/* * Copyright 2015 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #ifndef GrContextOptions_DEFINED #define GrContextOptions_DEFINED #include "SkData.h" #include "SkTypes.h" #include "GrTypes.h" #include "../private/GrTypesPriv.h" #include "GrDriverBugWorkarounds.h" #include class SkExecutor; #if SK_SUPPORT_GPU struct SK_API GrContextOptions { enum class Enable { /** Forces an option to be disabled. */ kNo, /** Forces an option to be enabled. */ kYes, /** * Uses Skia's default behavior, which may use runtime properties (e.g. driver version). */ kDefault }; /** * Abstract class which stores Skia data in a cache that persists between sessions. Currently, * Skia stores compiled shader binaries (only when glProgramBinary / glGetProgramBinary are * supported) when provided a persistent cache, but this may extend to other data in the future. */ class SK_API PersistentCache { public: virtual ~PersistentCache() {} /** * Returns the data for the key if it exists in the cache, otherwise returns null. */ virtual sk_sp load(const SkData& key) = 0; virtual void store(const SkData& key, const SkData& data) = 0; }; GrContextOptions() {} // Suppress prints for the GrContext. bool fSuppressPrints = false; /** Overrides: These options override feature detection using backend API queries. These overrides can only reduce the feature set or limits, never increase them beyond the detected values. */ int fMaxTextureSizeOverride = SK_MaxS32; /** the threshold in bytes above which we will use a buffer mapping API to map vertex and index buffers to CPU memory in order to update them. A value of -1 means the GrContext should deduce the optimal value for this platform. */ int fBufferMapThreshold = -1; /** * Executor to handle threaded work within Ganesh. If this is nullptr, then all work will be * done serially on the main thread. To have worker threads assist with various tasks, set this * to a valid SkExecutor instance. Currently, used for software path rendering, but may be used * for other tasks. */ SkExecutor* fExecutor = nullptr; /** Construct mipmaps manually, via repeated downsampling draw-calls. This is used when the driver's implementation (glGenerateMipmap) contains bugs. This requires mipmap level and LOD control (ie desktop or ES3). */ bool fDoManualMipmapping = false; /** * Disables the coverage counting path renderer. Coverage counting can sometimes cause new * rendering artifacts along shared edges if care isn't taken to ensure both contours wind in * the same direction. */ bool fDisableCoverageCountingPaths = false; /** * Disables distance field rendering for paths. Distance field computation can be expensive, * and yields no benefit if a path is not rendered multiple times with different transforms. */ bool fDisableDistanceFieldPaths = false; /** * If true this allows path mask textures to be cached. This is only really useful if paths * are commonly rendered at the same scale and fractional translation. */ bool fAllowPathMaskCaching = true; /** * If true, the GPU will not be used to perform YUV -> RGB conversion when generating * textures from codec-backed images. */ bool fDisableGpuYUVConversion = false; /** * The maximum size of cache textures used for Skia's Glyph cache. */ size_t fGlyphCacheTextureMaximumBytes = 2048 * 1024 * 4; /** * Below this threshold size in device space distance field fonts won't be used. Distance field * fonts don't support hinting which is more important at smaller sizes. A negative value means * use the default threshold. */ float fMinDistanceFieldFontSize = -1.f; /** * Above this threshold size in device space glyphs are drawn as individual paths. A negative * value means use the default threshold. */ float fGlyphsAsPathsFontSize = -1.f; /** * Can the glyph atlas use multiple textures. If allowed, the each texture's size is bound by * fGlypheCacheTextureMaximumBytes. */ Enable fAllowMultipleGlyphCacheTextures = Enable::kDefault; /** * Bugs on certain drivers cause stencil buffers to leak. This flag causes Skia to avoid * allocating stencil buffers and use alternate rasterization paths, avoiding the leak. */ bool fAvoidStencilBuffers = false; /** * If true, texture fetches from mip-mapped textures will be biased to read larger MIP levels. * This has the effect of sharpening those textures, at the cost of some aliasing, and possible * performance impact. */ bool fSharpenMipmappedTextures = false; /** * Enables driver workaround to use draws instead of HW clears, e.g. glClear on the GL backend. */ Enable fUseDrawInsteadOfClear = Enable::kDefault; /** * Allow Ganesh to explicitly allocate resources at flush time rather than incrementally while * drawing. This will eventually just be the way it is but, for now, it is optional. */ Enable fExplicitlyAllocateGPUResources = Enable::kDefault; /** * Allow Ganesh to sort the opLists prior to allocating resources. This is an optional * behavior that is only relevant when 'fExplicitlyAllocateGPUResources' is enabled. * Eventually this will just be what is done and will not be optional. */ Enable fSortRenderTargets = Enable::kDefault; /** * Allow Ganesh to more aggressively reorder operations. This is an optional * behavior that is only relevant when 'fSortRenderTargets' is enabled. * Eventually this will just be what is done and will not be optional. */ Enable fReduceOpListSplitting = Enable::kDefault; /** * Some ES3 contexts report the ES2 external image extension, but not the ES3 version. * If support for external images is critical, enabling this option will cause Ganesh to limit * shaders to the ES2 shading language in that situation. */ bool fPreferExternalImagesOverES3 = false; /** * Disables correctness workarounds that are enabled for particular GPUs, OSes, or drivers. * This does not affect code path choices that are made for perfomance reasons nor does it * override other GrContextOption settings. */ bool fDisableDriverCorrectnessWorkarounds = false; /** * Cache in which to store compiled shader binaries between runs. */ PersistentCache* fPersistentCache = nullptr; /** * This affects the usage of the PersistentCache. If this is set to true GLSL shader strings * rather than GL program binaries will be cached. It is intended to be used when the driver's * binary loading/storing is believed to have bugs. Caching GLSL strings still saves a * significant amount of CPU work when a GL program is created. */ bool fDisallowGLSLBinaryCaching = false; #if GR_TEST_UTILS /** * Private options that are only meant for testing within Skia's tools. */ /** * If non-zero, overrides the maximum size of a tile for sw-backed images and bitmaps rendered * by SkGpuDevice. */ int fMaxTileSizeOverride = 0; /** * Prevents use of dual source blending, to test that all xfer modes work correctly without it. */ bool fSuppressDualSourceBlending = false; /** * If true, the caps will never report driver support for path rendering. */ bool fSuppressPathRendering = false; /** * If true, the caps will never support geometry shaders. */ bool fSuppressGeometryShaders = false; /** * Render everything in wireframe */ bool fWireframeMode = false; /** * Include or exclude specific GPU path renderers. */ GpuPathRenderers fGpuPathRenderers = GpuPathRenderers::kAll; #endif #if SK_SUPPORT_ATLAS_TEXT /** * Controls whether distance field glyph vertices always have 3 components even when the view * matrix does not have perspective. */ Enable fDistanceFieldGlyphVerticesAlwaysHaveW = Enable::kDefault; #endif GrDriverBugWorkarounds fDriverBugWorkarounds; }; #else struct GrContextOptions { struct PersistentCache {}; }; #endif #endif