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
9 #include <GL/osmesa.h>
10
11 #include "gl/mesa/SkMesaGLContext.h"
12 #include "gl/GrGLDefines.h"
13
14 static const GrGLint gBOGUS_SIZE = 16;
15
SkMesaGLContext()16 SkMesaGLContext::SkMesaGLContext()
17 : fContext(static_cast<Context>(0))
18 , fImage(nullptr) {
19 GR_STATIC_ASSERT(sizeof(Context) == sizeof(OSMesaContext));
20
21 /* Create an RGBA-mode context */
22 #if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
23 /* specify Z, stencil, accum sizes */
24 fContext = (Context)OSMesaCreateContextExt(OSMESA_BGRA, 0, 0, 0, nullptr);
25 #else
26 fContext = (Context)OSMesaCreateContext(OSMESA_BGRA, nullptr);
27 #endif
28 if (!fContext) {
29 SkDebugf("OSMesaCreateContext failed!\n");
30 this->destroyGLContext();
31 return;
32 }
33 // Allocate the image buffer
34 fImage = (GrGLubyte *) sk_malloc_throw(gBOGUS_SIZE * gBOGUS_SIZE *
35 4 * sizeof(GrGLubyte));
36 if (!fImage) {
37 SkDebugf("Alloc image buffer failed!\n");
38 this->destroyGLContext();
39 return;
40 }
41
42 // Bind the buffer to the context and make it current
43 if (!OSMesaMakeCurrent((OSMesaContext)fContext,
44 fImage,
45 GR_GL_UNSIGNED_BYTE,
46 gBOGUS_SIZE,
47 gBOGUS_SIZE)) {
48 SkDebugf("OSMesaMakeCurrent failed!\n");
49 this->destroyGLContext();
50 return;
51 }
52
53 SkAutoTUnref<const GrGLInterface> gl(GrGLCreateMesaInterface());
54 if (nullptr == gl.get()) {
55 SkDebugf("Could not create GL interface!\n");
56 this->destroyGLContext();
57 return;
58 }
59
60 if (!gl->validate()) {
61 SkDebugf("Could not validate GL interface!\n");
62 this->destroyGLContext();
63 return;
64 }
65
66 this->init(gl.detach());
67 }
68
~SkMesaGLContext()69 SkMesaGLContext::~SkMesaGLContext() {
70 this->teardown();
71 this->destroyGLContext();
72 }
73
destroyGLContext()74 void SkMesaGLContext::destroyGLContext() {
75 if (fImage) {
76 sk_free(fImage);
77 fImage = nullptr;
78 }
79
80 if (fContext) {
81 OSMesaDestroyContext((OSMesaContext)fContext);
82 fContext = static_cast<Context>(0);
83 }
84 }
85
86
87
onPlatformMakeCurrent() const88 void SkMesaGLContext::onPlatformMakeCurrent() const {
89 if (fContext) {
90 if (!OSMesaMakeCurrent((OSMesaContext)fContext, fImage,
91 GR_GL_UNSIGNED_BYTE, gBOGUS_SIZE, gBOGUS_SIZE)) {
92 SkDebugf("Could not make MESA context current.");
93 }
94 }
95 }
96
onPlatformSwapBuffers() const97 void SkMesaGLContext::onPlatformSwapBuffers() const { }
98
onPlatformGetProcAddress(const char * procName) const99 GrGLFuncPtr SkMesaGLContext::onPlatformGetProcAddress(const char* procName) const {
100 return OSMesaGetProcAddress(procName);
101 }
102