michael@0: /*
michael@0:  * Copyright 2012 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #include "GrGLCaps.h"
michael@0: #include "GrGLContext.h"
michael@0: #include "SkTSearch.h"
michael@0: #include "SkTSort.h"
michael@0: 
michael@0: GrGLCaps::GrGLCaps() {
michael@0:     this->reset();
michael@0: }
michael@0: 
michael@0: void GrGLCaps::reset() {
michael@0:     INHERITED::reset();
michael@0: 
michael@0:     fVerifiedColorConfigs.reset();
michael@0:     fStencilFormats.reset();
michael@0:     fStencilVerifiedColorConfigs.reset();
michael@0:     fMSFBOType = kNone_MSFBOType;
michael@0:     fFBFetchType = kNone_FBFetchType;
michael@0:     fMaxFragmentUniformVectors = 0;
michael@0:     fMaxVertexAttributes = 0;
michael@0:     fMaxFragmentTextureUnits = 0;
michael@0:     fMaxFixedFunctionTextureCoords = 0;
michael@0:     fRGBA8RenderbufferSupport = false;
michael@0:     fBGRAFormatSupport = false;
michael@0:     fBGRAIsInternalFormat = false;
michael@0:     fTextureSwizzleSupport = false;
michael@0:     fUnpackRowLengthSupport = false;
michael@0:     fUnpackFlipYSupport = false;
michael@0:     fPackRowLengthSupport = false;
michael@0:     fPackFlipYSupport = false;
michael@0:     fTextureUsageSupport = false;
michael@0:     fTexStorageSupport = false;
michael@0:     fTextureRedSupport = false;
michael@0:     fImagingSupport = false;
michael@0:     fTwoFormatLimit = false;
michael@0:     fFragCoordsConventionSupport = false;
michael@0:     fVertexArrayObjectSupport = false;
michael@0:     fUseNonVBOVertexAndIndexDynamicData = false;
michael@0:     fIsCoreProfile = false;
michael@0:     fFixedFunctionSupport = false;
michael@0:     fDiscardFBSupport = false;
michael@0:     fFullClearIsFree = false;
michael@0: }
michael@0: 
michael@0: GrGLCaps::GrGLCaps(const GrGLCaps& caps) : GrDrawTargetCaps() {
michael@0:     *this = caps;
michael@0: }
michael@0: 
michael@0: GrGLCaps& GrGLCaps::operator = (const GrGLCaps& caps) {
michael@0:     INHERITED::operator=(caps);
michael@0:     fVerifiedColorConfigs = caps.fVerifiedColorConfigs;
michael@0:     fStencilFormats = caps.fStencilFormats;
michael@0:     fStencilVerifiedColorConfigs = caps.fStencilVerifiedColorConfigs;
michael@0:     fMaxFragmentUniformVectors = caps.fMaxFragmentUniformVectors;
michael@0:     fMaxVertexAttributes = caps.fMaxVertexAttributes;
michael@0:     fMaxFragmentTextureUnits = caps.fMaxFragmentTextureUnits;
michael@0:     fMaxFixedFunctionTextureCoords = caps.fMaxFixedFunctionTextureCoords;
michael@0:     fMSFBOType = caps.fMSFBOType;
michael@0:     fFBFetchType = caps.fFBFetchType;
michael@0:     fRGBA8RenderbufferSupport = caps.fRGBA8RenderbufferSupport;
michael@0:     fBGRAFormatSupport = caps.fBGRAFormatSupport;
michael@0:     fBGRAIsInternalFormat = caps.fBGRAIsInternalFormat;
michael@0:     fTextureSwizzleSupport = caps.fTextureSwizzleSupport;
michael@0:     fUnpackRowLengthSupport = caps.fUnpackRowLengthSupport;
michael@0:     fUnpackFlipYSupport = caps.fUnpackFlipYSupport;
michael@0:     fPackRowLengthSupport = caps.fPackRowLengthSupport;
michael@0:     fPackFlipYSupport = caps.fPackFlipYSupport;
michael@0:     fTextureUsageSupport = caps.fTextureUsageSupport;
michael@0:     fTexStorageSupport = caps.fTexStorageSupport;
michael@0:     fTextureRedSupport = caps.fTextureRedSupport;
michael@0:     fImagingSupport = caps.fImagingSupport;
michael@0:     fTwoFormatLimit = caps.fTwoFormatLimit;
michael@0:     fFragCoordsConventionSupport = caps.fFragCoordsConventionSupport;
michael@0:     fVertexArrayObjectSupport = caps.fVertexArrayObjectSupport;
michael@0:     fUseNonVBOVertexAndIndexDynamicData = caps.fUseNonVBOVertexAndIndexDynamicData;
michael@0:     fIsCoreProfile = caps.fIsCoreProfile;
michael@0:     fFixedFunctionSupport = caps.fFixedFunctionSupport;
michael@0:     fDiscardFBSupport = caps.fDiscardFBSupport;
michael@0:     fFullClearIsFree = caps.fFullClearIsFree;
michael@0: 
michael@0:     return *this;
michael@0: }
michael@0: 
michael@0: void GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
michael@0: 
michael@0:     this->reset();
michael@0:     if (!ctxInfo.isInitialized()) {
michael@0:         return;
michael@0:     }
michael@0: 
michael@0:     GrGLStandard standard = ctxInfo.standard();
