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- /*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/core/SkRefCnt.h"
- #ifndef SkWGL_DEFINED
- #define SkWGL_DEFINED
- #include "src/core/SkLeanWindows.h"
- /**
- * Working with WGL extensions can be a pain. Among the reasons is that You must
- * have a GL context to get the proc addresses, but you want to use the procs to
- * create a context in the first place. So you have to create a dummy GL ctx to
- * get the proc addresses.
- *
- * This file helps by providing SkCreateWGLInterface(). It returns a struct of
- * function pointers that it initializes. It also has a helper function to query
- * for WGL extensions. It handles the fact that wglGetExtensionsString is itself
- * an extension.
- */
- #define SK_WGL_DRAW_TO_WINDOW 0x2001
- #define SK_WGL_ACCELERATION 0x2003
- #define SK_WGL_SUPPORT_OPENGL 0x2010
- #define SK_WGL_DOUBLE_BUFFER 0x2011
- #define SK_WGL_COLOR_BITS 0x2014
- #define SK_WGL_RED_BITS 0x2015
- #define SK_WGL_GREEN_BITS 0x2017
- #define SK_WGL_BLUE_BITS 0x2019
- #define SK_WGL_ALPHA_BITS 0x201B
- #define SK_WGL_STENCIL_BITS 0x2023
- #define SK_WGL_FULL_ACCELERATION 0x2027
- #define SK_WGL_SAMPLE_BUFFERS 0x2041
- #define SK_WGL_SAMPLES 0x2042
- #define SK_WGL_CONTEXT_MAJOR_VERSION 0x2091
- #define SK_WGL_CONTEXT_MINOR_VERSION 0x2092
- #define SK_WGL_CONTEXT_LAYER_PLANE 0x2093
- #define SK_WGL_CONTEXT_FLAGS 0x2094
- #define SK_WGL_CONTEXT_PROFILE_MASK 0x9126
- #define SK_WGL_CONTEXT_DEBUG_BIT 0x0001
- #define SK_WGL_CONTEXT_FORWARD_COMPATIBLE_BIT 0x0002
- #define SK_WGL_CONTEXT_CORE_PROFILE_BIT 0x00000001
- #define SK_WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT 0x00000002
- #define SK_WGL_CONTEXT_ES2_PROFILE_BIT 0x00000004
- #define SK_ERROR_INVALID_VERSION 0x2095
- #define SK_ERROR_INVALID_PROFILE 0x2096
- DECLARE_HANDLE(HPBUFFER);
- class SkWGLExtensions {
- public:
- SkWGLExtensions();
- /**
- * Determines if an extensions is available for a given DC.
- * WGL_extensions_string is considered a prerequisite for all other
- * extensions. It is necessary to check this before calling other class
- * functions.
- */
- bool hasExtension(HDC dc, const char* ext) const;
- const char* getExtensionsString(HDC hdc) const;
- BOOL choosePixelFormat(HDC hdc, const int*, const FLOAT*, UINT, int*, UINT*) const;
- BOOL getPixelFormatAttribiv(HDC, int, int, UINT, const int*, int*) const;
- BOOL getPixelFormatAttribfv(HDC hdc, int, int, UINT, const int*, FLOAT*) const;
- HGLRC createContextAttribs(HDC, HGLRC, const int *) const;
- BOOL swapInterval(int interval) const;
- HPBUFFER createPbuffer(HDC, int , int, int, const int*) const;
- HDC getPbufferDC(HPBUFFER) const;
- int releasePbufferDC(HPBUFFER, HDC) const;
- BOOL destroyPbuffer(HPBUFFER) const;
- /**
- * WGL doesn't have precise rules for the ordering of formats returned
- * by wglChoosePixelFormat. This function helps choose among the set of
- * formats returned by wglChoosePixelFormat. The rules in decreasing
- * priority are:
- * * Choose formats with the smallest sample count that is >=
- * desiredSampleCount (or the largest sample count if all formats have
- * fewer samples than desiredSampleCount.) If desiredSampleCount is 1 then
- * all msaa formats are excluded from consideration.
