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