michael@0:     GrGLVersion version = ctxInfo.version();
michael@0: 
michael@0:     /**************************************************************************
michael@0:      * Caps specific to GrGLCaps
michael@0:      **************************************************************************/
michael@0: 
michael@0:     if (kGLES_GrGLStandard == standard) {
michael@0:         GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_VECTORS,
michael@0:                           &fMaxFragmentUniformVectors);
michael@0:     } else {
michael@0:         SkASSERT(kGL_GrGLStandard == standard);
michael@0:         GrGLint max;
michael@0:         GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &max);
michael@0:         fMaxFragmentUniformVectors = max / 4;
michael@0:         if (version >= GR_GL_VER(3, 2)) {
michael@0:             GrGLint profileMask;
michael@0:             GR_GL_GetIntegerv(gli, GR_GL_CONTEXT_PROFILE_MASK, &profileMask);
michael@0:             fIsCoreProfile = SkToBool(profileMask & GR_GL_CONTEXT_CORE_PROFILE_BIT);
michael@0:         }
michael@0:         if (!fIsCoreProfile) {
michael@0:             fFixedFunctionSupport = true;
michael@0:             GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_COORDS, &fMaxFixedFunctionTextureCoords);
michael@0:             // Sanity check
michael@0:             SkASSERT(fMaxFixedFunctionTextureCoords > 0 && fMaxFixedFunctionTextureCoords < 128);
michael@0:         }
michael@0:     }
michael@0:     GR_GL_GetIntegerv(gli, GR_GL_MAX_VERTEX_ATTRIBS, &fMaxVertexAttributes);
michael@0:     GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_IMAGE_UNITS, &fMaxFragmentTextureUnits);
michael@0: 
michael@0:     if (kGL_GrGLStandard == standard) {
michael@0:         fRGBA8RenderbufferSupport = true;
michael@0:     } else {
michael@0:         fRGBA8RenderbufferSupport = version >= GR_GL_VER(3,0) ||
michael@0:                                     ctxInfo.hasExtension("GL_OES_rgb8_rgba8") ||
michael@0:                                     ctxInfo.hasExtension("GL_ARM_rgba8");
michael@0:     }
michael@0: 
michael@0:     if (kGL_GrGLStandard == standard) {
michael@0:         fBGRAFormatSupport = version >= GR_GL_VER(1,2) ||
michael@0:                              ctxInfo.hasExtension("GL_EXT_bgra");
michael@0:     } else {
michael@0:         if (ctxInfo.hasExtension("GL_APPLE_texture_format_BGRA8888")) {
michael@0:             fBGRAFormatSupport = true;
michael@0:         } else if (ctxInfo.hasExtension("GL_EXT_texture_format_BGRA8888")) {
michael@0:             fBGRAFormatSupport = true;
michael@0:             fBGRAIsInternalFormat = true;
michael@0:         }
michael@0:         SkASSERT(fBGRAFormatSupport ||
michael@0:                  kSkia8888_GrPixelConfig != kBGRA_8888_GrPixelConfig);
michael@0:     }
michael@0: 
michael@0:     if (kGL_GrGLStandard == standard) {
michael@0:         fTextureSwizzleSupport = version >= GR_GL_VER(3,3) ||
michael@0:                                  ctxInfo.hasExtension("GL_ARB_texture_swizzle");
michael@0:     } else {
michael@0:         fTextureSwizzleSupport = version >= GR_GL_VER(3,0);
michael@0:     }
michael@0: 
michael@0:     if (kGL_GrGLStandard == standard) {
michael@0:         fUnpackRowLengthSupport = true;
michael@0:         fUnpackFlipYSupport = false;
michael@0:         fPackRowLengthSupport = true;
michael@0:         fPackFlipYSupport = false;
michael@0:     } else {
michael@0:         fUnpackRowLengthSupport = version >= GR_GL_VER(3,0) ||
michael@0:                                   ctxInfo.hasExtension("GL_EXT_unpack_subimage");
michael@0:         fUnpackFlipYSupport = ctxInfo.hasExtension("GL_CHROMIUM_flipy");
michael@0:         fPackRowLengthSupport = version >= GR_GL_VER(3,0) ||
michael@0:                                 ctxInfo.hasExtension("GL_NV_pack_subimage");
michael@0:         fPackFlipYSupport =
michael@0:             ctxInfo.hasExtension("GL_ANGLE_pack_reverse_row_order");
michael@0:     }
michael@0: 
michael@0:     fTextureUsageSupport = (kGLES_GrGLStandard == standard) &&
michael@0:                             ctxInfo.hasExtension("GL_ANGLE_texture_usage");
michael@0: 
michael@0:     if (kGL_GrGLStandard == standard) {
michael@0:         // The EXT version can apply to either GL or GLES.
