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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 "GrTexture.h"
#include "GrContext.h"
#include "GrGpu.h"
#include "GrRenderTarget.h"
#include "GrResourceCache.h"
bool GrTexture::readPixels(int left, int top, int width, int height,
GrPixelConfig config, void* buffer,
size_t rowBytes) {
// go through context so that all necessary flushing occurs
GrContext* context = this->getContext();
if (NULL == context) {
return false;
}
return context->readTexturePixels(this,
left, top,
width, height,
config, buffer, rowBytes);
}
void GrTexture::writePixels(int left, int top, int width, int height,
GrPixelConfig config, const void* buffer,
size_t rowBytes) {
// go through context so that all necessary flushing occurs
GrContext* context = this->getContext();
if (NULL == context) {
return;
}
context->writeTexturePixels(this,
left, top,
width, height,
config, buffer, rowBytes);
}
void GrTexture::releaseRenderTarget() {
if (NULL != fRenderTarget) {
GrAssert(fRenderTarget->asTexture() == this);
GrAssert(fDesc.fFlags & kRenderTarget_GrTextureFlagBit);
fRenderTarget->onTextureReleaseRenderTarget();
fRenderTarget->unref();
fRenderTarget = NULL;
fDesc.fFlags = fDesc.fFlags &
~(kRenderTarget_GrTextureFlagBit|kNoStencil_GrTextureFlagBit);
fDesc.fSampleCnt = 0;
}
}
void GrTexture::onAbandon() {
if (NULL != fRenderTarget) {
fRenderTarget->abandon();
}
}
void GrTexture::validateDesc() const {
if (NULL != this->asRenderTarget()) {
// This texture has a render target
GrAssert(0 != (fDesc.fFlags & kRenderTarget_GrTextureFlagBit));
if (NULL != this->asRenderTarget()->getStencilBuffer()) {
GrAssert(0 != (fDesc.fFlags & kNoStencil_GrTextureFlagBit));
} else {
GrAssert(0 == (fDesc.fFlags & kNoStencil_GrTextureFlagBit));
}
GrAssert(fDesc.fSampleCnt == this->asRenderTarget()->numSamples());
} else {
GrAssert(0 == (fDesc.fFlags & kRenderTarget_GrTextureFlagBit));
GrAssert(0 == (fDesc.fFlags & kNoStencil_GrTextureFlagBit));
GrAssert(0 == fDesc.fSampleCnt);
}
}
enum TextureBits {
kFirst_TextureBit = (GrResourceKey::kLastPublic_TypeBit << 1),
/*
* The kNPOT bit is set when the texture is NPOT and is being repeated
* but the hardware doesn't support that feature.
*/
kNPOT_TextureBit = kFirst_TextureBit,
/*
* The kFilter bit can only be set when the kNPOT flag is set and indicates
* whether the resizing of the texture should use filtering. This is
* to handle cases where the original texture is indexed to disable
* filtering.
*/
kFilter_TextureBit = kNPOT_TextureBit << 1,
/*
* The kScratch bit is set if the texture is being used as a scratch
* texture.
*/
kScratch_TextureBit = kFilter_TextureBit << 1,
};
namespace {
void gen_texture_key_values(const GrGpu* gpu,
const GrSamplerState* sampler,
GrTexture::TextureKey clientKey,
const GrTextureDesc& desc,
bool scratch,
uint32_t v[4]) {
GR_STATIC_ASSERT(sizeof(GrTexture::TextureKey) == sizeof(uint64_t));
if (scratch) {
// Instead of a client-provided key of the texture contents
// we create a key of from the descriptor.
GrAssert(0 == clientKey);
clientKey = (desc.fFlags << 8) | ((uint64_t) desc.fConfig << 32);
}
// we assume we only need 16 bits of width and height
// assert that texture creation will fail anyway if this assumption
// would cause key collisions.
GrAssert(gpu->getCaps().fMaxTextureSize <= SK_MaxU16);
v[0] = (uint32_t) (clientKey & 0xffffffffUL);
v[1] = (uint32_t) ((clientKey >> 32) & 0xffffffffUL);
v[2] = desc.fWidth | (desc.fHeight << 16);
v[3] = (desc.fSampleCnt << 24);
GrAssert(desc.fSampleCnt >= 0 && desc.fSampleCnt < 256);
if (!gpu->getCaps().fNPOTTextureTileSupport) {
bool isPow2 = GrIsPow2(desc.fWidth) && GrIsPow2(desc.fHeight);
bool tiled = NULL != sampler &&
((sampler->getWrapX() != GrSamplerState::kClamp_WrapMode) ||
(sampler->getWrapY() != GrSamplerState::kClamp_WrapMode));
if (tiled && !isPow2) {
v[3] |= kNPOT_TextureBit;
if (GrSamplerState::kNearest_Filter != sampler->getFilter()) {
v[3] |= kFilter_TextureBit;
}
}
}
if (scratch) {
v[3] |= kScratch_TextureBit;
}
v[3] |= GrResourceKey::kTexture_TypeBit;
}
}
GrResourceKey GrTexture::ComputeKey(const GrGpu* gpu,
const GrSamplerState* sampler,
TextureKey clientKey,
const GrTextureDesc& desc,
bool scratch) {
uint32_t v[4];
gen_texture_key_values(gpu, sampler, clientKey, desc, scratch, v);
return GrResourceKey(v);
}
bool GrTexture::NeedsResizing(const GrResourceKey& key) {
return 0 != (key.getValue32(3) & kNPOT_TextureBit);
}
bool GrTexture::IsScratchTexture(const GrResourceKey& key) {
return 0 != (key.getValue32(3) & kScratch_TextureBit);
}
bool GrTexture::NeedsFiltering(const GrResourceKey& key) {
return 0 != (key.getValue32(3) & kFilter_TextureBit);
}
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