gfx.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 FREESCAPE_GFX_H
#define FREESCAPE_GFX_H

#include "common/hashmap.h"
#include "common/rendermode.h"
#include "common/rect.h"

#include "graphics/pixelformat.h"
#include "graphics/managed_surface.h"
#include "graphics/renderer.h"
#include "math/frustum.h"
#include "math/vector3d.h"

namespace Freescape {

#define kVertexArraySize 128
#define kCoordsArraySize 4

typedef Common::Array<byte *> ColorMap;
typedef Common::HashMap<int, int> ColorReMap;

class Renderer;

const Graphics::PixelFormat getRGBAPixelFormat();
byte getCPCPixelMode1(byte cpc_byte, int index);
byte getCPCPixelMode0(byte cpc_byte, int index);
byte getCPCPixel(byte cpc_byte, int index, bool mode1);

class Texture {
public:
    Texture(){ _width = 0; _height = 0; };
    virtual ~Texture(){};

    uint _width;
    uint _height;
    Graphics::PixelFormat _format;

    virtual void update(const Graphics::Surface *surface) = 0;
    virtual void updatePartial(const Graphics::Surface *surface, const Common::Rect &rect) = 0;
};

class Renderer {
public:
    Renderer(int screenW, int screenH, Common::RenderMode renderMode, bool authenticGraphics);
    virtual ~Renderer();

    Graphics::PixelFormat _texturePixelFormat;
    bool _isAccelerated;
    bool _authenticGraphics;

    virtual void init() = 0;
    virtual void setViewport(const Common::Rect &rect) = 0;

    virtual void flipBuffer() {}

    enum StereoEye {
        kStereoEyeNone = 0,
        kStereoEyeLeft = -1,
        kStereoEyeRight = 1,
        kStereoEyeFlatAnaglyph = 2
    };
    virtual void setStereoEye(StereoEye eye) { _stereoEye = eye; }
    void setStereoParameters(float separation, float convergence);

    virtual void useColor(uint8 r, uint8 g, uint8 b) = 0;
    virtual void enableCulling(bool enabled) {};
    virtual void polygonOffset(bool enabled) = 0;

    virtual Texture *createTexture(const Graphics::Surface *surface, bool is3D = false) = 0;
    Graphics::Surface *convertImageFormatIfNecessary(Graphics::ManagedSurface *surface);

    virtual void freeTexture(Texture *texture) = 0;
    virtual void drawTexturedRect2D(const Common::Rect &screenRect, const Common::Rect &textureRect, Texture *texture) = 0;

    virtual void renderSensorShoot(byte color, const Math::Vector3d sensor, const Math::Vector3d player, const Common::Rect &viewPort) = 0;
    virtual void renderPlayerShootBall(byte color, const Common::Point &position, int frame, const Common::Rect &viewPort) = 0;
    virtual void renderPlayerShootRay(byte color, const Common::Point &position, const Common::Rect &viewPort) = 0;

    virtual void renderCrossair(const Common::Point &crossairPosition) = 0;

    virtual void renderCube(const Math::Vector3d &position, const Math::Vector3d &size, Common::Array<uint8> *colours, Common::Array<uint8> *ecolours, float offset = 0.0);
    virtual void renderRectangle(const Math::Vector3d &position, const Math::Vector3d &size, Common::Array<uint8> *colours, Common::Array<uint8> *ecolours, float offset = 0.0);
    virtual void renderPolygon(const Math::Vector3d &origin, const Math::Vector3d &size, const Common::Array<float> *ordinates, Common::Array<uint8> *colours, Common::Array<uint8> *ecolours, float offset = 0.0);
    virtual void renderPyramid(const Math::Vector3d &origin, const Math::Vector3d &size, const Common::Array<float> *ordinates, Common::Array<uint8> *colours, Common::Array<uint8> *ecolours, int type);
    virtual void renderFace(const Common::Array<Math::Vector3d> &vertices) = 0;

    void setColorRemaps(ColorReMap *colorRemaps);
    virtual void clear(uint8 r, uint8 g, uint8 b, bool ignoreViewport = false) = 0;
    virtual void clearDepthBuffer(bool ignoreViewport = false) {}
    virtual void drawFloor(uint8 color) = 0;
    virtual void drawBackground(uint8 color);

    void drawEclipse(uint8 color1, uint8 color2, float difference);
    virtual void drawSkybox(Texture *texture, Math::Vector3d camera) {};
    virtual void drawThunder(Texture *texture, Math::Vector3d camera, float size) {};
    virtual void drawCelestialBody(Math::Vector3d position, float radius, uint8 color) {};

