blob: c4f84cf8d2292e40af2bd8bfb7edbe86d61eda41 [file] [log] [blame]
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <GL/osmesa.h>
#include "gl/SkMesaGLContext.h"
SkMesaGLContext::AutoContextRestore::AutoContextRestore() {
fOldContext = (Context)OSMesaGetCurrentContext();
if (NULL != (OSMesaContext)fOldContext) {
OSMesaGetColorBuffer((OSMesaContext)fOldContext,
&fOldWidth, &fOldHeight,
&fOldFormat, &fOldImage);
}
}
SkMesaGLContext::AutoContextRestore::~AutoContextRestore() {
if (NULL != (OSMesaContext)fOldContext) {
OSMesaMakeCurrent((OSMesaContext)fOldContext, fOldImage,
fOldFormat, fOldWidth, fOldHeight);
}
}
///////////////////////////////////////////////////////////////////////////////
SkMesaGLContext::SkMesaGLContext()
: fContext(NULL)
, fImage(NULL) {
GR_STATIC_ASSERT(sizeof(Context) == sizeof(OSMesaContext));
}
SkMesaGLContext::~SkMesaGLContext() {
this->destroyGLContext();
}
void SkMesaGLContext::destroyGLContext() {
if (fImage) {
sk_free(fImage);
}
if (fContext) {
OSMesaDestroyContext((OSMesaContext)fContext);
}
}
static const GrGLint gBOGUS_SIZE = 16;
const GrGLInterface* SkMesaGLContext::createGLContext() {
/* Create an RGBA-mode context */
#if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
/* specify Z, stencil, accum sizes */
fContext = (Context)OSMesaCreateContextExt(OSMESA_BGRA, 0, 0, 0, NULL);
#else
fContext = (Context)OSMesaCreateContext(OSMESA_BGRA, NULL);
#endif
if (!fContext) {
SkDebugf("OSMesaCreateContext failed!\n");
this->destroyGLContext();
return NULL;
}
// Allocate the image buffer
fImage = (GrGLubyte *) sk_malloc_throw(gBOGUS_SIZE * gBOGUS_SIZE *
4 * sizeof(GrGLubyte));
if (!fImage) {
SkDebugf("Alloc image buffer failed!\n");
this->destroyGLContext();
return NULL;
}
// Bind the buffer to the context and make it current
if (!OSMesaMakeCurrent((OSMesaContext)fContext,
fImage,
GR_GL_UNSIGNED_BYTE,
gBOGUS_SIZE,
gBOGUS_SIZE)) {
SkDebugf("OSMesaMakeCurrent failed!\n");
this->destroyGLContext();
return NULL;
}
const GrGLInterface* interface = GrGLCreateMesaInterface();
if (!interface) {
SkDebugf("Could not create GL interface!\n");
this->destroyGLContext();
return NULL;
}
return interface;
}
void SkMesaGLContext::makeCurrent() const {
if (fContext) {
if (!OSMesaMakeCurrent((OSMesaContext)fContext, fImage,
GR_GL_UNSIGNED_BYTE, gBOGUS_SIZE, gBOGUS_SIZE)) {
SkDebugf("Could not make MESA context current.");
}
}
}