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/*
* Copyright (C) 2015 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.
*/
#include "GlopBuilder.h"
#include "Caches.h"
#include "Glop.h"
#include "Matrix.h"
#include "renderstate/MeshState.h"
#include "renderstate/RenderState.h"
#include "SkiaShader.h"
#include "Texture.h"
#include "utils/PaintUtils.h"
#include "VertexBuffer.h"
#include <GLES2/gl2.h>
#include <SkPaint.h>
namespace android {
namespace uirenderer {
#define TRIGGER_STAGE(stageFlag) \
LOG_ALWAYS_FATAL_IF(stageFlag & mStageFlags, "Stage %d cannot be run twice"); \
mStageFlags = static_cast<StageFlags>(mStageFlags | stageFlag)
GlopBuilder::GlopBuilder(RenderState& renderState, Caches& caches, Glop* outGlop)
: mRenderState(renderState)
, mCaches(caches)
, mOutGlop(outGlop){
mStageFlags = kInitialStage;
}
GlopBuilder& GlopBuilder::setMeshVertexBuffer(const VertexBuffer& vertexBuffer, bool shadowInterp) {
TRIGGER_STAGE(kMeshStage);
const VertexBuffer::MeshFeatureFlags flags = vertexBuffer.getMeshFeatureFlags();
bool alphaVertex = flags & VertexBuffer::kAlpha;
bool indices = flags & VertexBuffer::kIndices;
mOutGlop->mesh.vertexFlags = alphaVertex ? kAlpha_Attrib : kNone_Attrib;
mOutGlop->mesh.primitiveMode = GL_TRIANGLE_STRIP;
mOutGlop->mesh.vertexBufferObject = 0;
mOutGlop->mesh.vertices = vertexBuffer.getBuffer();
mOutGlop->mesh.indexBufferObject = 0;
mOutGlop->mesh.indices = vertexBuffer.getIndices();
mOutGlop->mesh.vertexCount = indices
? vertexBuffer.getIndexCount() : vertexBuffer.getVertexCount();
mOutGlop->mesh.stride = alphaVertex ? kAlphaVertexStride : kVertexStride;
mDescription.hasVertexAlpha = alphaVertex;
mDescription.useShadowAlphaInterp = shadowInterp;
return *this;
}
GlopBuilder& GlopBuilder::setMeshUnitQuad() {
TRIGGER_STAGE(kMeshStage);
mOutGlop->mesh.vertexFlags = kNone_Attrib;
mOutGlop->mesh.primitiveMode = GL_TRIANGLE_STRIP;
mOutGlop->mesh.vertexBufferObject = mRenderState.meshState().getUnitQuadVBO();
mOutGlop->mesh.vertices = nullptr;
mOutGlop->mesh.indexBufferObject = 0;
mOutGlop->mesh.indices = nullptr;
mOutGlop->mesh.vertexCount = 4;
mOutGlop->mesh.stride = kTextureVertexStride;
return *this;
}
GlopBuilder& GlopBuilder::setTransform(const Matrix4& ortho,
const Matrix4& transform, bool fudgingOffset) {
TRIGGER_STAGE(kTransformStage);
mOutGlop->transform.ortho.load(ortho);
mOutGlop->transform.canvas.load(transform);
mOutGlop->transform.fudgingOffset = fudgingOffset;
return *this;
}
GlopBuilder& GlopBuilder::setModelViewMapUnitToRect(const Rect destination) {
TRIGGER_STAGE(kModelViewStage);
mOutGlop->transform.modelView.loadTranslate(destination.left, destination.top, 0.0f);
mOutGlop->transform.modelView.scale(destination.getWidth(), destination.getHeight(), 1.0f);
mOutGlop->bounds = destination;
return *this;
}
GlopBuilder& GlopBuilder::setModelViewOffsetRect(float offsetX, float offsetY, const Rect source) {
TRIGGER_STAGE(kModelViewStage);
mOutGlop->transform.modelView.loadTranslate(offsetX, offsetY, 0.0f);
mOutGlop->bounds = source;
mOutGlop->bounds.translate(offsetX, offsetY);
return *this;
}
GlopBuilder& GlopBuilder::setPaint(const SkPaint* paint, float alphaScale) {
TRIGGER_STAGE(kFillStage);
// TODO: support null paint
const SkShader* shader = paint->getShader();
const SkColorFilter* colorFilter = paint->getColorFilter();