michael@0:         fTexStorageSupport = version >= GR_GL_VER(4,2) ||
michael@0:                              ctxInfo.hasExtension("GL_ARB_texture_storage") ||
michael@0:                              ctxInfo.hasExtension("GL_EXT_texture_storage");
michael@0:     } else {
michael@0:         // Qualcomm Adreno drivers appear to have issues with texture storage.
michael@0:         fTexStorageSupport = (version >= GR_GL_VER(3,0) &&
michael@0:                               kQualcomm_GrGLVendor != ctxInfo.vendor()) ||
michael@0:                              ctxInfo.hasExtension("GL_EXT_texture_storage");
michael@0:     }
michael@0: 
michael@0:     // ARB_texture_rg is part of OpenGL 3.0, but mesa doesn't support it if
michael@0:     // it doesn't have ARB_texture_rg extension.
michael@0:     if (kGL_GrGLStandard == standard) {
michael@0:         if (ctxInfo.isMesa()) {
michael@0:             fTextureRedSupport = ctxInfo.hasExtension("GL_ARB_texture_rg");
michael@0:         } else {
michael@0:             fTextureRedSupport = version >= GR_GL_VER(3,0) ||
michael@0:                                  ctxInfo.hasExtension("GL_ARB_texture_rg");
michael@0:         }
michael@0:     } else {
michael@0:         fTextureRedSupport =  version >= GR_GL_VER(3,0) ||
michael@0:                               ctxInfo.hasExtension("GL_EXT_texture_rg");
michael@0:     }
michael@0: 
michael@0:     fImagingSupport = kGL_GrGLStandard == standard &&
michael@0:                       ctxInfo.hasExtension("GL_ARB_imaging");
michael@0: 
michael@0:     // ES 2 only guarantees RGBA/uchar + one other format/type combo for
michael@0:     // ReadPixels. The other format has to checked at run-time since it
michael@0:     // can change based on which render target is bound
michael@0:     fTwoFormatLimit = kGLES_GrGLStandard == standard;
michael@0: 
michael@0:     // Known issue on at least some Intel platforms:
michael@0:     // http://code.google.com/p/skia/issues/detail?id=946
michael@0:     if (kIntel_GrGLVendor != ctxInfo.vendor()) {
michael@0:         fFragCoordsConventionSupport = ctxInfo.glslGeneration() >= k150_GrGLSLGeneration ||
michael@0:                                        ctxInfo.hasExtension("GL_ARB_fragment_coord_conventions");
michael@0:     }
michael@0: 
michael@0:     // SGX and Mali GPUs that are based on a tiled-deferred architecture that have trouble with
michael@0:     // frequently changing VBOs. We've measured a performance increase using non-VBO vertex
michael@0:     // data for dynamic content on these GPUs. Perhaps we should read the renderer string and
michael@0:     // limit this decision to specific GPU families rather than basing it on the vendor alone.
michael@0:     if (!GR_GL_MUST_USE_VBO &&
michael@0:         (kARM_GrGLVendor == ctxInfo.vendor() || kImagination_GrGLVendor == ctxInfo.vendor())) {
michael@0:         fUseNonVBOVertexAndIndexDynamicData = true;
michael@0:     }
michael@0: 
michael@0:     fDiscardFBSupport = ctxInfo.hasExtension("GL_EXT_discard_framebuffer");
michael@0: 
michael@0:     if (kARM_GrGLVendor == ctxInfo.vendor() || kImagination_GrGLVendor == ctxInfo.vendor()) {
michael@0:         fFullClearIsFree = true;
michael@0:     }
michael@0: 
michael@0:     if (kGL_GrGLStandard == standard) {
michael@0:         fVertexArrayObjectSupport = version >= GR_GL_VER(3, 0) ||
michael@0:                                     ctxInfo.hasExtension("GL_ARB_vertex_array_object");
michael@0:     } else {
michael@0:         fVertexArrayObjectSupport = version >= GR_GL_VER(3, 0) ||
michael@0:                                     ctxInfo.hasExtension("GL_OES_vertex_array_object");
michael@0:     }
michael@0: 
michael@0:     if (kGLES_GrGLStandard == standard) {
michael@0:         if (ctxInfo.hasExtension("GL_EXT_shader_framebuffer_fetch")) {
michael@0:             fFBFetchType = kEXT_FBFetchType;
michael@0:         } else if (ctxInfo.hasExtension("GL_NV_shader_framebuffer_fetch")) {
michael@0:             fFBFetchType = kNV_FBFetchType;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     this->initFSAASupport(ctxInfo, gli);
michael@0:     this->initStencilFormats(ctxInfo);
michael@0: 
michael@0:     /**************************************************************************
michael@0:      * GrDrawTargetCaps fields
michael@0:      **************************************************************************/
michael@0:     GrGLint numFormats;
michael@0:     GR_GL_GetIntegerv(gli, GR_GL_NUM_COMPRESSED_TEXTURE_FORMATS, &numFormats);
michael@0:     if (numFormats) {
michael@0:         SkAutoSTMalloc<10, GrGLint> formats(numFormats);
michael@0:         GR_GL_GetIntegerv(gli, GR_GL_COMPRESSED_TEXTURE_FORMATS, formats);
michael@0:         for (int i = 0; i < numFormats; ++i) {
michael@0:             if (formats[i] == GR_GL_PALETTE8_RGBA8) {
michael@0:                 f8BitPaletteSupport = true;
michael@0:                 break;
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     if (kGL_GrGLStandard == standard) {
michael@0:         // we could also look for GL_ATI_separate_stencil extension or
michael@0:         // GL_EXT_stencil_two_side but they use different function signatures
michael@0:         // than GL2.0+ (and than each other).
