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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gl/SkGLContext.h"
#include "GrGLUtil.h"
#include "SkGpuFenceSync.h"
class SkGLContext::GLFenceSync : public SkGpuFenceSync {
public:
static GLFenceSync* CreateIfSupported(const SkGLContext*);
SkPlatformGpuFence SK_WARN_UNUSED_RESULT insertFence() const override;
bool flushAndWaitFence(SkPlatformGpuFence fence) const override;
void deleteFence(SkPlatformGpuFence fence) const override;
private:
GLFenceSync() {}
static const GrGLenum GL_SYNC_GPU_COMMANDS_COMPLETE = 0x9117;
static const GrGLenum GL_WAIT_FAILED = 0x911d;
static const GrGLbitfield GL_SYNC_FLUSH_COMMANDS_BIT = 0x00000001;
typedef struct __GLsync *GLsync;
typedef GLsync (GR_GL_FUNCTION_TYPE* GLFenceSyncProc) (GrGLenum, GrGLbitfield);
typedef GrGLenum (GR_GL_FUNCTION_TYPE* GLClientWaitSyncProc) (GLsync, GrGLbitfield, GrGLuint64);
typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GLDeleteSyncProc) (GLsync);
GLFenceSyncProc fGLFenceSync;
GLClientWaitSyncProc fGLClientWaitSync;
GLDeleteSyncProc fGLDeleteSync;
typedef SkGpuFenceSync INHERITED;
};
SkGLContext::SkGLContext()
: fCurrentFenceIdx(0) {
memset(fFrameFences, 0, sizeof(fFrameFences));
}
SkGLContext::~SkGLContext() {
// Subclass should call teardown.
#ifdef SK_DEBUG
for (size_t i = 0; i < SK_ARRAY_COUNT(fFrameFences); i++) {
SkASSERT(0 == fFrameFences[i]);
}
#endif
SkASSERT(NULL == fGL.get());
SkASSERT(NULL == fFenceSync.get());
}
void SkGLContext::init(const GrGLInterface* gl, SkGpuFenceSync* fenceSync) {
SkASSERT(!fGL.get());
fGL.reset(gl);
fFenceSync.reset(fenceSync ? fenceSync : GLFenceSync::CreateIfSupported(this));
}
void SkGLContext::teardown() {
if (fFenceSync) {
for (size_t i = 0; i < SK_ARRAY_COUNT(fFrameFences); i++) {
if (fFrameFences[i]) {
fFenceSync->deleteFence(fFrameFences[i]);
fFrameFences[i] = 0;
}
}
fFenceSync.reset(NULL);
}
fGL.reset(NULL);
}
void SkGLContext::makeCurrent() const {
this->onPlatformMakeCurrent();
}
void SkGLContext::swapBuffers() {
if (!fFenceSync) {
// Fallback on the platform SwapBuffers method for synchronization. This may have no effect.
this->onPlatformSwapBuffers();
return;
}
if (fFrameFences[fCurrentFenceIdx]) {
if (!fFenceSync->flushAndWaitFence(fFrameFences[fCurrentFenceIdx])) {
SkDebugf("WARNING: Wait failed for fence sync. Timings might not be accurate.\n");
}
fFenceSync->deleteFence(fFrameFences[fCurrentFenceIdx]);
}
fFrameFences[fCurrentFenceIdx] = fFenceSync->insertFence();
fCurrentFenceIdx = (fCurrentFenceIdx + 1) % SK_ARRAY_COUNT(fFrameFences);
}
void SkGLContext::testAbandon() {
if (fGL) {
fGL->abandon();
}
if (fFenceSync) {
memset(fFrameFences, 0, sizeof(fFrameFences));
}
}
SkGLContext::GLFenceSync* SkGLContext::GLFenceSync::CreateIfSupported(const SkGLContext* ctx) {
SkAutoTDelete<GLFenceSync> ret(new GLFenceSync);
if (kGL_GrGLStandard == ctx->gl()->fStandard) {
const GrGLubyte* versionStr;
SK_GL_RET(*ctx, versionStr, GetString(GR_GL_VERSION));
GrGLVersion version = GrGLGetVersionFromString(reinterpret_cast<const char*>(versionStr));
if (version < GR_GL_VER(3,2) && !ctx->gl()->hasExtension("GL_ARB_sync")) {
return NULL;
}
ret->fGLFenceSync = reinterpret_cast<GLFenceSyncProc>(
ctx->onPlatformGetProcAddress("glFenceSync"));
ret->fGLClientWaitSync = reinterpret_cast<GLClientWaitSyncProc>(
ctx->onPlatformGetProcAddress("glClientWaitSync"));
ret->fGLDeleteSync = reinterpret_cast<GLDeleteSyncProc>(
ctx->onPlatformGetProcAddress("glDeleteSync"));
} else {
if (!ctx->gl()->hasExtension("GL_APPLE_sync")) {
return NULL;
}
ret->fGLFenceSync = reinterpret_cast<GLFenceSyncProc>(
ctx->onPlatformGetProcAddress("glFenceSyncAPPLE"));
ret->fGLClientWaitSync = reinterpret_cast<GLClientWaitSyncProc>(
ctx->onPlatformGetProcAddress("glClientWaitSyncAPPLE"));
ret->fGLDeleteSync = reinterpret_cast<GLDeleteSyncProc>(
ctx->onPlatformGetProcAddress("glDeleteSyncAPPLE"));
}
if (!ret->fGLFenceSync || !ret->fGLClientWaitSync || !ret->fGLDeleteSync) {
return NULL;
}
return ret.detach();
}
SkPlatformGpuFence SkGLContext::GLFenceSync::insertFence() const {
return fGLFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
}
bool SkGLContext::GLFenceSync::flushAndWaitFence(SkPlatformGpuFence fence) const {
GLsync glsync = static_cast<GLsync>(fence);
return GL_WAIT_FAILED != fGLClientWaitSync(glsync, GL_SYNC_FLUSH_COMMANDS_BIT, -1);
}
void SkGLContext::GLFenceSync::deleteFence(SkPlatformGpuFence fence) const {
GLsync glsync = static_cast<GLsync>(fence);
fGLDeleteSync(glsync);
}
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