The Tor Browser: comparison gfx/skia/trunk/include/gpu/gl/GrGLConfig.h

--1:000000000000
+:8756f29cbc9a
+/*
+* 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_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_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
+/**
+* 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

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comparison: gfx/skia/trunk/include/gpu/gl/GrGLConfig.h

gfx/skia/trunk/include/gpu/gl/GrGLConfig.h