te_renderer.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef TETRAEDGE_TE_TE_RENDERER_H
#define TETRAEDGE_TE_TE_RENDERER_H

#include "common/ptr.h"
#include "tetraedge/te/te_mesh.h"
#include "tetraedge/te/te_color.h"
#include "tetraedge/te/te_camera.h"
#include "tetraedge/te/te_matricies_stack.h"

namespace Tetraedge {

class TeRenderer {
public:
    TeRenderer();
    virtual ~TeRenderer() {};

    enum MatrixMode {
        MM_GL_PROJECTION = 0,
        MM_GL_MODELVIEW = 1,
        MM_GL_TEXTURE = 2
    };

    enum ShadowMode {
        ShadowModeNone = 0,
        ShadowModeCreating = 1,
        ShadowModeDrawing = 2
    };

    class TransparentMeshProperties {
    public:
        TransparentMeshProperties() : _camera(nullptr), _vertexCount(0), _shouldDraw(false),
            _scissorEnabled(false), _hasColor(false), _glTexEnvMode(0), _zOrder(0.0f),
            _sourceTransparentMesh(0), _scissorX(0), _scissorY(0),
            _scissorWidth(0), _scissorHeight(0) {}

        TeCamera *_camera;
        int _vertexCount;
        TeMatrix4x4 _matrix;

        TeMaterial _material;

        uint32 _glTexEnvMode;
        uint _sourceTransparentMesh;
        bool _hasColor;
        float _zOrder;
        bool _scissorEnabled;
        int _scissorX;
        int _scissorY;
        int _scissorWidth;
        int _scissorHeight;
        bool _shouldDraw;
    };

    enum Buffer {
        DepthBuffer = 1,
        ColorBuffer = 2,
        StencilBuffer = 4,
        ColorAndDepth = DepthBuffer | ColorBuffer,
        AllBuffers = DepthBuffer | ColorBuffer | StencilBuffer
    };

    void addTransparentMesh(const TeMesh &mesh, uint i1, uint i2, uint i3);
    void checkError(const Common::String &str) {};
    virtual void clearBuffer(Buffer buf) = 0;
    virtual void colorMask(bool r, bool g, bool b, bool a) = 0;
    void create();
    TeMatrix4x4 currentMatrix();
    virtual void disableAllLights() = 0;
    virtual void disableTexture() = 0;
    virtual void disableWireFrame() = 0;
    virtual void disableZBuffer() = 0;
    virtual void drawLine(const TeVector3f32 &from, const TeVector3f32 &to) = 0;
    virtual void enableAllLights() = 0;
    virtual void enableTexture() = 0;
    virtual void enableWireFrame() = 0;
    virtual void enableZBuffer() = 0;
    //void extractFrameBufferToImg(const TeVector2s32 &from, const TeVector2s32 &to, TeImage &output);
    virtual void init(uint width, uint height) = 0;
    void loadIdentityMatrix();
    void loadMatrix(const TeMatrix4x4 &matrix);
    void loadCurrentMatrixToGL();
    virtual void loadProjectionMatrix(const TeMatrix4x4 &matrix) = 0;
    void multiplyMatrix(const TeMatrix4x4 &matrix);
    void optimiseTransparentMeshProperties();
    void popMatrix();
    void pushMatrix();
    virtual Common::String renderer() = 0;
    virtual void renderTransparentMeshes() = 0;
    virtual void reset() = 0;
    void rotate(const TeQuaternion &rot);
    void rotate(float angle, float rx, float ry, float rz);
    void scale(float xs, float ys, float zs);
    bool scissorEnabled() const { return _scissorEnabled; }
    int scissorHeight() const { return _scissorHeight; }
    int scissorWidth() const { return _scissorWidth; }
    int scissorX() const { return _scissorX; }
    int scissorY() const { return _scissorY; }
    void sendModelMatrix(const TeMatrix4x4 &matrix) {}
    virtual void setClearColor(const TeColor &col) = 0;
    void setCurrentCamera(TeCamera *camera) {
        _currentCamera = camera;
    }
    virtual void setCurrentColor(const TeColor &col) = 0;
    virtual void setMatrixMode(enum MatrixMode mode) = 0;
    void setScissor(int x, int y, int w, int h);
    void setScissorEnabled(bool val) { _scissorEnabled = val; }
    virtual void setViewport(int x, int y, int w, int h) = 0;
    virtual void shadowMode(enum ShadowMode mode) = 0;
    enum ShadowMode shadowMode() const { return _shadowMode; }
    void translate(float x, float y, float z);
    virtual Common::String vendor() = 0;

    void dumpTransparentMeshProps() const;
    void dumpTransparentMeshData() const;
    const TeColor &currentColor() const { return _currentColor; }

    virtual void updateScreen() = 0;
    virtual void updateGlobalLight() = 0;
    virtual void applyMaterial(const TeMaterial &m) = 0;

    static TeRenderer *makeInstance();

protected:
    TeCamera *_currentCamera;
    TeColor _currentColor;
    TeColor _clearColor;
    bool _textureEnabled;

    ShadowMode _shadowMode;
    MatrixMode _matrixMode;

    bool _scissorEnabled;
    int _scissorHeight;
    int _scissorWidth;
    int _scissorX;
    int _scissorY;

    uint _numTransparentMeshes;
    Common::Array<TeVector3f32> _transparentMeshVertexes;
    Common::Array<TeVector3f32> _transparentMeshNormals;
    Common::Array<TeVector2f32> _transparentMeshCoords;
    Common::Array<TeColor> _transparentMeshColors;
    Common::Array<unsigned short> _transparentMeshVertexNums;

    int _pendingTransparentMeshProperties;
    Common::Array<TransparentMeshProperties> _transparentMeshProps;

    TeMatriciesStack _matriciesStacks[3];  // one per matrix mode.

    virtual void loadMatrixToGL(const TeMatrix4x4 &matrix) = 0;
};

} // end namespace Tetraedge

#endif // TETRAEDGE_TE_TE_RENDERER_H