9245b7ee76
A pbuffer context is less likely to have a blocking SwapBuffers (due to vsync). R=robertphillips@google.com Author: bsalomon@google.com Review URL: https://codereview.chromium.org/336863009
169 lines
6.9 KiB
C++
169 lines
6.9 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkRefCnt.h"
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#ifndef SkWGL_DEFINED
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#define SkWGL_DEFINED
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/**
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* Working with WGL extensions can be a pain. Among the reasons is that You must
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* have a GL context to get the proc addresses, but you want to use the procs to
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* create a context in the first place. So you have to create a dummy GL ctx to
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* get the proc addresses.
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*
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* This file helps by providing SkCreateWGLInterface(). It returns a struct of
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* function pointers that it initializes. It also has a helper function to query
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* for WGL extensions. It handles the fact that wglGetExtensionsString is itself
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* an extension.
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*/
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#if !defined(WIN32_LEAN_AND_MEAN)
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#define WIN32_LEAN_AND_MEAN
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#define SK_LOCAL_LEAN_AND_MEAN
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#endif
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#include <windows.h>
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#if defined(SK_LOCAL_LEAN_AND_MEAN)
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#undef WIN32_LEAN_AND_MEAN
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#undef SK_LOCAL_LEAN_AND_MEAN
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#endif
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#define SK_WGL_DRAW_TO_WINDOW 0x2001
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#define SK_WGL_ACCELERATION 0x2003
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#define SK_WGL_SUPPORT_OPENGL 0x2010
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#define SK_WGL_DOUBLE_BUFFER 0x2011
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#define SK_WGL_COLOR_BITS 0x2014
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#define SK_WGL_ALPHA_BITS 0x201B
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#define SK_WGL_STENCIL_BITS 0x2023
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#define SK_WGL_FULL_ACCELERATION 0x2027
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#define SK_WGL_SAMPLE_BUFFERS 0x2041
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#define SK_WGL_SAMPLES 0x2042
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#define SK_WGL_CONTEXT_MAJOR_VERSION 0x2091
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#define SK_WGL_CONTEXT_MINOR_VERSION 0x2092
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#define SK_WGL_CONTEXT_LAYER_PLANE 0x2093
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#define SK_WGL_CONTEXT_FLAGS 0x2094
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#define SK_WGL_CONTEXT_PROFILE_MASK 0x9126
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#define SK_WGL_CONTEXT_DEBUG_BIT 0x0001
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#define SK_WGL_CONTEXT_FORWARD_COMPATIBLE_BIT 0x0002
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#define SK_WGL_CONTEXT_CORE_PROFILE_BIT 0x00000001
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#define SK_WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT 0x00000002
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#define SK_WGL_CONTEXT_ES2_PROFILE_BIT 0x00000004
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#define SK_ERROR_INVALID_VERSION 0x2095
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#define SK_ERROR_INVALID_PROFILE 0x2096
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DECLARE_HANDLE(HPBUFFER);
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class SkWGLExtensions {
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public:
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SkWGLExtensions();
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/**
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* Determines if an extensions is available for a given DC.
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* WGL_extensions_string is considered a prerequisite for all other
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* extensions. It is necessary to check this before calling other class
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* functions.
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*/
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bool hasExtension(HDC dc, const char* ext) const;
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const char* getExtensionsString(HDC hdc) const;
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BOOL choosePixelFormat(HDC hdc, const int*, const FLOAT*, UINT, int*, UINT*) const;
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BOOL getPixelFormatAttribiv(HDC, int, int, UINT, const int*, int*) const;
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BOOL getPixelFormatAttribfv(HDC hdc, int, int, UINT, const int*, FLOAT*) const;
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HGLRC createContextAttribs(HDC, HGLRC, const int *) const;
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BOOL swapInterval(int interval) const;
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HPBUFFER createPbuffer(HDC, int , int, int, const int*) const;
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HDC getPbufferDC(HPBUFFER) const;
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int releasePbufferDC(HPBUFFER, HDC) const;
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BOOL destroyPbuffer(HPBUFFER) const;
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/**
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* WGL doesn't have precise rules for the ordering of formats returned
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* by wglChoosePixelFormat. This function helps choose among the set of
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* formats returned by wglChoosePixelFormat. The rules in decreasing
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* priority are:
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* * Choose formats with the smallest sample count that is >=
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* desiredSampleCount (or the largest sample count if all formats have
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* fewer samples than desiredSampleCount.)
