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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/GLContext_mesa.h"
#include "gl/GrGLDefines.h"
#include "gl/GrGLAssembleInterface.h"
#include "gl/GrGLUtil.h"
#include "osmesa_wrapper.h"
namespace {
static GrGLFuncPtr osmesa_get(void* ctx, const char name[]) {
SkASSERT(nullptr == ctx);
SkASSERT(OSMesaGetCurrentContext());
return OSMesaGetProcAddress(name);
}
static const GrGLInterface* create_mesa_interface() {
if (nullptr == OSMesaGetCurrentContext()) {
return nullptr;
}
return GrGLAssembleInterface(nullptr, osmesa_get);
}
static const GrGLint gBOGUS_SIZE = 16;
class MesaGLContext : public sk_gpu_test::GLContext {
private:
typedef intptr_t Context;
public:
MesaGLContext();
~MesaGLContext() override;
private:
void destroyGLContext();
void onPlatformMakeCurrent() const override;
void onPlatformSwapBuffers() const override;
GrGLFuncPtr onPlatformGetProcAddress(const char *) const override;
Context fContext;
GrGLubyte *fImage;
};
MesaGLContext::MesaGLContext() : 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(create_mesa_interface());
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());
}
MesaGLContext::~MesaGLContext() {
this->teardown();
this->destroyGLContext();
}
void MesaGLContext::destroyGLContext() {
if (fImage) {
sk_free(fImage);
fImage = nullptr;
}
if (fContext) {
OSMesaDestroyContext((OSMesaContext) fContext);
fContext = static_cast<Context>(0);
}
}
void MesaGLContext::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 MesaGLContext::onPlatformSwapBuffers() const { }
GrGLFuncPtr MesaGLContext::onPlatformGetProcAddress(const char *procName) const {
return OSMesaGetProcAddress(procName);
}
} // anonymous namespace
namespace sk_gpu_test {
GLContext *CreateMesaGLContext() {
MesaGLContext *ctx = new MesaGLContext;
if (!ctx->isValid()) {
delete ctx;
return nullptr;
}
return ctx;
}
} // sk_gpu_test
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