/* * Copyright 2011 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #ifndef GrGLConfig_DEFINED #define GrGLConfig_DEFINED #include "GrTypes.h" /** * Optional GL config file. */ #ifdef GR_GL_CUSTOM_SETUP_HEADER #include GR_GL_CUSTOM_SETUP_HEADER #endif #if !defined(GR_GL_FUNCTION_TYPE) #define GR_GL_FUNCTION_TYPE #endif /** * The following are optional defines that can be enabled at the compiler * command line, in a IDE project, in a GrUserConfig.h file, or in a GL custom * file (if one is in use). If a GR_GL_CUSTOM_SETUP_HEADER is used they can * also be placed there. * * GR_GL_LOG_CALLS: if 1 Gr can print every GL call using GrPrintf. Defaults to * 0. Logging can be enabled and disabled at runtime using a debugger via to * global gLogCallsGL. The initial value of gLogCallsGL is controlled by * GR_GL_LOG_CALLS_START. * * GR_GL_LOG_CALLS_START: controls the initial value of gLogCallsGL when * GR_GL_LOG_CALLS is 1. Defaults to 0. * * GR_GL_CHECK_ERROR: if enabled Gr can do a glGetError() after every GL call. * Defaults to 1 if SK_DEBUG is set, otherwise 0. When GR_GL_CHECK_ERROR is 1 * this can be toggled in a debugger using the gCheckErrorGL global. The initial * value of gCheckErrorGL is controlled by by GR_GL_CHECK_ERROR_START. * * GR_GL_CHECK_ERROR_START: controls the initial value of gCheckErrorGL * when GR_GL_CHECK_ERROR is 1. Defaults to 1. * * GR_GL_NO_CONSTANT_ATTRIBUTES: if this evaluates to true then the GL backend * will use uniforms instead of attributes in all cases when there is not * per-vertex data. This is important when the underlying GL implementation * doesn't actually support immediate style attribute values (e.g. when * the GL stream is converted to DX as in ANGLE on Chrome). Defaults to 0. * * GR_GL_USE_BUFFER_DATA_NULL_HINT: When specifing new data for a vertex/index * buffer that replaces old data Ganesh can give a hint to the driver that the * previous data will not be used in future draws like this: * glBufferData(GL_..._BUFFER, size, NULL, usage); //<--hint, NULL means * glBufferSubData(GL_..._BUFFER, 0, lessThanSize, data) // old data can't be * // used again. * However, this can be an unoptimization on some platforms, esp. Chrome. * Chrome's cmd buffer will create a new allocation and memset the whole thing * to zero (for security reasons). Defaults to 1 (enabled). * * GR_GL_PER_GL_FUNC_CALLBACK: When set to 1 the GrGLInterface object provides * a function pointer that is called just before every gl function. The ptr must * be valid (i.e. there is no NULL check). However, by default the callback will * be set to a function that does nothing. The signature of the function is: * void function(const GrGLInterface*) * It is not extern "C". * The GrGLInterface field fCallback specifies the function ptr and there is an * additional field fCallbackData of type intptr_t for client data. * * GR_GL_RGBA_8888_PIXEL_OPS_SLOW: Set this to 1 if it is known that performing * glReadPixels / glTex(Sub)Image with format=GL_RGBA, type=GL_UNISIGNED_BYTE is * significantly slower than format=GL_BGRA, type=GL_UNISIGNED_BYTE. * * GR_GL_FULL_READPIXELS_FASTER_THAN_PARTIAL: Set this to 1 if calling * glReadPixels to read the entire framebuffer is faster than calling it with * the same sized rectangle but with a framebuffer bound that is larger than * the rectangle read. * * GR_GL_CHECK_ALLOC_WITH_GET_ERROR: If set to 1 this will then glTexImage, * glBufferData, glRenderbufferStorage, etc will be checked for errors. This * amounts to ensuring the error is GL_NO_ERROR, calling the allocating * function, and then checking that the error is still GL_NO_ERROR. When the * value is 0 we will assume no error was generated without checking. * * GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT: We will normally check the FBO status * every time we bind a texture or renderbuffer to an FBO. However, in some * environments CheckFrameBufferStatus is very expensive. If this is set we will * check the first time we use a color format