| /* |
| * 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/base/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 placeholder 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); |
| |
| ~SkWGLPbufferContext() override; |
| |
| 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 |