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* * Choose formats with the fewest color samples when coverage sampling
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* is available.
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* * If the above rules leave multiple formats, choose the one that
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* appears first in the formats array parameter.
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*/
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int selectFormat(const int formats[],
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int formatCount,
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HDC dc,
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int desiredSampleCount) const;
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private:
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typedef const char* (WINAPI *GetExtensionsStringProc)(HDC);
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typedef BOOL (WINAPI *ChoosePixelFormatProc)(HDC, const int *, const FLOAT *, UINT, int *, UINT *);
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typedef BOOL (WINAPI *GetPixelFormatAttribivProc)(HDC, int, int, UINT, const int*, int*);
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typedef BOOL (WINAPI *GetPixelFormatAttribfvProc)(HDC, int, int, UINT, const int*, FLOAT*);
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typedef HGLRC (WINAPI *CreateContextAttribsProc)(HDC, HGLRC, const int *);
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typedef BOOL (WINAPI* SwapIntervalProc)(int);
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typedef HPBUFFER (WINAPI* CreatePbufferProc)(HDC, int , int, int, const int*);
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typedef HDC (WINAPI* GetPbufferDCProc)(HPBUFFER);
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typedef int (WINAPI* ReleasePbufferDCProc)(HPBUFFER, HDC);
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typedef BOOL (WINAPI* DestroyPbufferProc)(HPBUFFER);
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GetExtensionsStringProc fGetExtensionsString;
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ChoosePixelFormatProc fChoosePixelFormat;
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GetPixelFormatAttribfvProc fGetPixelFormatAttribfv;
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GetPixelFormatAttribivProc fGetPixelFormatAttribiv;
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CreateContextAttribsProc fCreateContextAttribs;
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SwapIntervalProc fSwapInterval;
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CreatePbufferProc fCreatePbuffer;
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GetPbufferDCProc fGetPbufferDC;
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ReleasePbufferDCProc fReleasePbufferDC;
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DestroyPbufferProc fDestroyPbuffer;
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};
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enum SkWGLContextRequest {
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/** Requests to create core profile context if possible, otherwise
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compatibility profile. */
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kGLPreferCoreProfile_SkWGLContextRequest,
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/** Requests to create compatibility profile context if possible, otherwise
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core profile. */
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kGLPreferCompatibilityProfile_SkWGLContextRequest,
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/** Requests to create GL ES profile context. */
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kGLES_SkWGLContextRequest
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};
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/**
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* Helper to create an OpenGL context for a DC using WGL. Configs with a sample count >= to
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* msaaSampleCount are preferred but if none is available then a context with a lower sample count
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* (including non-MSAA) will be created. If preferCoreProfile is true but a core profile cannot be
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* created then a compatible profile context will be created.
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*/
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HGLRC SkCreateWGLContext(HDC dc, int msaaSampleCount, SkWGLContextRequest context);
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/**
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* Helper class for creating a pbuffer context and deleting all the handles when finished. This
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* requires that a device context has been created. However, the pbuffer gets its own device
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* context. The original device context can be released once the pbuffer context is created.
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*/
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class SkWGLPbufferContext : public SkRefCnt {
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public:
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static SkWGLPbufferContext* Create(HDC parentDC, int msaaSampleCount,
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SkWGLContextRequest contextType);
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virtual ~SkWGLPbufferContext();
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HDC getDC() const { return fDC; }
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HGLRC getGLRC() const { return fGLRC; }
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private:
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SkWGLPbufferContext(HPBUFFER pbuffer, HDC dc, HGLRC glrc);
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HPBUFFER fPbuffer;
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HDC fDC;
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HGLRC fGLRC;
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SkWGLExtensions fExtensions;
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};
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#endif
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