Glop SkiaShader support

Change-Id: I894a0b62701bd02367ab970813e4c332147351a2

1 files changed, 295 insertions, 6 deletions

diff --git a/libs/hwui/SkiaShader.cpp b/libs/hwui/SkiaShader.cpp
index 9c929da..81531e8 100644
--- a/libs/hwui/SkiaShader.cpp
+++ b/libs/hwui/SkiaShader.cpp
@@ -16,17 +16,17 @@
 
 #define LOG_TAG "OpenGLRenderer"
 
-#include <utils/Log.h>
-
-#include <SkMatrix.h>
+#include "SkiaShader.h"
 
 #include "Caches.h"
 #include "Extensions.h"
 #include "Layer.h"
 #include "Matrix.h"
-#include "SkiaShader.h"
 #include "Texture.h"
 
+#include <SkMatrix.h>
+#include <utils/Log.h>
+
 namespace android {
 namespace uirenderer {
 
@@ -34,7 +34,7 @@ namespace uirenderer {
 // Support
 ///////////////////////////////////////////////////////////////////////////////
 
-static const GLint gTileModes[] = {
+static const GLenum gTileModes[] = {
         GL_CLAMP_TO_EDGE,   // == SkShader::kClamp_TileMode
         GL_REPEAT,          // == SkShader::kRepeat_Mode
         GL_MIRRORED_REPEAT  // == SkShader::kMirror_TileMode
@@ -56,6 +56,10 @@ static inline void bindUniformColor(int slot, uint32_t color) {
             a);
 }
 
+static inline void bindUniformColor(int slot, FloatColor color) {
+    glUniform4fv(slot, 1, reinterpret_cast<const float*>(&color));
+}
+
 static inline void bindTexture(Caches* caches, Texture* texture, GLenum wrapS, GLenum wrapT) {
     caches->textureState().bindTexture(texture->id);
     texture->setWrapST(wrapS, wrapT);
@@ -270,7 +274,7 @@ void SkiaBitmapShader::setupProgram(Caches* caches, const mat4& modelViewMatrix,
     }
 
     GLuint textureSlot = (*textureUnit)++;
-    Caches::getInstance().textureState().activateTexture(textureSlot);
+    caches->textureState().activateTexture(textureSlot);
 
     BitmapShaderInfo shaderInfo;
     if (!bitmapShaderHelper(caches, nullptr, &shaderInfo, extensions, bitmap, xy)) {
@@ -470,5 +474,290 @@ void SkiaComposeShader::setupProgram(Caches* caches, const mat4& modelViewMatrix
     SkiaShader::setupProgram(caches, transform, textureUnit, extensions, *rec.fShaderB);
 }
 