michael@0:         fTwoSidedStencilSupport = (ctxInfo.version() >= GR_GL_VER(2,0));
michael@0:         // supported on GL 1.4 and higher or by extension
michael@0:         fStencilWrapOpsSupport = (ctxInfo.version() >= GR_GL_VER(1,4)) ||
michael@0:                                   ctxInfo.hasExtension("GL_EXT_stencil_wrap");
michael@0:     } else {
michael@0:         // ES 2 has two sided stencil and stencil wrap
michael@0:         fTwoSidedStencilSupport = true;
michael@0:         fStencilWrapOpsSupport = true;
michael@0:     }
michael@0: 
michael@0:     if (kGL_GrGLStandard == standard) {
michael@0:         fBufferLockSupport = true; // we require VBO support and the desktop VBO extension includes
michael@0:                                    // glMapBuffer.
michael@0:     } else {
michael@0:         fBufferLockSupport = ctxInfo.hasExtension("GL_OES_mapbuffer");
michael@0:     }
michael@0: 
michael@0:     if (kGL_GrGLStandard == standard) {
michael@0:         SkASSERT(ctxInfo.version() >= GR_GL_VER(2,0) ||
michael@0:                  ctxInfo.hasExtension("GL_ARB_texture_non_power_of_two"));
michael@0:         fNPOTTextureTileSupport = true;
michael@0:         fMipMapSupport = true;
michael@0:     } else {
michael@0:         // Unextended ES2 supports NPOT textures with clamp_to_edge and non-mip filters only
michael@0:         // ES3 has no limitations.
michael@0:         fNPOTTextureTileSupport = ctxInfo.version() >= GR_GL_VER(3,0) ||
michael@0:                                   ctxInfo.hasExtension("GL_OES_texture_npot");
michael@0:         // ES2 supports MIP mapping for POT textures but our caps don't allow for limited MIP
michael@0:         // support. The OES extension or ES 3.0 allow for MIPS on NPOT textures. So, apparently,
michael@0:         // does the undocumented GL_IMG_texture_npot extension. This extension does not seem to
michael@0:         // to alllow arbitrary wrap modes, however.
michael@0:         fMipMapSupport = fNPOTTextureTileSupport || ctxInfo.hasExtension("GL_IMG_texture_npot");
michael@0:     }
michael@0: 
michael@0:     fHWAALineSupport = (kGL_GrGLStandard == standard);
michael@0: 
michael@0:     GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_SIZE, &fMaxTextureSize);
michael@0:     GR_GL_GetIntegerv(gli, GR_GL_MAX_RENDERBUFFER_SIZE, &fMaxRenderTargetSize);
michael@0:     // Our render targets are always created with textures as the color
michael@0:     // attachment, hence this min:
michael@0:     fMaxRenderTargetSize = GrMin(fMaxTextureSize, fMaxRenderTargetSize);
michael@0: 
michael@0:     fPathRenderingSupport = ctxInfo.hasExtension("GL_NV_path_rendering");
michael@0:     SkASSERT(!fPathRenderingSupport || fFixedFunctionSupport);
michael@0: 
michael@0:     fGpuTracingSupport = ctxInfo.hasExtension("GL_EXT_debug_marker");
michael@0: 
michael@0:     fDstReadInShaderSupport = kNone_FBFetchType != fFBFetchType;
michael@0: 
michael@0:     // Disable scratch texture reuse on Mali and Adreno devices
michael@0:     fReuseScratchTextures = kARM_GrGLVendor != ctxInfo.vendor() &&
michael@0:                             kQualcomm_GrGLVendor != ctxInfo.vendor();
michael@0: 
michael@0:     // Enable supported shader-related caps
michael@0:     if (kGL_GrGLStandard == standard) {
michael@0:         fDualSourceBlendingSupport = ctxInfo.version() >= GR_GL_VER(3,3) ||
michael@0:                                      ctxInfo.hasExtension("GL_ARB_blend_func_extended");
michael@0:         fShaderDerivativeSupport = true;
michael@0:         // we don't support GL_ARB_geometry_shader4, just GL 3.2+ GS
michael@0:         fGeometryShaderSupport = ctxInfo.version() >= GR_GL_VER(3,2) &&
michael@0:                                  ctxInfo.glslGeneration() >= k150_GrGLSLGeneration;
michael@0:     } else {
michael@0:         fShaderDerivativeSupport = ctxInfo.hasExtension("GL_OES_standard_derivatives");
michael@0:     }
michael@0: 
michael@0:     if (GrGLCaps::kES_IMG_MsToTexture_MSFBOType == fMSFBOType) {
michael@0:         GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES_IMG, &fMaxSampleCount);
michael@0:     } else if (GrGLCaps::kNone_MSFBOType != fMSFBOType) {
michael@0:         GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES, &fMaxSampleCount);
michael@0:     }
michael@0: 
michael@0:     this->initConfigRenderableTable(ctxInfo);
michael@0: }
michael@0: 
michael@0: void GrGLCaps::initConfigRenderableTable(const GrGLContextInfo& ctxInfo) {
michael@0: 
michael@0:     // OpenGL < 3.0
michael@0:     //  no support for render targets unless the GL_ARB_framebuffer_object
michael@0:     //  extension is supported (in which case we get ALPHA, RED, RG, RGB,
michael@0:     //  RGBA (ALPHA8, RGBA4, RGBA8) for OpenGL > 1.1). Note that we
michael@0:     //  probably don't get R8 in this case.
