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comparison: gfx/skia/trunk/include/utils/SkWGL.h
gfx/skia/trunk/include/utils/SkWGL.h
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- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:36af62263caa |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2011 Google Inc. | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 | |
| 9 #include "SkRefCnt.h" | |
| 10 | |
| 11 #ifndef SkWGL_DEFINED | |
| 12 #define SkWGL_DEFINED | |
| 13 | |
| 14 /** | |
| 15 * Working with WGL extensions can be a pain. Among the reasons is that You must | |
| 16 * have a GL context to get the proc addresses, but you want to use the procs to | |
| 17 * create a context in the first place. So you have to create a dummy GL ctx to | |
| 18 * get the proc addresses. | |
| 19 * | |
| 20 * This file helps by providing SkCreateWGLInterface(). It returns a struct of | |
| 21 * function pointers that it initializes. It also has a helper function to query | |
| 22 * for WGL extensions. It handles the fact that wglGetExtensionsString is itself | |
| 23 * an extension. | |
| 24 */ | |
| 25 | |
| 26 #if !defined(WIN32_LEAN_AND_MEAN) | |
| 27 #define WIN32_LEAN_AND_MEAN | |
| 28 #define SK_LOCAL_LEAN_AND_MEAN | |
| 29 #endif | |
| 30 #include <windows.h> | |
| 31 #if defined(SK_LOCAL_LEAN_AND_MEAN) | |
| 32 #undef WIN32_LEAN_AND_MEAN | |
| 33 #undef SK_LOCAL_LEAN_AND_MEAN | |
| 34 #endif | |
| 35 | |
| 36 #define SK_WGL_DRAW_TO_WINDOW 0x2001 | |
| 37 #define SK_WGL_ACCELERATION 0x2003 | |
| 38 #define SK_WGL_SUPPORT_OPENGL 0x2010 | |
| 39 #define SK_WGL_DOUBLE_BUFFER 0x2011 | |
| 40 #define SK_WGL_COLOR_BITS 0x2014 | |
| 41 #define SK_WGL_ALPHA_BITS 0x201B | |
| 42 #define SK_WGL_STENCIL_BITS 0x2023 | |
| 43 #define SK_WGL_FULL_ACCELERATION 0x2027 | |
| 44 #define SK_WGL_SAMPLE_BUFFERS 0x2041 | |
| 45 #define SK_WGL_SAMPLES 0x2042 | |
| 46 #define SK_WGL_CONTEXT_MAJOR_VERSION 0x2091 | |
| 47 #define SK_WGL_CONTEXT_MINOR_VERSION 0x2092 | |
| 48 #define SK_WGL_CONTEXT_LAYER_PLANE 0x2093 | |
| 49 #define SK_WGL_CONTEXT_FLAGS 0x2094 | |
| 50 #define SK_WGL_CONTEXT_PROFILE_MASK 0x9126 | |
| 51 #define SK_WGL_CONTEXT_DEBUG_BIT 0x0001 | |
| 52 #define SK_WGL_CONTEXT_FORWARD_COMPATIBLE_BIT 0x0002 | |
| 53 #define SK_WGL_CONTEXT_CORE_PROFILE_BIT 0x00000001 | |
| 54 #define SK_WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT 0x00000002 | |
| 55 #define SK_WGL_CONTEXT_ES2_PROFILE_BIT 0x00000004 | |
| 56 #define SK_ERROR_INVALID_VERSION 0x2095 | |
| 57 #define SK_ERROR_INVALID_PROFILE 0x2096 | |
| 58 | |
| 59 class SkWGLExtensions { | |
| 60 public: | |
| 61 SkWGLExtensions(); | |
| 62 /** | |
| 63 * Determines if an extensions is available for a given DC. | |
| 64 * WGL_extensions_string is considered a prerequisite for all other | |
| 65 * extensions. It is necessary to check this before calling other class | |
| 66 * functions. | |
| 67 */ | |
| 68 bool hasExtension(HDC dc, const char* ext) const; | |
| 69 | |
| 70 const char* getExtensionsString(HDC hdc) const; | |
| 71 BOOL choosePixelFormat(HDC hdc, const int*, const FLOAT*, UINT, int*, UINT*) const; | |
| 72 BOOL getPixelFormatAttribiv(HDC, int, int, UINT, const int*, int*) const; | |
| 73 BOOL getPixelFormatAttribfv(HDC hdc, int, int, UINT, const int*, FLOAT*) const; | |
| 74 HGLRC createContextAttribs(HDC, HGLRC, const int *) const; | |
| 75 | |
| 76 /** | |
| 77 * WGL doesn't have precise rules for the ordering of formats returned | |
| 78 * by wglChoosePixelFormat. This function helps choose among the set of | |
| 79 * formats returned by wglChoosePixelFormat. The rules in decreasing | |
| 80 * priority are: | |
| 81 * * Choose formats with the smallest sample count that is >= | |
| 82 * desiredSampleCount (or the largest sample count if all formats have | |
| 83 * fewer samples than desiredSampleCount.) | |
| 84 * * Choose formats with the fewest color samples when coverage sampling | |
| 85 * is available. | |
| 86 * * If the above rules leave multiple formats, choose the one that | |
| 87 * appears first in the formats array parameter. | |
| 88 */ | |
| 89 int selectFormat(const int formats[], | |
| 90 int formatCount, | |
| 91 HDC dc, | |
| 92 int desiredSampleCount); | |
| 93 private: | |
| 94 typedef const char* (WINAPI *GetExtensionsStringProc)(HDC hdc); | |
| 95 typedef BOOL (WINAPI *ChoosePixelFormatProc)(HDC hdc, const int *, const FLOAT *, UINT, int *, UINT *); | |
| 96 typedef BOOL (WINAPI *GetPixelFormatAttribivProc)(HDC, int, int, UINT, const int*, int*); | |
| 97 typedef BOOL (WINAPI *GetPixelFormatAttribfvProc)(HDC hdc, int, int, UINT, const int*, FLOAT*); | |
| 98 typedef HGLRC (WINAPI *CreateContextAttribsProc)(HDC hDC, HGLRC, const int *); | |
| 99 | |
| 100 GetExtensionsStringProc fGetExtensionsString; | |
| 101 ChoosePixelFormatProc fChoosePixelFormat; | |
| 102 GetPixelFormatAttribfvProc fGetPixelFormatAttribfv; | |
| 103 GetPixelFormatAttribivProc fGetPixelFormatAttribiv; | |
| 104 CreateContextAttribsProc fCreateContextAttribs; | |
| 105 }; | |
| 106 | |
| 107 /** | |
| 108 * Helper to create an OpenGL context for a DC using WGL. Configs with a sample count >= to | |
| 109 * msaaSampleCount are preferred but if none is available then a context with a lower sample count | |
| 110 * (including non-MSAA) will be created. If preferCoreProfile is true but a core profile cannot be | |
| 111 * created then a compatible profile context will be created. | |
| 112 */ | |
| 113 HGLRC SkCreateWGLContext(HDC dc, int msaaSampleCount, bool preferCoreProfile); | |
| 114 | |
| 115 #endif |