+///////////////////////////////////////////////////////////////////////////////
+// Store / apply
+///////////////////////////////////////////////////////////////////////////////
+
+bool tryStoreGradient(Caches& caches, const SkShader& shader, const Matrix4 modelViewMatrix,
+        GLuint* textureUnit, ProgramDescription* description,
+        SkiaShaderData::GradientShaderData* outData) {
+    SkShader::GradientInfo gradInfo;
+    gradInfo.fColorCount = 0;
+    gradInfo.fColors = nullptr;
+    gradInfo.fColorOffsets = nullptr;
+
+    SkMatrix unitMatrix;
+    switch (shader.asAGradient(&gradInfo)) {
+        case SkShader::kLinear_GradientType:
+            description->gradientType = ProgramDescription::kGradientLinear;
+
+            toUnitMatrix(gradInfo.fPoint, &unitMatrix);
+            break;
+        case SkShader::kRadial_GradientType:
+            description->gradientType = ProgramDescription::kGradientCircular;
+
+            toCircularUnitMatrix(gradInfo.fPoint[0].fX, gradInfo.fPoint[0].fY,
+                    gradInfo.fRadius[0], &unitMatrix);
+            break;
+        case SkShader::kSweep_GradientType:
+            description->gradientType = ProgramDescription::kGradientSweep;
+
+            toSweepUnitMatrix(gradInfo.fPoint[0].fX, gradInfo.fPoint[0].fY, &unitMatrix);
+            break;
+        default:
+            // Do nothing. This shader is unsupported.
+            return false;
+    }
+    description->hasGradient = true;
+    description->isSimpleGradient = isSimpleGradient(gradInfo);
+
+    computeScreenSpaceMatrix(outData->screenSpace, unitMatrix,
+            shader.getLocalMatrix(), modelViewMatrix);
+
+    // re-query shader to get full color / offset data
+    std::unique_ptr<SkColor[]> colorStorage(new SkColor[gradInfo.fColorCount]);
+    std::unique_ptr<SkScalar[]> colorOffsets(new SkScalar[gradInfo.fColorCount]);
+    gradInfo.fColors = &colorStorage[0];
+    gradInfo.fColorOffsets = &colorOffsets[0];
+    shader.asAGradient(&gradInfo);
+
+    if (CC_UNLIKELY(!isSimpleGradient(gradInfo))) {
+        outData->gradientSampler = (*textureUnit)++;
+
+#ifndef SK_SCALAR_IS_FLOAT
+    #error Need to convert gradInfo.fColorOffsets to float!
+#endif
+        outData->gradientTexture = caches.gradientCache.get(
+                gradInfo.fColors, gradInfo.fColorOffsets, gradInfo.fColorCount);
+        outData->wrapST = gTileModes[gradInfo.fTileMode];
+    } else {
+        outData->gradientSampler = 0;
+        outData->gradientTexture = nullptr;
+
+        outData->startColor.set(gradInfo.fColors[0]);
+        outData->endColor.set(gradInfo.fColors[1]);
+    }
+
+    outData->ditherSampler = (*textureUnit)++;
+    return true;
+}
+
+void applyGradient(Caches& caches, const SkiaShaderData::GradientShaderData& data) {
+    if (CC_UNLIKELY(data.gradientTexture)) {
+        caches.textureState().activateTexture(data.gradientSampler);
+        bindTexture(&caches, data.gradientTexture, data.wrapST, data.wrapST);
+        glUniform1i(caches.program().getUniform("gradientSampler"), data.gradientSampler);
+    } else {
+        bindUniformColor(caches.program().getUniform("startColor"), data.startColor);
+        bindUniformColor(caches.program().getUniform("endColor"), data.endColor);
+    }
+
+    // TODO: remove sampler slot incrementing from dither.setupProgram,
+    // since this assignment of slots is done at store, not apply time
+    GLuint ditherSampler = data.ditherSampler;
+    caches.dither.setupProgram(caches.program(), &ditherSampler);
+    glUniformMatrix4fv(caches.program().getUniform("screenSpace"), 1,
+            GL_FALSE, &data.screenSpace.data[0]);
+}
+
+bool tryStoreBitmap(Caches& caches, const SkShader& shader, const Matrix4& modelViewMatrix,
+        GLuint* textureUnit, ProgramDescription* description,
+        SkiaShaderData::BitmapShaderData* outData) {