michael@0: 
michael@0:     // OpenGL 3.0
michael@0:     //  base color renderable: ALPHA, RED, RG, RGB, and RGBA
michael@0:     //  sized derivatives: ALPHA8, R8, RGBA4, RGBA8
michael@0: 
michael@0:     // >= OpenGL 3.1
michael@0:     //  base color renderable: RED, RG, RGB, and RGBA
michael@0:     //  sized derivatives: R8, RGBA4, RGBA8
michael@0:     //  if the GL_ARB_compatibility extension is supported then we get back
michael@0:     //  support for GL_ALPHA and ALPHA8
michael@0: 
michael@0:     // GL_EXT_bgra adds BGRA render targets to any version
michael@0: 
michael@0:     // ES 2.0
michael@0:     //  color renderable: RGBA4, RGB5_A1, RGB565
michael@0:     //  GL_EXT_texture_rg adds support for R8 as a color render target
michael@0:     //  GL_OES_rgb8_rgba8 and/or GL_ARM_rgba8 adds support for RGBA8
michael@0:     //  GL_EXT_texture_format_BGRA8888 and/or GL_APPLE_texture_format_BGRA8888 added BGRA support
michael@0: 
michael@0:     // ES 3.0
michael@0:     // Same as ES 2.0 except R8 and RGBA8 are supported without extensions (the functions called
michael@0:     // below already account for this).
michael@0: 
michael@0:     enum {
michael@0:         kNo_MSAA = 0,
michael@0:         kYes_MSAA = 1,
michael@0:     };
michael@0: 
michael@0:     if (kGL_GrGLStandard == ctxInfo.standard()) {
michael@0:         // Post 3.0 we will get R8
michael@0:         // Prior to 3.0 we will get ALPHA8 (with GL_ARB_framebuffer_object)
michael@0:         if (ctxInfo.version() >= GR_GL_VER(3,0) ||
michael@0:             ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
michael@0:             fConfigRenderSupport[kAlpha_8_GrPixelConfig][kNo_MSAA] = true;
michael@0:             fConfigRenderSupport[kAlpha_8_GrPixelConfig][kYes_MSAA] = true;
michael@0:         }
michael@0:     } else {
michael@0:         // On ES we can only hope for R8
michael@0:         fConfigRenderSupport[kAlpha_8_GrPixelConfig][kNo_MSAA] = fTextureRedSupport;
michael@0:         fConfigRenderSupport[kAlpha_8_GrPixelConfig][kYes_MSAA] = fTextureRedSupport;
michael@0:     }
michael@0: 
michael@0:     if (kGL_GrGLStandard != ctxInfo.standard()) {
michael@0:         // only available in ES
michael@0:         fConfigRenderSupport[kRGB_565_GrPixelConfig][kNo_MSAA] = true;
michael@0:         fConfigRenderSupport[kRGB_565_GrPixelConfig][kYes_MSAA] = true;
michael@0:     }
michael@0: 
michael@0:     // we no longer support 444 as a render target
michael@0:     fConfigRenderSupport[kRGBA_4444_GrPixelConfig][kNo_MSAA]  = false;
michael@0:     fConfigRenderSupport[kRGBA_4444_GrPixelConfig][kYes_MSAA]  = false;
michael@0: 
michael@0:     if (this->fRGBA8RenderbufferSupport) {
michael@0:         fConfigRenderSupport[kRGBA_8888_GrPixelConfig][kNo_MSAA]  = true;
michael@0:         fConfigRenderSupport[kRGBA_8888_GrPixelConfig][kYes_MSAA]  = true;
michael@0:     }
michael@0: 
michael@0:     if (this->fBGRAFormatSupport) {
michael@0:         fConfigRenderSupport[kBGRA_8888_GrPixelConfig][kNo_MSAA]  = true;
michael@0:         // The GL_EXT_texture_format_BGRA8888 extension does not add BGRA to the list of
michael@0:         // configs that are color-renderable and can be passed to glRenderBufferStorageMultisample.
michael@0:         // Chromium may have an extension to allow BGRA renderbuffers to work on desktop platforms.
michael@0:         if (ctxInfo.hasExtension("GL_CHROMIUM_renderbuffer_format_BGRA8888")) {
michael@0:             fConfigRenderSupport[kBGRA_8888_GrPixelConfig][kYes_MSAA] = true;
michael@0:         } else {
michael@0:             fConfigRenderSupport[kBGRA_8888_GrPixelConfig][kYes_MSAA] =
michael@0:                 !fBGRAIsInternalFormat || !this->usesMSAARenderBuffers();
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     // If we don't support MSAA then undo any places above where we set a config as renderable with
michael@0:     // msaa.