- * * Choose formats with the fewest color samples when coverage sampling
- * is available.
- * * If the above rules leave multiple formats, choose the one that
- * appears first in the formats array parameter.
- */
- int selectFormat(const int formats[],
- int formatCount,
- HDC dc,
- int desiredSampleCount) const;
- private:
- typedef const char* (WINAPI *GetExtensionsStringProc)(HDC);
- typedef BOOL (WINAPI *ChoosePixelFormatProc)(HDC, const int *, const FLOAT *, UINT, int *, UINT *);
- typedef BOOL (WINAPI *GetPixelFormatAttribivProc)(HDC, int, int, UINT, const int*, int*);
- typedef BOOL (WINAPI *GetPixelFormatAttribfvProc)(HDC, int, int, UINT, const int*, FLOAT*);
- typedef HGLRC (WINAPI *CreateContextAttribsProc)(HDC, HGLRC, const int *);
- typedef BOOL (WINAPI* SwapIntervalProc)(int);
- typedef HPBUFFER (WINAPI* CreatePbufferProc)(HDC, int , int, int, const int*);
- typedef HDC (WINAPI* GetPbufferDCProc)(HPBUFFER);
- typedef int (WINAPI* ReleasePbufferDCProc)(HPBUFFER, HDC);
- typedef BOOL (WINAPI* DestroyPbufferProc)(HPBUFFER);
- static GetExtensionsStringProc fGetExtensionsString;
- static ChoosePixelFormatProc fChoosePixelFormat;
- static GetPixelFormatAttribfvProc fGetPixelFormatAttribfv;
- static GetPixelFormatAttribivProc fGetPixelFormatAttribiv;
- static CreateContextAttribsProc fCreateContextAttribs;
- static SwapIntervalProc fSwapInterval;
- static CreatePbufferProc fCreatePbuffer;
- static GetPbufferDCProc fGetPbufferDC;
- static ReleasePbufferDCProc fReleasePbufferDC;
- static DestroyPbufferProc fDestroyPbuffer;
- };
- enum SkWGLContextRequest {
- /** Requests to create core profile context if possible, otherwise
- compatibility profile. */
- kGLPreferCoreProfile_SkWGLContextRequest,
- /** Requests to create compatibility profile context if possible, otherwise
- core profile. */
- kGLPreferCompatibilityProfile_SkWGLContextRequest,
- /** Requests to create GL ES profile context. */
- kGLES_SkWGLContextRequest
- };
- /**
- * Helper to create an OpenGL context for a DC using WGL. Configs with a sample count >= to
- * msaaSampleCount are preferred but if none is available then a context with a lower sample count
- * (including non-MSAA) will be created. If msaaSampleCount is 1 then this will fail if a non-msaa
- * context cannot be created. If preferCoreProfile is true but a core profile cannot be created
- * then a compatible profile context will be created.
- */
- HGLRC SkCreateWGLContext(HDC dc, int msaaSampleCount, bool deepColor, SkWGLContextRequest context,
- HGLRC shareContext = nullptr);
- /**
- * Helper class for creating a pbuffer context and deleting all the handles when finished. This
- * requires that a device context has been created. However, the pbuffer gets its own device
- * context. The original device context can be released once the pbuffer context is created.
- */
- class SkWGLPbufferContext : public SkRefCnt {
- public:
- static sk_sp<SkWGLPbufferContext> Create(HDC parentDC, SkWGLContextRequest contextType,
- HGLRC shareContext);
- virtual ~SkWGLPbufferContext();
- HDC getDC() const { return fDC; }
- HGLRC getGLRC() const { return fGLRC; }
- private:
- SkWGLPbufferContext(HPBUFFER pbuffer, HDC dc, HGLRC glrc);
- HPBUFFER fPbuffer;
- HDC fDC;
- HGLRC fGLRC;
- SkWGLExtensions fExtensions;
- };
- #endif
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