+    SkBitmap bitmap;
+    SkShader::TileMode xy[2];
+    if (shader.asABitmap(&bitmap, nullptr, xy) != SkShader::kDefault_BitmapType) {
+        return false;
+    }
+
+    outData->bitmapTexture = caches.textureCache.get(&bitmap);
+    if (!outData->bitmapTexture) return false;
+
+    outData->bitmapSampler = (*textureUnit)++;
+
+    const float width = outData->bitmapTexture->width;
+    const float height = outData->bitmapTexture->height;
+
+    description->hasBitmap = true;
+    if (!caches.extensions().hasNPot()
+            && (!isPowerOfTwo(width) || !isPowerOfTwo(height))
+            && (xy[0] != SkShader::kClamp_TileMode || xy[1] != SkShader::kClamp_TileMode)) {
+        description->isBitmapNpot = true;
+        description->bitmapWrapS = gTileModes[xy[0]];
+        description->bitmapWrapT = gTileModes[xy[1]];
+
+        outData->wrapS = GL_CLAMP_TO_EDGE;
+        outData->wrapT = GL_CLAMP_TO_EDGE;
+    } else {
+        outData->wrapS = gTileModes[xy[0]];
+        outData->wrapT = gTileModes[xy[1]];
+    }
+
+    computeScreenSpaceMatrix(outData->textureTransform, SkMatrix::I(), shader.getLocalMatrix(),
+            modelViewMatrix);
+    outData->textureDimension[0] = 1.0f / width;
+    outData->textureDimension[1] = 1.0f / height;
+
+    return true;
+}
+
+void applyBitmap(Caches& caches, const SkiaShaderData::BitmapShaderData& data) {
+    caches.textureState().activateTexture(data.bitmapSampler);
+    bindTexture(&caches, data.bitmapTexture, data.wrapS, data.wrapT);
+    data.bitmapTexture->setFilter(GL_LINEAR);
+
+    glUniform1i(caches.program().getUniform("bitmapSampler"), data.bitmapSampler);
+    glUniformMatrix4fv(caches.program().getUniform("textureTransform"), 1, GL_FALSE,
+            &data.textureTransform.data[0]);
+    glUniform2fv(caches.program().getUniform("textureDimension"), 1, &data.textureDimension[0]);
+}
+
+SkiaShaderType getComposeSubType(const SkShader& shader) {
+    // First check for a gradient shader.
+    switch (shader.asAGradient(nullptr)) {
+        case SkShader::kNone_GradientType:
+            // Not a gradient shader. Fall through to check for other types.
+            break;
+        case SkShader::kLinear_GradientType:
+        case SkShader::kRadial_GradientType:
+        case SkShader::kSweep_GradientType:
+            return kGradient_SkiaShaderType;
+        default:
+            // This is a Skia gradient that has no SkiaShader equivalent. Return None to skip.
+            return kNone_SkiaShaderType;
+    }
+
+    // The shader is not a gradient. Check for a bitmap shader.
+    if (shader.asABitmap(nullptr, nullptr, nullptr) == SkShader::kDefault_BitmapType) {
+        return kBitmap_SkiaShaderType;
+    }
+    return kNone_SkiaShaderType;
+}
+
+void storeCompose(Caches& caches, const SkShader& bitmapShader, const SkShader& gradientShader,
+        const Matrix4& modelViewMatrix, GLuint* textureUnit,
+        ProgramDescription* description, SkiaShaderData* outData) {
+    LOG_ALWAYS_FATAL_IF(!tryStoreBitmap(caches, bitmapShader, modelViewMatrix,
+                textureUnit, description, &outData->bitmapData),
+            "failed storing bitmap shader data");
+    LOG_ALWAYS_FATAL_IF(!tryStoreGradient(caches, gradientShader, modelViewMatrix,
+                textureUnit, description, &outData->gradientData),
+            "failing storing gradient shader data");
+}
+
+bool tryStoreCompose(Caches& caches, const SkShader& shader, const Matrix4& modelViewMatrix,
+        GLuint* textureUnit, ProgramDescription* description,
+        SkiaShaderData* outData) {
+
+    SkShader::ComposeRec rec;
+    if (!shader.asACompose(&rec)) return false;
+
+    const SkiaShaderType shaderAType = getComposeSubType(*rec.fShaderA);
+    const SkiaShaderType shaderBType = getComposeSubType(*rec.fShaderB);
+
