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_COVERAGE_SAMPLES 0x2042 /* same as SAMPLES */ 47 #define SK_WGL_COLOR_SAMPLES 0x20B9 48 #define SK_WGL_CONTEXT_MAJOR_VERSION 0x2091 49 #define SK_WGL_CONTEXT_MINOR_VERSION 0x2092 50 #define SK_WGL_CONTEXT_LAYER_PLANE 0x2093 51 #define SK_WGL_CONTEXT_FLAGS 0x2094 52 #define SK_WGL_CONTEXT_PROFILE_MASK 0x9126 53 #define SK_WGL_CONTEXT_DEBUG_BIT 0x0001 54 #define SK_WGL_CONTEXT_FORWARD_COMPATIBLE_BIT 0x0002 55 #define SK_WGL_CONTEXT_CORE_PROFILE_BIT 0x00000001 56 #define SK_WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT 0x00000002 57 #define SK_WGL_CONTEXT_ES2_PROFILE_BIT 0x00000004 58 #define SK_ERROR_INVALID_VERSION 0x2095 59 #define SK_ERROR_INVALID_PROFILE 0x2096 60 61 class SkWGLExtensions { 62 public: 63 SkWGLExtensions(); 64 /** 65 * Determines if an extensions is available for a given DC. 66 * WGL_extensions_string is considered a prerequisite for all other 67 * extensions. It is necessary to check this before calling other class 68 * functions. 69 */ 70 bool hasExtension(HDC dc, const char* ext) const; 71 72 const char* getExtensionsString(HDC hdc) const; 73 BOOL choosePixelFormat(HDC hdc, const int*, const FLOAT*, UINT, int*, UINT*) const; 74 BOOL getPixelFormatAttribiv(HDC, int, int, UINT, const int*, int*) const; 75 BOOL getPixelFormatAttribfv(HDC hdc, int, int, UINT, const int*, FLOAT*) const; 76 HGLRC createContextAttribs(HDC, HGLRC, const int *) const; 77 78 /** 79 * WGL doesn't have precise rules for the ordering of formats returned 80 * by wglChoosePixelFormat. This function helps choose among the set of 81 * formats returned by wglChoosePixelFormat. The rules in decreasing 82 * priority are: 83 * * Choose formats with the smallest sample count that is >= 84 * desiredSampleCount (or the largest sample count if all formats have 85 * fewer samples than desiredSampleCount.) 86 * * Choose formats with the fewest color samples when coverage sampling 87 * is available. 88 * * If the above rules leave multiple formats, choose the one that 89 * appears first in the formats array parameter. 90 */ 91 int selectFormat(const int formats[], 92 int formatCount, 93 HDC dc, 94 int desiredSampleCount); 95 private: 96 typedef const char* (WINAPI *GetExtensionsStringProc)(HDC hdc); 97 typedef BOOL (WINAPI *ChoosePixelFormatProc)(HDC hdc, const int *, const FLOAT *, UINT, int *, UINT *); 98 typedef BOOL (WINAPI *GetPixelFormatAttribivProc)(HDC, int, int, UINT, const int*, int*); 99 typedef BOOL (WINAPI *GetPixelFormatAttribfvProc)(HDC hdc, int, int, UINT, const int*, FLOAT*); 100 typedef HGLRC (WINAPI *CreateContextAttribsProc)(HDC hDC, HGLRC, const int *); 101 102 GetExtensionsStringProc fGetExtensionsString; 103 ChoosePixelFormatProc fChoosePixelFormat; 104 GetPixelFormatAttribfvProc fGetPixelFormatAttribfv; 105 GetPixelFormatAttribivProc fGetPixelFormatAttribiv; 106 CreateContextAttribsProc fCreateContextAttribs; 107 }; 108 109 #endif 110
