1
2 /*
3 * Copyright 2011 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 #include "SkTypes.h"
9 #if defined(SK_BUILD_FOR_MAC)
10
11 #include "gl/SkGLContext.h"
12 #include "AvailabilityMacros.h"
13
14 #include <OpenGL/OpenGL.h>
15 #include <dlfcn.h>
16
17 namespace {
18 class MacGLContext : public SkGLContext {
19 public:
20 MacGLContext();
21 ~MacGLContext() override;
22
23 private:
24 void destroyGLContext();
25
26 void onPlatformMakeCurrent() const override;
27 void onPlatformSwapBuffers() const override;
28 GrGLFuncPtr onPlatformGetProcAddress(const char*) const override;
29
30 CGLContextObj fContext;
31 void* fGLLibrary;
32 };
33
MacGLContext()34 MacGLContext::MacGLContext()
35 : fContext(nullptr)
36 , fGLLibrary(RTLD_DEFAULT) {
37 CGLPixelFormatAttribute attributes[] = {
38 #if MAC_OS_X_VERSION_10_7
39 kCGLPFAOpenGLProfile, (CGLPixelFormatAttribute) kCGLOGLPVersion_3_2_Core,
40 #endif
41 kCGLPFADoubleBuffer,
42 (CGLPixelFormatAttribute)0
43 };
44 CGLPixelFormatObj pixFormat;
45 GLint npix;
46
47 CGLChoosePixelFormat(attributes, &pixFormat, &npix);
48
49 if (nullptr == pixFormat) {
50 SkDebugf("CGLChoosePixelFormat failed.");
51 return;
52 }
53
54 CGLCreateContext(pixFormat, nullptr, &fContext);
55 CGLReleasePixelFormat(pixFormat);
56
57 if (nullptr == fContext) {
58 SkDebugf("CGLCreateContext failed.");
59 return;
60 }
61
62 CGLSetCurrentContext(fContext);
63
64 SkAutoTUnref<const GrGLInterface> gl(GrGLCreateNativeInterface());
65 if (nullptr == gl.get()) {
66 SkDebugf("Context could not create GL interface.\n");
67 this->destroyGLContext();
68 return;
69 }
70 if (!gl->validate()) {
71 SkDebugf("Context could not validate GL interface.\n");
72 this->destroyGLContext();
73 return;
74 }
75
76 fGLLibrary = dlopen(
77 "/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib",
78 RTLD_LAZY);
79
80 this->init(gl.detach());
81 }
82
~MacGLContext()83 MacGLContext::~MacGLContext() {
84 this->teardown();
85 this->destroyGLContext();
86 }
87
destroyGLContext()88 void MacGLContext::destroyGLContext() {
89 if (fContext) {
90 CGLReleaseContext(fContext);
91 fContext = nullptr;
92 }
93 if (RTLD_DEFAULT != fGLLibrary) {
94 dlclose(fGLLibrary);
95 }
96 }
97
onPlatformMakeCurrent() const98 void MacGLContext::onPlatformMakeCurrent() const {
99 CGLSetCurrentContext(fContext);
100 }
101
onPlatformSwapBuffers() const102 void MacGLContext::onPlatformSwapBuffers() const {
103 CGLFlushDrawable(fContext);
104 }
105
onPlatformGetProcAddress(const char * procName) const106 GrGLFuncPtr MacGLContext::onPlatformGetProcAddress(const char* procName) const {
107 return reinterpret_cast<GrGLFuncPtr>(dlsym(fGLLibrary, procName));
108 }
109
110 } // anonymous namespace
111
SkCreatePlatformGLContext(GrGLStandard forcedGpuAPI,SkGLContext * shareContext)112 SkGLContext* SkCreatePlatformGLContext(GrGLStandard forcedGpuAPI, SkGLContext* shareContext) {
113 SkASSERT(!shareContext);
114 if (shareContext) {
115 return nullptr;
116 }
117
118 if (kGLES_GrGLStandard == forcedGpuAPI) {
119 return nullptr;
120 }
121 MacGLContext* ctx = new MacGLContext;
122 if (!ctx->isValid()) {
123 delete ctx;
124 return nullptr;
125 }
126 return ctx;
127 }
128
129 #endif//defined(SK_BUILD_FOR_MAC)
130