/*
 * 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_CACHES_H
#define ANDROID_HWUI_CACHES_H

#ifndef LOG_TAG
    #define LOG_TAG "OpenGLRenderer"
#endif

#include <utils/Singleton.h>

#include <cutils/compiler.h>

#include "Extensions.h"
#include "FontRenderer.h"
#include "GammaFontRenderer.h"
#include "TextureCache.h"
#include "LayerCache.h"
#include "GradientCache.h"
#include "PatchCache.h"
#include "ProgramCache.h"
#include "ShapeCache.h"
#include "PathCache.h"
#include "TextDropShadowCache.h"
#include "FboCache.h"
#include "ResourceCache.h"

namespace android {
namespace uirenderer {

///////////////////////////////////////////////////////////////////////////////
// Globals
///////////////////////////////////////////////////////////////////////////////

#define REQUIRED_TEXTURE_UNITS_COUNT 3

#define REGION_MESH_QUAD_COUNT 512

// Generates simple and textured vertices
#define FV(x, y, u, v) { { x, y }, { u, v } }

// This array is never used directly but used as a memcpy source in the
// OpenGLRenderer constructor
static const TextureVertex gMeshVertices[] = {
        FV(0.0f, 0.0f, 0.0f, 0.0f),
        FV(1.0f, 0.0f, 1.0f, 0.0f),
        FV(0.0f, 1.0f, 0.0f, 1.0f),
        FV(1.0f, 1.0f, 1.0f, 1.0f)
};
static const GLsizei gMeshStride = sizeof(TextureVertex);
static const GLsizei gVertexStride = sizeof(Vertex);
static const GLsizei gAlphaVertexStride = sizeof(AlphaVertex);
static const GLsizei gAAVertexStride = sizeof(AAVertex);
static const GLsizei gMeshTextureOffset = 2 * sizeof(float);
static const GLsizei gVertexAAWidthOffset = 2 * sizeof(float);
static const GLsizei gVertexAALengthOffset = 3 * sizeof(float);
static const GLsizei gMeshCount = 4;

static const GLenum gTextureUnits[] = {
    GL_TEXTURE0,
    GL_TEXTURE1,
    GL_TEXTURE2
};

///////////////////////////////////////////////////////////////////////////////
// Debug
///////////////////////////////////////////////////////////////////////////////

struct CacheLogger {
    CacheLogger() {
        INIT_LOGD("Creating OpenGL renderer caches");
    }
}; // struct CacheLogger

///////////////////////////////////////////////////////////////////////////////
// Caches
///////////////////////////////////////////////////////////////////////////////

class ANDROID_API Caches: public Singleton<Caches> {
    Caches();

    friend class Singleton<Caches>;

    CacheLogger mLogger;

public:
    enum FlushMode {
        kFlushMode_Layers = 0,
        kFlushMode_Moderate,
        kFlushMode_Full
    };

    /**
     * Initializes the cache.
     */
    void init();

    /**
     * Flush the cache.
     *
     * @param mode Indicates how much of the cache should be flushed
     */
    void flush(FlushMode mode);

    /**
     * Destroys all resources associated with this cache. This should
     * be called after a flush(kFlushMode_Full).
     */
    void terminate();

    /**
     * Indicates whether the renderer is in debug mode.
     * This debug mode provides limited information to app developers.
     */
    DebugLevel getDebugLevel() const {
        return mDebugLevel;
    }

    /**
     * Call this on each frame to ensure that garbage is deleted from
     * GPU memory.
     */
    void clearGarbage();

    /**
     * Can be used to delete a layer from a non EGL thread.
     */
    void deleteLayerDeferred(Layer* layer);

    /**
     * Binds the VBO used to render simple textured quads.
     */
    bool bindMeshBuffer();

    /**
     * Binds the specified VBO if needed.
     */
    bool bindMeshBuffer(const GLuint buffer);

    /**
     * Unbinds the VBO used to render simple textured quads.
     */
    bool unbindMeshBuffer();

    bool bindIndicesBuffer(const GLuint buffer);
    bool unbindIndicesBuffer();

    /**
     * Binds an attrib to the specified float vertex pointer.
     * Assumes a stride of gMeshStride and a size of 2.
     */
    void bindPositionVertexPointer(bool force, GLuint slot, GLvoid* vertices,
            GLsizei stride = gMeshStride);

    /**
     * Binds an attrib to the specified float vertex pointer.
     * Assumes a stride of gMeshStride and a size of 2.
     */
    void bindTexCoordsVertexPointer(bool force, GLuint slot, GLvoid* vertices);

    /**
     * Resets the vertex pointers.
     */
    void resetVertexPointers();
    void resetTexCoordsVertexPointer();

    void enableTexCoordsVertexArray();
    void disbaleTexCoordsVertexArray();

    /**
     * Activate the specified texture unit. The texture unit must
     * be specified using an integer number (0 for GL_TEXTURE0 etc.)
     */
    void activeTexture(GLuint textureUnit);

    /**
     * Sets the scissor for the current surface.
     */
    void setScissor(GLint x, GLint y, GLint width, GLint height);

    /**
     * Resets the scissor state.
     */
    void resetScissor();

    /**
     * Returns the mesh used to draw regions. Calling this method will
     * bind a VBO of type GL_ELEMENT_ARRAY_BUFFER that contains the
     * indices for the region mesh.
     */
    TextureVertex* getRegionMesh();

    /**
     * Displays the memory usage of each cache and the total sum.
     */
    void dumpMemoryUsage();
    void dumpMemoryUsage(String8& log);

    bool blend;
    GLenum lastSrcMode;
    GLenum lastDstMode;
    Program* currentProgram;

    // VBO to draw with
    GLuint meshBuffer;

    // GL extensions
    Extensions extensions;

    // Misc
    GLint maxTextureSize;

    TextureCache textureCache;
    LayerCache layerCache;
    GradientCache gradientCache;
    ProgramCache programCache;
    PathCache pathCache;
    RoundRectShapeCache roundRectShapeCache;
    CircleShapeCache circleShapeCache;
    OvalShapeCache ovalShapeCache;
    RectShapeCache rectShapeCache;
    ArcShapeCache arcShapeCache;
    PatchCache patchCache;
    TextDropShadowCache dropShadowCache;
    FboCache fboCache;
    GammaFontRenderer fontRenderer;
    ResourceCache resourceCache;

private:
    GLuint mCurrentBuffer;
    GLuint mCurrentIndicesBuffer;
    void* mCurrentPositionPointer;
    void* mCurrentTexCoordsPointer;

    bool mTexCoordsArrayEnabled;

    GLuint mTextureUnit;

    GLint mScissorX;
    GLint mScissorY;
    GLint mScissorWidth;
    GLint mScissorHeight;

    // Used to render layers
    TextureVertex* mRegionMesh;
    GLuint mRegionMeshIndices;

    mutable Mutex mGarbageLock;
    Vector<Layer*> mLayerGarbage;

    DebugLevel mDebugLevel;
    bool mInitialized;
}; // class Caches

}; // namespace uirenderer
}; // namespace android

#endif // ANDROID_HWUI_CACHES_H