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/*
* Copyright (C) 2010 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_SKIA_SHADER_H
#define ANDROID_HWUI_SKIA_SHADER_H
#include "FloatColor.h"
#include "Matrix.h"
#include <GLES2/gl2.h>
#include <SkShader.h>
#include <SkXfermode.h>
#include <cutils/compiler.h>
namespace android {
namespace uirenderer {
class Caches;
class Extensions;
class Layer;
class Texture;
struct ProgramDescription;
/**
* Type of Skia shader in use.
*
* Note that kBitmap | kGradient = kCompose, since Compose implies
* both its component types are in use simultaneously. No other
* composition of multiple types is supported.
*/
enum SkiaShaderType {
kNone_SkiaShaderType = 0,
kBitmap_SkiaShaderType = 1,
kGradient_SkiaShaderType = 2,
kCompose_SkiaShaderType = kBitmap_SkiaShaderType | kGradient_SkiaShaderType,
kLayer_SkiaShaderType = 4,
};
struct SkiaShaderData {
SkiaShaderType skiaShaderType;
struct BitmapShaderData {
Texture* bitmapTexture;
GLuint bitmapSampler;
GLenum wrapS;
GLenum wrapT;
Matrix4 textureTransform;
float textureDimension[2];
} bitmapData;
struct GradientShaderData {
Matrix4 screenSpace;
GLuint ditherSampler;
// simple gradient
FloatColor startColor;
FloatColor endColor;
// complex gradient
Texture* gradientTexture;
GLuint gradientSampler;
GLenum wrapST;
} gradientData;
struct LayerShaderData {
Layer* layer;
GLuint bitmapSampler;
GLenum wrapS;
GLenum wrapT;
Matrix4 textureTransform;
float textureDimension[2];
} layerData;
};
class SkiaShader {
public:
static SkiaShaderType getType(const SkShader& shader);
static void describe(Caches* caches, ProgramDescription& description,
const Extensions& extensions, const SkShader& shader);
static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
// new SkiaShader interaction model - store into ShaderData, and apply to Caches/Program/GL
static void store(Caches& caches, const SkShader* shader, const Matrix4& modelViewMatrix,
GLuint* textureUnit, ProgramDescription* description,
SkiaShaderData* outData);
static void apply(Caches& caches, const SkiaShaderData& data);
};
class InvalidSkiaShader {
public:
static void describe(Caches* caches, ProgramDescription& description,
const Extensions& extensions, const SkShader& shader) {
// This shader is unsupported. Skip it.
}
static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
GLuint* textureUnit, const Extensions& extensions, const SkShader& shader) {
// This shader is unsupported. Skip it.
}
};
/**
* A shader that draws a layer.
*/
class SkiaLayerShader {
public:
static void describe(Caches* caches, ProgramDescription& description,
const Extensions& extensions, const SkShader& shader);
static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
}; // class SkiaLayerShader
/**
* A shader that draws a bitmap.
*/
class SkiaBitmapShader {
public:
static void describe(Caches* caches, ProgramDescription& description,
const Extensions& extensions, const SkShader& shader);
static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
}; // class SkiaBitmapShader
/**
* A shader that draws one of three types of gradient, depending on shader param.
*/
class SkiaGradientShader {
public:
static void describe(Caches* caches, ProgramDescription& description,
const Extensions& extensions, const SkShader& shader);
static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
};
/**
* A shader that draws two shaders, composited with an xfermode.
*/
class SkiaComposeShader {
public:
static void describe(Caches* caches, ProgramDescription& description,
const Extensions& extensions, const SkShader& shader);
static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
}; // class SkiaComposeShader
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_SKIA_SHADER_H
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