1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/utils/SkWGL.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,115 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2011 Google Inc.
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +#include "SkRefCnt.h"
1.13 +
1.14 +#ifndef SkWGL_DEFINED
1.15 +#define SkWGL_DEFINED
1.16 +
1.17 +/**
1.18 + * Working with WGL extensions can be a pain. Among the reasons is that You must
1.19 + * have a GL context to get the proc addresses, but you want to use the procs to
1.20 + * create a context in the first place. So you have to create a dummy GL ctx to
1.21 + * get the proc addresses.
1.22 + *
1.23 + * This file helps by providing SkCreateWGLInterface(). It returns a struct of
1.24 + * function pointers that it initializes. It also has a helper function to query
1.25 + * for WGL extensions. It handles the fact that wglGetExtensionsString is itself
1.26 + * an extension.
1.27 + */
1.28 +
1.29 +#if !defined(WIN32_LEAN_AND_MEAN)
1.30 + #define WIN32_LEAN_AND_MEAN
1.31 + #define SK_LOCAL_LEAN_AND_MEAN
1.32 +#endif
1.33 +#include <windows.h>
1.34 +#if defined(SK_LOCAL_LEAN_AND_MEAN)
1.35 + #undef WIN32_LEAN_AND_MEAN
1.36 + #undef SK_LOCAL_LEAN_AND_MEAN
1.37 +#endif
1.38 +
1.39 +#define SK_WGL_DRAW_TO_WINDOW 0x2001
1.40 +#define SK_WGL_ACCELERATION 0x2003
1.41 +#define SK_WGL_SUPPORT_OPENGL 0x2010
1.42 +#define SK_WGL_DOUBLE_BUFFER 0x2011
1.43 +#define SK_WGL_COLOR_BITS 0x2014
1.44 +#define SK_WGL_ALPHA_BITS 0x201B
1.45 +#define SK_WGL_STENCIL_BITS 0x2023
1.46 +#define SK_WGL_FULL_ACCELERATION 0x2027
1.47 +#define SK_WGL_SAMPLE_BUFFERS 0x2041
1.48 +#define SK_WGL_SAMPLES 0x2042
1.49 +#define SK_WGL_CONTEXT_MAJOR_VERSION 0x2091
1.50 +#define SK_WGL_CONTEXT_MINOR_VERSION 0x2092
1.51 +#define SK_WGL_CONTEXT_LAYER_PLANE 0x2093
1.52 +#define SK_WGL_CONTEXT_FLAGS 0x2094
1.53 +#define SK_WGL_CONTEXT_PROFILE_MASK 0x9126
1.54 +#define SK_WGL_CONTEXT_DEBUG_BIT 0x0001
1.55 +#define SK_WGL_CONTEXT_FORWARD_COMPATIBLE_BIT 0x0002
1.56 +#define SK_WGL_CONTEXT_CORE_PROFILE_BIT 0x00000001
1.57 +#define SK_WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT 0x00000002
1.58 +#define SK_WGL_CONTEXT_ES2_PROFILE_BIT 0x00000004
1.59 +#define SK_ERROR_INVALID_VERSION 0x2095
1.60 +#define SK_ERROR_INVALID_PROFILE 0x2096
1.61 +
1.62 +class SkWGLExtensions {
1.63 +public:
1.64 + SkWGLExtensions();
1.65 + /**
1.66 + * Determines if an extensions is available for a given DC.
1.67 + * WGL_extensions_string is considered a prerequisite for all other
1.68 + * extensions. It is necessary to check this before calling other class
1.69 + * functions.
1.70 + */
1.71 + bool hasExtension(HDC dc, const char* ext) const;
1.72 +
1.73 + const char* getExtensionsString(HDC hdc) const;
1.74 + BOOL choosePixelFormat(HDC hdc, const int*, const FLOAT*, UINT, int*, UINT*) const;
1.75 + BOOL getPixelFormatAttribiv(HDC, int, int, UINT, const int*, int*) const;
1.76 + BOOL getPixelFormatAttribfv(HDC hdc, int, int, UINT, const int*, FLOAT*) const;
1.77 + HGLRC createContextAttribs(HDC, HGLRC, const int *) const;
1.78 +
1.79 + /**
1.80 + * WGL doesn't have precise rules for the ordering of formats returned
1.81 + * by wglChoosePixelFormat. This function helps choose among the set of
1.82 + * formats returned by wglChoosePixelFormat. The rules in decreasing
1.83 + * priority are:
1.84 + * * Choose formats with the smallest sample count that is >=
1.85 + * desiredSampleCount (or the largest sample count if all formats have
1.86 + * fewer samples than desiredSampleCount.)
1.87 + * * Choose formats with the fewest color samples when coverage sampling
1.88 + * is available.
1.89 + * * If the above rules leave multiple formats, choose the one that
1.90 + * appears first in the formats array parameter.
1.91 + */
1.92 + int selectFormat(const int formats[],
1.93 + int formatCount,
1.94 + HDC dc,
1.95 + int desiredSampleCount);
1.96 +private:
1.97 + typedef const char* (WINAPI *GetExtensionsStringProc)(HDC hdc);
1.98 + typedef BOOL (WINAPI *ChoosePixelFormatProc)(HDC hdc, const int *, const FLOAT *, UINT, int *, UINT *);
1.99 + typedef BOOL (WINAPI *GetPixelFormatAttribivProc)(HDC, int, int, UINT, const int*, int*);
1.100 + typedef BOOL (WINAPI *GetPixelFormatAttribfvProc)(HDC hdc, int, int, UINT, const int*, FLOAT*);
1.101 + typedef HGLRC (WINAPI *CreateContextAttribsProc)(HDC hDC, HGLRC, const int *);
1.102 +
1.103 + GetExtensionsStringProc fGetExtensionsString;
1.104 + ChoosePixelFormatProc fChoosePixelFormat;
1.105 + GetPixelFormatAttribfvProc fGetPixelFormatAttribfv;
1.106 + GetPixelFormatAttribivProc fGetPixelFormatAttribiv;
1.107 + CreateContextAttribsProc fCreateContextAttribs;
1.108 +};
1.109 +
1.110 +/**
1.111 + * Helper to create an OpenGL context for a DC using WGL. Configs with a sample count >= to
1.112 + * msaaSampleCount are preferred but if none is available then a context with a lower sample count
1.113 + * (including non-MSAA) will be created. If preferCoreProfile is true but a core profile cannot be
1.114 + * created then a compatible profile context will be created.
1.115 + */
1.116 +HGLRC SkCreateWGLContext(HDC dc, int msaaSampleCount, bool preferCoreProfile);
1.117 +
1.118 +#endif