or a combination of color / * stencil formats as attachments. If the FBO is complete we will assume * subsequent attachments with the same formats are complete as well. * * GR_GL_USE_NV_PATH_RENDERING: Enable experimental support for * GL_NV_path_rendering. There are known issues with clipping, non-AA paths, and * perspective. * * GR_GL_MUST_USE_VBO: Indicates that all vertices and indices must be rendered * from VBOs. Chromium's command buffer doesn't allow glVertexAttribArray with * ARARY_BUFFER 0 bound or glDrawElements with ELEMENT_ARRAY_BUFFER 0 bound. * * GR_GL_USE_NEW_SHADER_SOURCE_SIGNATURE is for compatibility with the new version * of the OpenGLES2.0 headers from Khronos. glShaderSource now takes a const char * const *, * instead of a const char */ #if !defined(GR_GL_LOG_CALLS) #ifdef SK_DEBUG #define GR_GL_LOG_CALLS 1 #else #define GR_GL_LOG_CALLS 0 #endif #endif #if !defined(GR_GL_LOG_CALLS_START) #define GR_GL_LOG_CALLS_START 0 #endif #if !defined(GR_GL_CHECK_ERROR) #ifdef SK_DEBUG #define GR_GL_CHECK_ERROR 1 #else #define GR_GL_CHECK_ERROR 0 #endif #endif #if !defined(GR_GL_CHECK_ERROR_START) #define GR_GL_CHECK_ERROR_START 1 #endif #if !defined(GR_GL_NO_CONSTANT_ATTRIBUTES) #define GR_GL_NO_CONSTANT_ATTRIBUTES 0 #endif #if !defined(GR_GL_USE_BUFFER_DATA_NULL_HINT) #define GR_GL_USE_BUFFER_DATA_NULL_HINT 1 #endif #if !defined(GR_GL_PER_GL_FUNC_CALLBACK) #define GR_GL_PER_GL_FUNC_CALLBACK 0 #endif #if !defined(GR_GL_RGBA_8888_PIXEL_OPS_SLOW) #define GR_GL_RGBA_8888_PIXEL_OPS_SLOW 0 #endif #if !defined(GR_GL_FULL_READPIXELS_FASTER_THAN_PARTIAL) #define GR_GL_FULL_READPIXELS_FASTER_THAN_PARTIAL 0 #endif #if !defined(GR_GL_CHECK_ALLOC_WITH_GET_ERROR) #define GR_GL_CHECK_ALLOC_WITH_GET_ERROR 1 #endif #if !defined(GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT) #define GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT 0 #endif #if !defined(GR_GL_USE_NV_PATH_RENDERING) #define GR_GL_USE_NV_PATH_RENDERING 0 #endif #if !defined(GR_GL_MUST_USE_VBO) #define GR_GL_MUST_USE_VBO 0 #endif #if !defined(GR_GL_USE_NEW_SHADER_SOURCE_SIGNATURE) #define GR_GL_USE_NEW_SHADER_SOURCE_SIGNATURE 0 #endif // We now have a separate GrGLInterface function pointer entry for the IMG/EXT version of // glRenderbufferStorageMultisampled. However, Chrome is setting the one we now use for // ES3 MSAA to point to the IMG/EXT function. This macro exists to make Skia ignore the // ES3 MSAA and instead use the IMG/EXT version with the old function pointer entry. It will // be removed as soon as Chrome is updated to set the new function pointer. #if !defined(GR_GL_IGNORE_ES3_MSAA) #define GR_GL_IGNORE_ES3_MSAA 0 #endif /** * There is a strange bug that occurs on Macs with NVIDIA GPUs. We don't * fully understand it. When (element) array buffers are continually * respecified using glBufferData performance can fall off of a cliff. The * driver winds up performing many DMA mapping / unmappings and chews up ~50% of * the core. However, it has been observed that occaisonally respecifiying the * buffer using glBufferData and then writing data using glBufferSubData * prevents the bad behavior. * * There is a lot of uncertainty around this issue. In Chrome backgrounding * the tab somehow initiates this behavior and we don't know what the connection * is. Another observation is that Chrome's cmd buffer server will actually * create a buffer full of zeros when it sees a NULL data param (for security * reasons). If this is disabled and NULL is actually passed all the way to the * driver then the workaround doesn't help. * * The issue is tracked at: * http://code.google.com/p/chromium/issues/detail?id=114865 * * When the workaround is enabled we will use the glBufferData / glBufferSubData * trick every 128 array buffer uploads. * * Hopefully we will understand this better and have a cleaner fix or get a * OS/driver level fix. */ #define GR_GL_MAC_BUFFER_OBJECT_PERFOMANCE_WORKAROUND \ (defined(SK_BUILD_FOR_MAC) && \ !GR_GL_USE_BUFFER_DATA_NULL_HINT) #endif