+    // check that type enum values are the 2 flags that compose the kCompose value
+    if ((shaderAType & shaderBType) != 0) return false;
+    if ((shaderAType | shaderBType) != kCompose_SkiaShaderType) return false;
+
+    mat4 transform;
+    computeScreenSpaceMatrix(transform, SkMatrix::I(), shader.getLocalMatrix(), modelViewMatrix);
+    if (shaderAType == kBitmap_SkiaShaderType) {
+        description->isBitmapFirst = true;
+        storeCompose(caches, *rec.fShaderA, *rec.fShaderB,
+                transform, textureUnit, description, outData);
+    } else {
+        description->isBitmapFirst = false;
+        storeCompose(caches, *rec.fShaderB, *rec.fShaderA,
+                transform, textureUnit, description, outData);
+    }
+    if (!SkXfermode::AsMode(rec.fMode, &description->shadersMode)) {
+        // TODO: Support other modes.
+        description->shadersMode = SkXfermode::kSrcOver_Mode;
+    }
+    return true;
+}
+
+bool tryStoreLayer(Caches& caches, const SkShader& shader, const Matrix4& modelViewMatrix,
+        GLuint* textureUnit, ProgramDescription* description,
+        SkiaShaderData::LayerShaderData* outData) {
+    Layer* layer;
+    if (!shader.asACustomShader(reinterpret_cast<void**>(&layer))) {
+        return false;
+    }
+
+    description->hasBitmap = true;
+
+    outData->bitmapSampler = (*textureUnit)++;
+
+    const float width = layer->getWidth();
+    const float height = layer->getHeight();
+
+    computeScreenSpaceMatrix(outData->textureTransform, SkMatrix::I(), shader.getLocalMatrix(),
+            modelViewMatrix);
+
+    outData->textureDimension[0] = 1.0f / width;
+    outData->textureDimension[1] = 1.0f / height;
+    return true;
+}
+
+void applyLayer(Caches& caches, const SkiaShaderData::LayerShaderData& data) {
+    caches.textureState().activateTexture(data.bitmapSampler);
+
+    data.layer->bindTexture();
+    data.layer->setWrap(GL_CLAMP_TO_EDGE);
+    data.layer->setFilter(GL_LINEAR);
+
+    glUniform1i(caches.program().getUniform("bitmapSampler"), data.bitmapSampler);
+    glUniformMatrix4fv(caches.program().getUniform("textureTransform"), 1,
+            GL_FALSE, &data.textureTransform.data[0]);
+    glUniform2fv(caches.program().getUniform("textureDimension"), 1, &data.textureDimension[0]);
+}
+
+void SkiaShader::store(Caches& caches, const SkShader* shader, const Matrix4& modelViewMatrix,
+        GLuint* textureUnit, ProgramDescription* description,
+        SkiaShaderData* outData) {
+    if (!shader) {
+        outData->skiaShaderType = kNone_SkiaShaderType;
+        return;
+    }
+
+    if (tryStoreGradient(caches, *shader, modelViewMatrix,
+            textureUnit, description, &outData->gradientData)) {
+        outData->skiaShaderType = kGradient_SkiaShaderType;
+        return;
+    }
+
+    if (tryStoreBitmap(caches, *shader, modelViewMatrix,
+            textureUnit, description, &outData->bitmapData)) {
+        outData->skiaShaderType = kBitmap_SkiaShaderType;
+        return;
+    }
+
+    if (tryStoreCompose(caches, *shader, modelViewMatrix,
+            textureUnit, description, outData)) {
+        outData->skiaShaderType = kCompose_SkiaShaderType;
+        return;
+    }
+
+    if (tryStoreLayer(caches, *shader, modelViewMatrix,
+            textureUnit, description, &outData->layerData)) {
+        outData->skiaShaderType = kLayer_SkiaShaderType;
+    }
+}
+
+void SkiaShader::apply(Caches& caches, const SkiaShaderData& data) {
+    if (!data.skiaShaderType) return;
+
+    if (data.skiaShaderType & kGradient_SkiaShaderType) {
+        applyGradient(caches, data.gradientData);
+    }
+    if (data.skiaShaderType & kBitmap_SkiaShaderType) {
+        applyBitmap(caches, data.bitmapData);
+    }
+
+    if (data.skiaShaderType == kLayer_SkiaShaderType) {
+        applyLayer(caches, data.layerData);
+    }
+}
+
 }; // namespace uirenderer
 }; // namespace android