
}
void
GLContext::InitFeatures()
{
for (size_t feature_index = 0; feature_index < size_t(GLFeature::EnumMax); feature_index++)
{
GLFeature feature = GLFeature(feature_index);
if (IsFeaturePartOfProfileVersion(feature, mProfile, mVersion)) {
mAvailableFeatures[feature_index] = true;
continue;
}
mAvailableFeatures[feature_index] = false;
const FeatureInfo& featureInfo = GetFeatureInfo(feature);
if (IsExtensionSupported(featureInfo.mARBExtensionWithoutARBSuffix))
{
mAvailableFeatures[feature_index] = true;
continue;
}
for (size_t j = 0; true; j++)
{
MOZ_ASSERT(j < kMAX_EXTENSION_GROUP_SIZE, "kMAX_EXTENSION_GROUP_SIZE too small");
if (featureInfo.mExtensions[j] == GLContext::Extensions_End) {
break;
}
if (IsExtensionSupported(featureInfo.mExtensions[j])) {
mAvailableFeatures[feature_index] = true;
break;
}
}
}
// Bug 843668: Work around limitation of the feature system.
// For sRGB support under OpenGL to match OpenGL ES spec, check for both
// EXT_texture_sRGB and EXT_framebuffer_sRGB is required.
const bool aresRGBExtensionsAvailable =
IsExtensionSupported(EXT_texture_sRGB) &&
(IsExtensionSupported(ARB_framebuffer_sRGB) ||
IsExtensionSupported(EXT_framebuffer_sRGB));
mAvailableFeatures[size_t(GLFeature::sRGB)] =
aresRGBExtensionsAvailable &&
CanReadSRGBFromFBOTexture(this);
}
void
GLContext::MarkUnsupported(GLFeature feature)
{
mAvailableFeatures[size_t(feature)] = false;
const FeatureInfo& featureInfo = GetFeatureInfo(feature);
for (size_t i = 0; true; i++)
{
MOZ_ASSERT(i < kMAX_EXTENSION_GROUP_SIZE, "kMAX_EXTENSION_GROUP_SIZE too small");
if (featureInfo.mExtensions[i] == GLContext::Extensions_End) {
break;
}
MarkExtensionUnsupported(featureInfo.mExtensions[i]);
}
MOZ_ASSERT(!IsSupported(feature), "GLContext::MarkUnsupported has failed!");
NS_WARNING(nsPrintfCString("%s marked as unsupported", GetFeatureName(feature)).get());
}
} /* namespace gl */
} /* namespace mozilla */