1
2 /*
3 * Copyright 2015 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 "GrContext.h"
10 #include "SkSurface.h"
11 #include "GLWindowContext.h"
12
13 #include "gl/GrGLDefines.h"
14
15 #include "gl/GrGLUtil.h"
16 #include "GrRenderTarget.h"
17 #include "GrContext.h"
18
19 #include "SkCanvas.h"
20 #include "SkImage_Base.h"
21 #include "SkMathPriv.h"
22
23 namespace sk_app {
24
GLWindowContext(const DisplayParams & params)25 GLWindowContext::GLWindowContext(const DisplayParams& params)
26 : WindowContext()
27 , fBackendContext(nullptr)
28 , fSurface(nullptr) {
29 fDisplayParams = params;
30 fDisplayParams.fMSAASampleCount = fDisplayParams.fMSAASampleCount ?
31 GrNextPow2(fDisplayParams.fMSAASampleCount) :
32 0;
33 }
34
initializeContext()35 void GLWindowContext::initializeContext() {
36 this->onInitializeContext();
37 SkASSERT(nullptr == fContext);
38
39 fBackendContext.reset(GrGLCreateNativeInterface());
40 fContext = GrContext::Create(kOpenGL_GrBackend, (GrBackendContext)fBackendContext.get(),
41 fDisplayParams.fGrContextOptions);
42 if (!fContext && fDisplayParams.fMSAASampleCount) {
43 fDisplayParams.fMSAASampleCount /= 2;
44 this->initializeContext();
45 return;
46 }
47
48 if (fContext) {
49 // We may not have real sRGB support (ANGLE, in particular), so check for
50 // that, and fall back to L32:
51 fPixelConfig = fContext->caps()->srgbSupport() && fDisplayParams.fColorSpace
52 ? kSRGBA_8888_GrPixelConfig : kRGBA_8888_GrPixelConfig;
53 } else {
54 fPixelConfig = kUnknown_GrPixelConfig;
55 }
56 }
57
destroyContext()58 void GLWindowContext::destroyContext() {
59 fSurface.reset(nullptr);
60
61 if (fContext) {
62 // in case we have outstanding refs to this guy (lua?)
63 fContext->abandonContext();
64 fContext->unref();
65 fContext = nullptr;
66 }
67
68 fBackendContext.reset(nullptr);
69
70 this->onDestroyContext();
71 }
72
getBackbufferSurface()73 sk_sp<SkSurface> GLWindowContext::getBackbufferSurface() {
74 if (nullptr == fSurface) {
75 if (fContext) {
76 GrBackendRenderTargetDesc desc;
77 desc.fWidth = this->fWidth;
78 desc.fHeight = this->fHeight;
79 desc.fConfig = fPixelConfig;
80 desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
81 desc.fSampleCnt = fSampleCount;
82 desc.fStencilBits = fStencilBits;
83 GrGLint buffer;
84 GR_GL_CALL(fBackendContext.get(), GetIntegerv(GR_GL_FRAMEBUFFER_BINDING, &buffer));
85 desc.fRenderTargetHandle = buffer;
86
87 fSurface = SkSurface::MakeFromBackendRenderTarget(fContext, desc,
88 fDisplayParams.fColorSpace,
89 &fSurfaceProps);
90 }
91 }
92
93 return fSurface;
94 }
95
swapBuffers()96 void GLWindowContext::swapBuffers() {
97 this->onSwapBuffers();
98 }
99
resize(int w,int h)100 void GLWindowContext::resize(int w, int h) {
101 this->destroyContext();
102 this->initializeContext();
103 }
104
setDisplayParams(const DisplayParams & params)105 void GLWindowContext::setDisplayParams(const DisplayParams& params) {
106 this->destroyContext();
107 fDisplayParams = params;
108 this->initializeContext();
109 }
110
111 } //namespace sk_app
112