michael@0:     if (kNone_MSFBOType == fMSFBOType) {
michael@0:         for (int i = 0; i < kGrPixelConfigCnt; ++i) {
michael@0:             fConfigRenderSupport[i][kYes_MSAA] = false;
michael@0:         }
michael@0:     }
michael@0: }
michael@0: 
michael@0: bool GrGLCaps::readPixelsSupported(const GrGLInterface* intf,
michael@0:                                    GrGLenum format,
michael@0:                                    GrGLenum type) const {
michael@0:     if (GR_GL_RGBA == format && GR_GL_UNSIGNED_BYTE == type) {
michael@0:         // ES 2 guarantees this format is supported
michael@0:         return true;
michael@0:     }
michael@0: 
michael@0:     if (!fTwoFormatLimit) {
michael@0:         // not limited by ES 2's constraints
michael@0:         return true;
michael@0:     }
michael@0: 
michael@0:     GrGLint otherFormat = GR_GL_RGBA;
michael@0:     GrGLint otherType = GR_GL_UNSIGNED_BYTE;
michael@0: 
michael@0:     // The other supported format/type combo supported for ReadPixels
michael@0:     // can change based on which render target is bound
michael@0:     GR_GL_GetIntegerv(intf,
michael@0:                       GR_GL_IMPLEMENTATION_COLOR_READ_FORMAT,
michael@0:                       &otherFormat);
michael@0: 
michael@0:     GR_GL_GetIntegerv(intf,
michael@0:                       GR_GL_IMPLEMENTATION_COLOR_READ_TYPE,
michael@0:                       &otherType);
michael@0: 
michael@0:     return (GrGLenum)otherFormat == format && (GrGLenum)otherType == type;
michael@0: }
michael@0: 
michael@0: void GrGLCaps::initFSAASupport(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
michael@0: 
michael@0:     fMSFBOType = kNone_MSFBOType;
michael@0:     if (kGL_GrGLStandard != ctxInfo.standard()) {
michael@0:         // We prefer the EXT/IMG extension over ES3 MSAA because we've observed
michael@0:         // ES3 driver bugs on at least one device with a tiled GPU (N10).
michael@0:         if (ctxInfo.hasExtension("GL_EXT_multisampled_render_to_texture")) {
michael@0:             fMSFBOType = kES_EXT_MsToTexture_MSFBOType;
michael@0:         } else if (ctxInfo.hasExtension("GL_IMG_multisampled_render_to_texture")) {
michael@0:             fMSFBOType = kES_IMG_MsToTexture_MSFBOType;
michael@0:         } else if (ctxInfo.version() >= GR_GL_VER(3,0)) {
michael@0:             fMSFBOType = GrGLCaps::kES_3_0_MSFBOType;
michael@0:         } else if (ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_multisample")) {
michael@0:             // chrome's extension is equivalent to the EXT msaa
michael@0:             // and fbo_blit extensions.
michael@0:             fMSFBOType = kDesktop_EXT_MSFBOType;
michael@0:         } else if (ctxInfo.hasExtension("GL_APPLE_framebuffer_multisample")) {
michael@0:             fMSFBOType = kES_Apple_MSFBOType;
michael@0:         }
michael@0:     } else {
michael@0:         if ((ctxInfo.version() >= GR_GL_VER(3,0)) ||
michael@0:             ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
michael@0:             fMSFBOType = GrGLCaps::kDesktop_ARB_MSFBOType;
michael@0:         } else if (ctxInfo.hasExtension("GL_EXT_framebuffer_multisample") &&
michael@0:                    ctxInfo.hasExtension("GL_EXT_framebuffer_blit")) {
michael@0:             fMSFBOType = GrGLCaps::kDesktop_EXT_MSFBOType;
michael@0:         }
michael@0:     }
michael@0: }
michael@0: 
michael@0: namespace {
michael@0: const GrGLuint kUnknownBitCount = GrGLStencilBuffer::kUnknownBitCount;
michael@0: }
michael@0: 
michael@0: void GrGLCaps::initStencilFormats(const GrGLContextInfo& ctxInfo) {
michael@0: 
michael@0:     // Build up list of legal stencil formats (though perhaps not supported on
michael@0:     // the particular gpu/driver) from most preferred to least.
michael@0: 
michael@0:     // these consts are in order of most preferred to least preferred
michael@0:     // we don't bother with GL_STENCIL_INDEX1 or GL_DEPTH32F_STENCIL8
michael@0: 
michael@0:     static const StencilFormat
michael@0:                   // internal Format      stencil bits      total bits        packed?