SkXfermode::Mode mode = PaintUtils::getXfermode(paint->getXfermode());
if (mode != SkXfermode::kClear_Mode) {
int color = paint->getColor();
float alpha = (SkColorGetA(color) / 255.0f) * alphaScale;
if (!shader) {
float colorScale = alpha / 255.0f;
mOutGlop->fill.color = {
alpha,
colorScale * SkColorGetR(color),
colorScale * SkColorGetG(color),
colorScale * SkColorGetB(color)
};
} else {
mOutGlop->fill.color = { alpha, 1, 1, 1 };
}
} else {
mOutGlop->fill.color = { 1, 0, 0, 0 };
}
const bool SWAP_SRC_DST = false;
mOutGlop->blend = { GL_ZERO, GL_ZERO };
if (mOutGlop->fill.color.a < 1.0f
|| PaintUtils::isBlendedShader(shader)
|| PaintUtils::isBlendedColorFilter(colorFilter)
|| mode != SkXfermode::kSrcOver_Mode) {
if (CC_LIKELY(mode <= SkXfermode::kScreen_Mode)) {
Blend::getFactors(mode, SWAP_SRC_DST,
&mOutGlop->blend.src, &mOutGlop->blend.dst);
} else {
// These blend modes are not supported by OpenGL directly and have
// to be implemented using shaders. Since the shader will perform
// the blending, don't enable GL blending off here
// If the blend mode cannot be implemented using shaders, fall
// back to the default SrcOver blend mode instead
if (CC_UNLIKELY(mCaches.extensions().hasFramebufferFetch())) {
mDescription.framebufferMode = mode;
mDescription.swapSrcDst = SWAP_SRC_DST;
// blending in shader, don't enable
} else {
// unsupported
Blend::getFactors(SkXfermode::kSrcOver_Mode, SWAP_SRC_DST,
&mOutGlop->blend.src, &mOutGlop->blend.dst);
}
}
}
if (shader) {
SkiaShader::describe(&mCaches, mDescription, mCaches.extensions(), *shader);
// TODO: store shader data
LOG_ALWAYS_FATAL("shaders not yet supported");
}
if (colorFilter) {
SkColor color;
SkXfermode::Mode mode;
SkScalar srcColorMatrix[20];
if (colorFilter->asColorMode(&color, &mode)) {
mOutGlop->fill.filterMode = mDescription.colorOp = ProgramDescription::kColorBlend;
mDescription.colorMode = mode;
const float alpha = SkColorGetA(color) / 255.0f;
float colorScale = alpha / 255.0f;
mOutGlop->fill.filter.color = {
alpha,
colorScale * SkColorGetR(color),
colorScale * SkColorGetG(color),
colorScale * SkColorGetB(color),
};
} else if (colorFilter->asColorMatrix(srcColorMatrix)) {
mOutGlop->fill.filterMode = mDescription.colorOp = ProgramDescription::kColorMatrix;
float* colorMatrix = mOutGlop->fill.filter.matrix.matrix;
memcpy(colorMatrix, srcColorMatrix, 4 * sizeof(float));
memcpy(&colorMatrix[4], &srcColorMatrix[5], 4 * sizeof(float));
memcpy(&colorMatrix[8], &srcColorMatrix[10], 4 * sizeof(float));
memcpy(&colorMatrix[12], &srcColorMatrix[15], 4 * sizeof(float));
// Skia uses the range [0..255] for the addition vector, but we need
// the [0..1] range to apply the vector in GLSL
float* colorVector = mOutGlop->fill.filter.matrix.vector;
colorVector[0] = srcColorMatrix[4] / 255.0f;
colorVector[1] = srcColorMatrix[9] / 255.0f;
colorVector[2] = srcColorMatrix[14] / 255.0f;
colorVector[3] = srcColorMatrix[19] / 255.0f;
}
} else {
mOutGlop->fill.filterMode = ProgramDescription::kColorNone;
}
return *this;
}
void GlopBuilder::build() {
LOG_ALWAYS_FATAL_IF(mStageFlags != kAllStages, "glop not fully prepared!");
mDescription.modulate = mOutGlop->fill.color.a < 1.0f;
mOutGlop->fill.program = mCaches.programCache.get(mDescription);
mOutGlop->transform.canvas.mapRect(mOutGlop->bounds);
}
} /* namespace uirenderer */
} /* namespace android */
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