55bfb4e728
Basically we compute the shadow as a strip of triangles, whose alpha value is the strength of the shadow. We use the normal to extend the geometry. And we use static function and try to avoid new/malloc in the computation. Change-Id: I382286f1cad351bd5ff983f76f446c075819dcaf
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
/*
|
|
* Copyright (C) 2012 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef ANDROID_HWUI_VERTEX_BUFFER_H
|
|
#define ANDROID_HWUI_VERTEX_BUFFER_H
|
|
|
|
|
|
namespace android {
|
|
namespace uirenderer {
|
|
|
|
class VertexBuffer {
|
|
public:
|
|
VertexBuffer():
|
|
mBuffer(0),
|
|
mVertexCount(0),
|
|
mCleanupMethod(NULL)
|
|
{}
|
|
|
|
~VertexBuffer() {
|
|
if (mCleanupMethod) mCleanupMethod(mBuffer);
|
|
}
|
|
|
|
/**
|
|
This should be the only method used by the Tessellator. Subsequent calls to
|
|
alloc will allocate space within the first allocation (useful if you want to
|
|
eventually allocate multiple regions within a single VertexBuffer, such as
|
|
with PathTessellator::tesselateLines())
|
|
*/
|
|
template <class TYPE>
|
|
TYPE* alloc(int vertexCount) {
|
|
if (mVertexCount) {
|
|
TYPE* reallocBuffer = (TYPE*)mReallocBuffer;
|
|
// already have allocated the buffer, re-allocate space within
|
|
if (mReallocBuffer != mBuffer) {
|
|
// not first re-allocation, leave space for degenerate triangles to separate strips
|
|
reallocBuffer += 2;
|
|
}
|
|
mReallocBuffer = reallocBuffer + vertexCount;
|
|
return reallocBuffer;
|
|
}
|
|
mVertexCount = vertexCount;
|
|
mReallocBuffer = mBuffer = (void*)new TYPE[vertexCount];
|
|
mCleanupMethod = &(cleanup<TYPE>);
|
|
|
|
return (TYPE*)mBuffer;
|
|
}
|
|
|
|
template <class TYPE>
|
|
void copyInto(const VertexBuffer& srcBuffer, float xOffset, float yOffset) {
|
|
int verticesToCopy = srcBuffer.getVertexCount();
|
|
|
|
TYPE* dst = alloc<TYPE>(verticesToCopy);
|
|
TYPE* src = (TYPE*)srcBuffer.getBuffer();
|
|
|
|
for (int i = 0; i < verticesToCopy; i++) {
|
|
TYPE::copyWithOffset(&dst[i], src[i], xOffset, yOffset);
|
|
}
|
|
}
|
|
|
|
const void* getBuffer() const { return mBuffer; }
|
|
unsigned int getVertexCount() const { return mVertexCount; }
|
|
|
|
template <class TYPE>
|
|
void createDegenerateSeparators(int allocSize) {
|
|
TYPE* end = (TYPE*)mBuffer + mVertexCount;
|
|
for (TYPE* degen = (TYPE*)mBuffer + allocSize; degen < end; degen += 2 + allocSize) {
|
|
memcpy(degen, degen - 1, sizeof(TYPE));
|
|
memcpy(degen + 1, degen + 2, sizeof(TYPE));
|
|
}
|
|
}
|
|
|
|
private:
|
|
template <class TYPE>
|
|
static void cleanup(void* buffer) {
|
|
delete[] (TYPE*)buffer;
|
|
}
|
|
|
|
void* mBuffer;
|
|
unsigned int mVertexCount;
|
|
|
|
void* mReallocBuffer; // used for multi-allocation
|
|
|
|
void (*mCleanupMethod)(void*);
|
|
};
|
|
|
|
}; // namespace uirenderer
|
|
}; // namespace android
|
|
|
|
#endif // ANDROID_HWUI_VERTEX_BUFFER_H
|