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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.
*/
#ifndef GrContext_impl_DEFINED
#define GrContext_impl_DEFINED
template <typename POS_SRC, typename TEX_SRC,
typename COL_SRC, typename IDX_SRC>
inline void GrContext::drawCustomVertices(const GrPaint& paint,
GrPrimitiveType primitiveType,
const POS_SRC& posSrc,
const TEX_SRC* texCoordSrc,
const COL_SRC* colorSrc,
const IDX_SRC* idxSrc) {
GrDrawTarget::AutoReleaseGeometry geo;
GrDrawTarget* target = this->prepareToDraw(paint, kUnbuffered_DrawCategory);
bool hasTexCoords[GrPaint::kTotalStages] = {
NULL != texCoordSrc, // texCoordSrc provides explicit stage 0 coords
0 // remaining stages use positions
};
GrVertexLayout layout = PaintStageVertexLayoutBits(paint, hasTexCoords);
if (NULL != colorSrc) {
layout |= GrDrawTarget::kColor_VertexLayoutBit;
}
int vertexCount = posSrc.count();
int indexCount = (NULL != idxSrc) ? idxSrc->count() : 0;
if (!geo.set(target, layout, vertexCount, indexCount)) {
GrPrintf("Failed to get space for vertices!");
return;
}
int texOffsets[GrDrawTarget::kMaxTexCoords];
int colorOffset;
int vsize = GrDrawTarget::VertexSizeAndOffsetsByIdx(layout,
texOffsets,
&colorOffset);
void* curVertex = geo.vertices();
for (int i = 0; i < vertexCount; ++i) {
posSrc.writeValue(i, (GrPoint*)curVertex);
if (texOffsets[0] > 0) {
texCoordSrc->writeValue(i, (GrPoint*)((intptr_t)curVertex + texOffsets[0]));
}
if (colorOffset > 0) {
colorSrc->writeValue(i, (GrColor*)((intptr_t)curVertex + colorOffset));
}
curVertex = (void*)((intptr_t)curVertex + vsize);
}
uint16_t* indices = (uint16_t*) geo.indices();
for (int i = 0; i < indexCount; ++i) {
idxSrc->writeValue(i, indices + i);
}
// we don't currently apply offscreen AA to this path. Need improved
// management of GrDrawTarget's geometry to avoid copying points per-tile.
if (NULL == idxSrc) {
target->drawNonIndexed(primitiveType, 0, vertexCount);
} else {
target->drawIndexed(primitiveType, 0, 0, vertexCount, indexCount);
}
}
class GrNullTexCoordSource {
public:
void writeValue(int i, GrPoint* dstCoord) const { GrAssert(false); }
};
class GrNullColorSource {
public:
void writeValue(int i, GrColor* dstColor) const { GrAssert(false); }
};
class GrNullIndexSource {
public:
void writeValue(int i, uint16_t* dstIndex) const { GrAssert(false); }
int count() const { GrAssert(false); return 0; }
};
template <typename POS_SRC>
inline void GrContext::drawCustomVertices(const GrPaint& paint,
GrPrimitiveType primitiveType,
const POS_SRC& posSrc) {
this->drawCustomVertices<POS_SRC,
GrNullTexCoordSource,
GrNullColorSource,
GrNullIndexSource>(paint, primitiveType, posSrc,
NULL, NULL, NULL);
}
template <typename POS_SRC, typename TEX_SRC>
inline void GrContext::drawCustomVertices(const GrPaint& paint,
GrPrimitiveType primitiveType,
const POS_SRC& posSrc,
const TEX_SRC* texCoordSrc) {
this->drawCustomVertices<POS_SRC, TEX_SRC,
GrNullColorSource,
GrNullIndexSource>(paint, primitiveType, posSrc,
texCoordSrc, NULL, NULL);
}
template <typename POS_SRC, typename TEX_SRC, typename COL_SRC>
inline void GrContext::drawCustomVertices(const GrPaint& paint,
GrPrimitiveType primitiveType,
const POS_SRC& posSrc,
const TEX_SRC* texCoordSrc,
const COL_SRC* colorSrc) {
drawCustomVertices<POS_SRC, TEX_SRC, COL_SRC,
GrNullIndexSource>(paint, primitiveType, posSrc,
texCoordSrc, colorSrc, NULL);
}
#endif
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