1
2 /*
3 * Copyright 2016 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 "../GLWindowContext.h"
10 #include "WindowContextFactory_unix.h"
11
12 #include <GL/gl.h>
13
14 using sk_app::window_context_factory::XlibWindowInfo;
15 using sk_app::DisplayParams;
16 using sk_app::GLWindowContext;
17
18 namespace {
19
20 class GLWindowContext_xlib : public GLWindowContext {
21 public:
22 GLWindowContext_xlib(const XlibWindowInfo&, const DisplayParams&);
23 ~GLWindowContext_xlib() override;
24
25 void onSwapBuffers() override;
26
27 void onDestroyContext() override;
28
29 protected:
30 void onInitializeContext() override;
31
32 private:
33 GLWindowContext_xlib(void*, const DisplayParams&);
34
35 Display* fDisplay;
36 XWindow fWindow;
37 GLXFBConfig* fFBConfig;
38 XVisualInfo* fVisualInfo;
39 GLXContext fGLContext;
40 };
41
GLWindowContext_xlib(const XlibWindowInfo & winInfo,const DisplayParams & params)42 GLWindowContext_xlib::GLWindowContext_xlib(const XlibWindowInfo& winInfo, const DisplayParams& params)
43 : GLWindowContext(params)
44 , fDisplay(winInfo.fDisplay)
45 , fWindow(winInfo.fWindow)
46 , fFBConfig(winInfo.fFBConfig)
47 , fVisualInfo(winInfo.fVisualInfo)
48 , fGLContext() {
49 fWidth = winInfo.fWidth;
50 fHeight = winInfo.fHeight;
51 this->initializeContext();
52 }
53
54 using CreateContextAttribsFn = GLXContext(Display*, GLXFBConfig, GLXContext, Bool, const int*);
55
onInitializeContext()56 void GLWindowContext_xlib::onInitializeContext() {
57 SkASSERT(fDisplay);
58 SkASSERT(!fGLContext);
59 // We attempt to use glXCreateContextAttribsARB as RenderDoc requires that the context be
60 // created with this rather than glXCreateContext.
61 CreateContextAttribsFn* createContextAttribs = (CreateContextAttribsFn*)glXGetProcAddressARB(
62 (const GLubyte*)"glXCreateContextAttribsARB");
63 if (createContextAttribs && fFBConfig) {
64 // Specifying 3.2 allows an arbitrarily high context version (so long as no 3.2 features
65 // have been removed).
66 for (int minor = 2; minor >= 0 && !fGLContext; --minor) {
67 // Ganesh prefers a compatibility profile for possible NVPR support. However, RenderDoc
68 // requires a core profile. Edit this code to use RenderDoc.
69 for (int profile : {GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
70 GLX_CONTEXT_CORE_PROFILE_BIT_ARB}) {
71 int attribs[] = {
72 GLX_CONTEXT_MAJOR_VERSION_ARB, 3, GLX_CONTEXT_MINOR_VERSION_ARB, minor,
73 GLX_CONTEXT_PROFILE_MASK_ARB, profile,
74 0
75 };
76 fGLContext = createContextAttribs(fDisplay, *fFBConfig, nullptr, True, attribs);
77 if (fGLContext) {
78 break;
79 }
80 }
81 }
82 }
83 if (!fGLContext) {
84 fGLContext = glXCreateContext(fDisplay, fVisualInfo, nullptr, GL_TRUE);
85 }
86 if (!fGLContext) {
87 return;
88 }
89
90 if (glXMakeCurrent(fDisplay, fWindow, fGLContext)) {
91 glClearStencil(0);
92 glClearColor(0, 0, 0, 0);
93 glStencilMask(0xffffffff);
94 glClear(GL_STENCIL_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
95
96 glXGetConfig(fDisplay, fVisualInfo, GLX_STENCIL_SIZE, &fStencilBits);
97 glXGetConfig(fDisplay, fVisualInfo, GLX_SAMPLES_ARB, &fSampleCount);
98
99 XWindow root;
100 int x, y;
101 unsigned int border_width, depth;
102 XGetGeometry(fDisplay, fWindow, &root, &x, &y,
103 (unsigned int*)&fWidth, (unsigned int*)&fHeight, &border_width, &depth);
104 glViewport(0, 0, fWidth, fHeight);
105 }
106 }
107
~GLWindowContext_xlib()108 GLWindowContext_xlib::~GLWindowContext_xlib() {
109 this->destroyContext();
110 }
111
onDestroyContext()112 void GLWindowContext_xlib::onDestroyContext() {
113 if (!fDisplay || !fGLContext) {
114 return;
115 }
116 glXMakeCurrent(fDisplay, None, nullptr);
117 glXDestroyContext(fDisplay, fGLContext);
118 fGLContext = nullptr;
119 }
120
onSwapBuffers()121 void GLWindowContext_xlib::onSwapBuffers() {
122 if (fDisplay && fGLContext) {
123 glXSwapBuffers(fDisplay, fWindow);
124 }
125 }
126
127 } // anonymous namespace
128
129 namespace sk_app {
130
131 namespace window_context_factory {
132
NewGLForXlib(const XlibWindowInfo & winInfo,const DisplayParams & params)133 WindowContext* NewGLForXlib(const XlibWindowInfo& winInfo, const DisplayParams& params) {
134 WindowContext* ctx = new GLWindowContext_xlib(winInfo, params);
135 if (!ctx->isValid()) {
136 delete ctx;
137 return nullptr;
138 }
139 return ctx;
140 }
141
142 } // namespace window_context_factory
143
144 } // namespace sk_app
145