michael@0:         gS8    = {GR_GL_STENCIL_INDEX8,   8,                8,                false},
michael@0:         gS16   = {GR_GL_STENCIL_INDEX16,  16,               16,               false},
michael@0:         gD24S8 = {GR_GL_DEPTH24_STENCIL8, 8,                32,               true },
michael@0:         gS4    = {GR_GL_STENCIL_INDEX4,   4,                4,                false},
michael@0:     //  gS     = {GR_GL_STENCIL_INDEX,    kUnknownBitCount, kUnknownBitCount, false},
michael@0:         gDS    = {GR_GL_DEPTH_STENCIL,    kUnknownBitCount, kUnknownBitCount, true };
michael@0: 
michael@0:     if (kGL_GrGLStandard == ctxInfo.standard()) {
michael@0:         bool supportsPackedDS =
michael@0:             ctxInfo.version() >= GR_GL_VER(3,0) ||
michael@0:             ctxInfo.hasExtension("GL_EXT_packed_depth_stencil") ||
michael@0:             ctxInfo.hasExtension("GL_ARB_framebuffer_object");
michael@0: 
michael@0:         // S1 thru S16 formats are in GL 3.0+, EXT_FBO, and ARB_FBO since we
michael@0:         // require FBO support we can expect these are legal formats and don't
michael@0:         // check. These also all support the unsized GL_STENCIL_INDEX.
michael@0:         fStencilFormats.push_back() = gS8;
michael@0:         fStencilFormats.push_back() = gS16;
michael@0:         if (supportsPackedDS) {
michael@0:             fStencilFormats.push_back() = gD24S8;
michael@0:         }
michael@0:         fStencilFormats.push_back() = gS4;
michael@0:         if (supportsPackedDS) {
michael@0:             fStencilFormats.push_back() = gDS;
michael@0:         }
michael@0:     } else {
michael@0:         // ES2 has STENCIL_INDEX8 without extensions but requires extensions
michael@0:         // for other formats.
michael@0:         // ES doesn't support using the unsized format.
michael@0: 
michael@0:         fStencilFormats.push_back() = gS8;
michael@0:         //fStencilFormats.push_back() = gS16;
michael@0:         if (ctxInfo.version() >= GR_GL_VER(3,0) ||
michael@0:             ctxInfo.hasExtension("GL_OES_packed_depth_stencil")) {
michael@0:             fStencilFormats.push_back() = gD24S8;
michael@0:         }
michael@0:         if (ctxInfo.hasExtension("GL_OES_stencil4")) {
michael@0:             fStencilFormats.push_back() = gS4;
michael@0:         }
michael@0:     }
michael@0:     SkASSERT(0 == fStencilVerifiedColorConfigs.count());
michael@0:     fStencilVerifiedColorConfigs.push_back_n(fStencilFormats.count());
michael@0: }
michael@0: 
michael@0: void GrGLCaps::markColorConfigAndStencilFormatAsVerified(
michael@0:                                     GrPixelConfig config,
michael@0:                                     const GrGLStencilBuffer::Format& format) {
michael@0: #if !GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT
michael@0:     return;
michael@0: #endif
michael@0:     SkASSERT((unsigned)config < (unsigned)kGrPixelConfigCnt);
michael@0:     SkASSERT(fStencilFormats.count() == fStencilVerifiedColorConfigs.count());
michael@0:     int count = fStencilFormats.count();
michael@0:     // we expect a really small number of possible formats so linear search
michael@0:     // should be OK
michael@0:     SkASSERT(count < 16);
michael@0:     for (int i = 0; i < count; ++i) {
michael@0:         if (format.fInternalFormat ==
michael@0:             fStencilFormats[i].fInternalFormat) {
michael@0:             fStencilVerifiedColorConfigs[i].markVerified(config);
michael@0:             return;
michael@0:         }
michael@0:     }
michael@0:     GrCrash("Why are we seeing a stencil format that "
michael@0:             "GrGLCaps doesn't know about.");
michael@0: }
michael@0: 
michael@0: bool GrGLCaps::isColorConfigAndStencilFormatVerified(
michael@0:                                 GrPixelConfig config,
michael@0:                                 const GrGLStencilBuffer::Format& format) const {
michael@0: #if !GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT
michael@0:     return false;
michael@0: #endif
michael@0:     SkASSERT((unsigned)config < (unsigned)kGrPixelConfigCnt);
michael@0:     int count = fStencilFormats.count();
michael@0:     // we expect a really small number of possible formats so linear search
michael@0:     // should be OK
michael@0:     SkASSERT(count < 16);
michael@0:     for (int i = 0; i < count; ++i) {
michael@0:         if (format.fInternalFormat ==
michael@0:             fStencilFormats[i].fInternalFormat) {
michael@0:             return fStencilVerifiedColorConfigs[i].isVerified(config);
