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/*
* 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/mesa/SkMesaGLContext.h"
#include "gl/GrGLDefines.h"
static const GrGLint gBOGUS_SIZE = 16;
SkMesaGLContext::SkMesaGLContext()
: fContext(static_cast<Context>(0))
, fImage(nullptr) {
GR_STATIC_ASSERT(sizeof(Context) == sizeof(OSMesaContext));
/* 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, nullptr);
#else
fContext = (Context)OSMesaCreateContext(OSMESA_BGRA, nullptr);
#endif
if (!fContext) {
SkDebugf("OSMesaCreateContext failed!\n");
this->destroyGLContext();
return;
}
// 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;
}
// 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;
}
SkAutoTUnref<const GrGLInterface> gl(GrGLCreateMesaInterface());
if (nullptr == gl.get()) {
SkDebugf("Could not create GL interface!\n");
this->destroyGLContext();
return;
}
if (!gl->validate()) {
SkDebugf("Could not validate GL interface!\n");
this->destroyGLContext();
return;
}
this->init(gl.release());
}
SkMesaGLContext::~SkMesaGLContext() {
this->teardown();
this->destroyGLContext();
}
void SkMesaGLContext::destroyGLContext() {
if (fImage) {
sk_free(fImage);
fImage = nullptr;
}
if (fContext) {
OSMesaDestroyContext((OSMesaContext)fContext);
fContext = static_cast<Context>(0);
}
}
void SkMesaGLContext::onPlatformMakeCurrent() const {
if (fContext) {
if (!OSMesaMakeCurrent((OSMesaContext)fContext, fImage,
GR_GL_UNSIGNED_BYTE, gBOGUS_SIZE, gBOGUS_SIZE)) {
SkDebugf("Could not make MESA context current.");
}
}
}
void SkMesaGLContext::onPlatformSwapBuffers() const { }
GrGLFuncPtr SkMesaGLContext::onPlatformGetProcAddress(const char* procName) const {
return OSMesaGetProcAddress(procName);
}
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