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/SkMesaGLContext.h"
12 #include "gl/GrGLDefines.h"
13
AutoContextRestore()14 SkMesaGLContext::AutoContextRestore::AutoContextRestore() {
15 fOldContext = (Context)OSMesaGetCurrentContext();
16 if (NULL != (OSMesaContext)fOldContext) {
17 OSMesaGetColorBuffer((OSMesaContext)fOldContext,
18 &fOldWidth, &fOldHeight,
19 &fOldFormat, &fOldImage);
20 }
21 }
22
~AutoContextRestore()23 SkMesaGLContext::AutoContextRestore::~AutoContextRestore() {
24 if (NULL != (OSMesaContext)fOldContext) {
25 OSMesaMakeCurrent((OSMesaContext)fOldContext, fOldImage,
26 fOldFormat, fOldWidth, fOldHeight);
27 }
28 }
29
30 ///////////////////////////////////////////////////////////////////////////////
31
SkMesaGLContext()32 SkMesaGLContext::SkMesaGLContext()
33 : fContext(static_cast<Context>(NULL))
34 , fImage(NULL) {
35 GR_STATIC_ASSERT(sizeof(Context) == sizeof(OSMesaContext));
36 }
37
~SkMesaGLContext()38 SkMesaGLContext::~SkMesaGLContext() {
39 this->destroyGLContext();
40 }
41
destroyGLContext()42 void SkMesaGLContext::destroyGLContext() {
43 if (fImage) {
44 sk_free(fImage);
45 }
46
47 if (fContext) {
48 OSMesaDestroyContext((OSMesaContext)fContext);
49 }
50 }
51
52 static const GrGLint gBOGUS_SIZE = 16;
53
createGLContext()54 const GrGLInterface* SkMesaGLContext::createGLContext() {
55 /* Create an RGBA-mode context */
56 #if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
57 /* specify Z, stencil, accum sizes */
58 fContext = (Context)OSMesaCreateContextExt(OSMESA_BGRA, 0, 0, 0, NULL);
59 #else
60 fContext = (Context)OSMesaCreateContext(OSMESA_BGRA, NULL);
61 #endif
62 if (!fContext) {
63 SkDebugf("OSMesaCreateContext failed!\n");
64 this->destroyGLContext();
65 return NULL;
66 }
67 // Allocate the image buffer
68 fImage = (GrGLubyte *) sk_malloc_throw(gBOGUS_SIZE * gBOGUS_SIZE *
69 4 * sizeof(GrGLubyte));
70 if (!fImage) {
71 SkDebugf("Alloc image buffer failed!\n");
72 this->destroyGLContext();
73 return NULL;
74 }
75
76 // Bind the buffer to the context and make it current
77 if (!OSMesaMakeCurrent((OSMesaContext)fContext,
78 fImage,
79 GR_GL_UNSIGNED_BYTE,
80 gBOGUS_SIZE,
81 gBOGUS_SIZE)) {
82 SkDebugf("OSMesaMakeCurrent failed!\n");
83 this->destroyGLContext();
84 return NULL;
85 }
86
87 const GrGLInterface* interface = GrGLCreateMesaInterface();
88 if (!interface) {
89 SkDebugf("Could not create GL interface!\n");
90 this->destroyGLContext();
91 return NULL;
92 }
93 return interface;
94
95 }
96
makeCurrent() const97 void SkMesaGLContext::makeCurrent() const {
98 if (fContext) {
99 if (!OSMesaMakeCurrent((OSMesaContext)fContext, fImage,
100 GR_GL_UNSIGNED_BYTE, gBOGUS_SIZE, gBOGUS_SIZE)) {
101 SkDebugf("Could not make MESA context current.");
102 }
103 }
104 }
105