michael@0:         }
michael@0:     }
michael@0:     GrCrash("Why are we seeing a stencil format that "
michael@0:             "GLCaps doesn't know about.");
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: SkString GrGLCaps::dump() const {
michael@0: 
michael@0:     SkString r = INHERITED::dump();
michael@0: 
michael@0:     r.appendf("--- GL-Specific ---\n");
michael@0:     for (int i = 0; i < fStencilFormats.count(); ++i) {
michael@0:         r.appendf("Stencil Format %d, stencil bits: %02d, total bits: %02d\n",
michael@0:                  i,
michael@0:                  fStencilFormats[i].fStencilBits,
michael@0:                  fStencilFormats[i].fTotalBits);
michael@0:     }
michael@0: 
michael@0:     static const char* kMSFBOExtStr[] = {
michael@0:         "None",
michael@0:         "ARB",
michael@0:         "EXT",
michael@0:         "ES 3.0",
michael@0:         "Apple",
michael@0:         "IMG MS To Texture",
michael@0:         "EXT MS To Texture",
michael@0:     };
michael@0:     GR_STATIC_ASSERT(0 == kNone_MSFBOType);
michael@0:     GR_STATIC_ASSERT(1 == kDesktop_ARB_MSFBOType);
michael@0:     GR_STATIC_ASSERT(2 == kDesktop_EXT_MSFBOType);
michael@0:     GR_STATIC_ASSERT(3 == kES_3_0_MSFBOType);
michael@0:     GR_STATIC_ASSERT(4 == kES_Apple_MSFBOType);
michael@0:     GR_STATIC_ASSERT(5 == kES_IMG_MsToTexture_MSFBOType);
michael@0:     GR_STATIC_ASSERT(6 == kES_EXT_MsToTexture_MSFBOType);
michael@0:     GR_STATIC_ASSERT(GR_ARRAY_COUNT(kMSFBOExtStr) == kLast_MSFBOType + 1);
michael@0: 
michael@0:     static const char* kFBFetchTypeStr[] = {
michael@0:         "None",
michael@0:         "EXT",
michael@0:         "NV",
michael@0:     };
michael@0:     GR_STATIC_ASSERT(0 == kNone_FBFetchType);
michael@0:     GR_STATIC_ASSERT(1 == kEXT_FBFetchType);
michael@0:     GR_STATIC_ASSERT(2 == kNV_FBFetchType);
michael@0:     GR_STATIC_ASSERT(GR_ARRAY_COUNT(kFBFetchTypeStr) == kLast_FBFetchType + 1);
michael@0: 
michael@0: 
michael@0:     r.appendf("Core Profile: %s\n", (fIsCoreProfile ? "YES" : "NO"));
michael@0:     r.appendf("Fixed Function Support: %s\n", (fFixedFunctionSupport ? "YES" : "NO"));
michael@0:     r.appendf("MSAA Type: %s\n", kMSFBOExtStr[fMSFBOType]);
michael@0:     r.appendf("FB Fetch Type: %s\n", kFBFetchTypeStr[fFBFetchType]);
michael@0:     r.appendf("Max FS Uniform Vectors: %d\n", fMaxFragmentUniformVectors);
michael@0:     r.appendf("Max FS Texture Units: %d\n", fMaxFragmentTextureUnits);
michael@0:     if (fFixedFunctionSupport) {
michael@0:         r.appendf("Max Fixed Function Texture Coords: %d\n", fMaxFixedFunctionTextureCoords);
michael@0:     }
michael@0:     r.appendf("Max Vertex Attributes: %d\n", fMaxVertexAttributes);
michael@0:     r.appendf("Support RGBA8 Render Buffer: %s\n", (fRGBA8RenderbufferSupport ? "YES": "NO"));
michael@0:     r.appendf("BGRA support: %s\n", (fBGRAFormatSupport ? "YES": "NO"));
michael@0:     r.appendf("BGRA is an internal format: %s\n", (fBGRAIsInternalFormat ? "YES": "NO"));
michael@0:     r.appendf("Support texture swizzle: %s\n", (fTextureSwizzleSupport ? "YES": "NO"));
michael@0:     r.appendf("Unpack Row length support: %s\n", (fUnpackRowLengthSupport ? "YES": "NO"));
michael@0:     r.appendf("Unpack Flip Y support: %s\n", (fUnpackFlipYSupport ? "YES": "NO"));
michael@0:     r.appendf("Pack Row length support: %s\n", (fPackRowLengthSupport ? "YES": "NO"));
michael@0:     r.appendf("Pack Flip Y support: %s\n", (fPackFlipYSupport ? "YES": "NO"));
michael@0: 
michael@0:     r.appendf("Texture Usage support: %s\n", (fTextureUsageSupport ? "YES": "NO"));
michael@0:     r.appendf("Texture Storage support: %s\n", (fTexStorageSupport ? "YES": "NO"));
michael@0:     r.appendf("GL_R support: %s\n", (fTextureRedSupport ? "YES": "NO"));
michael@0:     r.appendf("GL_ARB_imaging support: %s\n", (fImagingSupport ? "YES": "NO"));
michael@0:     r.appendf("Two Format Limit: %s\n", (fTwoFormatLimit ? "YES": "NO"));
michael@0:     r.appendf("Fragment coord conventions support: %s\n",
michael@0:              (fFragCoordsConventionSupport ? "YES": "NO"));
michael@0:     r.appendf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
michael@0:     r.appendf("Use non-VBO for dynamic data: %s\n",
michael@0:              (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
michael@0:     r.appendf("Discard FrameBuffer support: %s\n", (fDiscardFBSupport ? "YES" : "NO"));
michael@0:     r.appendf("Full screen clear is free: %s\n", (fFullClearIsFree ? "YES" : "NO"));
michael@0:     return r;
michael@0: }