/*
 * Copyright (c) 2020 - 2024 the ThorVG project. All rights reserved.

 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:

 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef _TVG_GL_GEOMETRY_H_
#define _TVG_GL_GEOMETRY_H_

#include <vector>
#include "tvgGlCommon.h"
#include "tvgMath.h"

#define MIN_GL_STROKE_WIDTH 1.0f

#define MVP_MATRIX(w, h) \
    float mvp[4*4] = { \
        2.f / w, 0.0, 0.0f, 0.0f, \
        0.0, -2.f / h, 0.0f, 0.0f, \
        0.0f, 0.0f, -1.f, 0.0f, \
        -1.f, 1.f, 0.0f, 1.0f \
    };

#define MULTIPLY_MATRIX(A, B, transform) \
    for(auto i = 0; i < 4; ++i) \
    { \
        for(auto j = 0; j < 4; ++j) \
        { \
            float sum = 0.0; \
            for (auto k = 0; k < 4; ++k) \
                sum += A[k*4+i] * B[j*4+k]; \
            transform[j*4+i] = sum; \
        } \
    }

/**
 *  mat3x3               mat4x4
 *
 * [ e11 e12 e13 ]     [ e11 e12 0 e13 ]
 * [ e21 e22 e23 ] =>  [ e21 e22 0 e23 ]
 * [ e31 e32 e33 ]     [ 0   0   1  0  ]
 *                     [ e31 e32 0 e33 ]
 *
 */

// All GPU use 4x4 matrix with column major order
#define GET_MATRIX44(mat3, mat4)    \
    do {                            \
        mat4[0] = mat3.e11;         \
        mat4[1] = mat3.e21;         \
        mat4[2] = 0;                \
        mat4[3] = mat3.e31;         \
        mat4[4] = mat3.e12;         \
        mat4[5] = mat3.e22;         \
        mat4[6] = 0;                \
        mat4[7] = mat3.e32;         \
        mat4[8] = 0;                \
        mat4[9] = 0;                \
        mat4[10] = 1;               \
        mat4[11] = 0;               \
        mat4[12] = mat3.e13;        \
        mat4[13] = mat3.e23;        \
        mat4[14] = 0;               \
        mat4[15] = mat3.e33;        \
    } while (false)

class GlStageBuffer;
class GlRenderTask;

class GlGeometry
{
public:
    GlGeometry() = default;
    ~GlGeometry();

    bool tesselate(const RenderShape& rshape, RenderUpdateFlag flag);
    bool tesselate(const RenderSurface* image, RenderUpdateFlag flag);
    void disableVertex(uint32_t location);
    bool draw(GlRenderTask* task, GlStageBuffer* gpuBuffer, RenderUpdateFlag flag);
    void updateTransform(const Matrix& m);
    void setViewport(const RenderRegion& viewport);
    const RenderRegion& getViewport();
    const Matrix& getTransformMatrix();
    GlStencilMode getStencilMode(RenderUpdateFlag flag);
    RenderRegion getBounds() const;

private:
    RenderRegion viewport = {};
    Array<float> fillVertex = {};
    Array<float> strokeVertex = {};
    Array<uint32_t> fillIndex = {};
    Array<uint32_t> strokeIndex = {};
    Matrix mMatrix = {};

    FillRule mFillRule = FillRule::NonZero;
    RenderRegion mBounds = {};
};

#endif /* _TVG_GL_GEOMETRY_H_ */