    Common::Rect viewport() const;
    virtual Common::Point nativeResolution() { return Common::Point(_screenW, _screenH); }

    // palette
    void readFromPalette(uint8 index, uint8 &r, uint8 &g, uint8 &b);
    void setPaletteValue(uint8 index, uint8 r, uint8 g, uint8 b);
    uint8 indexFromColor(uint8 r, uint8 g, uint8 b);
    uint8 mapEGAColor(uint8 index);

    bool getRGBAt(uint8 index, uint8 ecolor, uint8 &r1, uint8 &g1, uint8 &b1, uint8 &r2, uint8 &g2, uint8 &b2, byte *&stipple);
    bool getRGBAtC64(uint8 index, uint8 &r1, uint8 &g1, uint8 &b1, uint8 &r2, uint8 &g2, uint8 &b2, byte *&stipple);
    bool getRGBAtCGA(uint8 index, uint8 &r1, uint8 &g1, uint8 &b1, uint8 &r2, uint8 &g2, uint8 &b2, byte *&stipple);
    bool getRGBAtCPC(uint8 index, uint8 &r1, uint8 &g1, uint8 &b1, uint8 &r2, uint8 &g2, uint8 &b2, byte *&stipple);
    bool getRGBAtEGA(uint8 index, uint8 &r1, uint8 &g1, uint8 &b1, uint8 &r2, uint8 &g2, uint8 &b2);
    bool getRGBAtZX(uint8 index, uint8 &r1, uint8 &g1, uint8 &b1, uint8 &r2, uint8 &g2, uint8 &b2, byte *&stipple);
    bool getRGBAtHercules(uint8 index, uint8 &r1, uint8 &g1, uint8 &b1, uint8 &r2, uint8 &g2, uint8 &b2, byte *&stipple);
    void extractCPCIndexes(uint8 cm1, uint8 cm2, uint8 &i1, uint8 &i2);
    void extractC64Indexes(uint8 cm1, uint8 cm2, uint8 &i1, uint8 &i2);

    void selectColorFromFourColorPalette(uint8 index, uint8 &r1, uint8 &g1, uint8 &b1);

    // Stipple
    virtual void setStippleData(byte *data) {};
    virtual void useStipple(bool enabled) {};
    void scaleStipplePattern(byte originalPattern[128], byte newPattern[128]);

    byte _defaultStippleArray[128] = {
        0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
        0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
        0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
        0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
        0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
        0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
        0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
        0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
        0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
        0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
        0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
        0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
        0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
        0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
        0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC,
        0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
    };

    byte *_variableStippleArray;

    float _skyNormals[16][3] = {
        { 0.0, 0.0, 1.0 }, //front //0
        { 0.0, 0.0, 1.0 },      //1
        { 0.0, 0.0, 1.0 },      //2
        { 0.0, 0.0, 1.0 },      //3
        { 0.0, 0.0, -1.0 }, //back //0
        { 0.0, 0.0, -1.0 },     //1
        { 0.0, 0.0, -1.0 },     //2
        { 0.0, 0.0, -1.0 },     //3
        { -1.0, 0.0, 0.0 }, //left
        { -1.0, 0.0, 0.0 },
        { -1.0, 0.0, 0.0 },
        { -1.0, 0.0, 0.0 },
        { 1.0, 0.0, 0.0 }, //right
        { 1.0, 0.0, 0.0 },
        { 1.0, 0.0, 0.0 },
        { 1.0, 0.0, 0.0 }
    };

    float _skyUvs1008[16][2] = {
        { 0.0f, 0.0f }, //1
        { 0.0f, 2.0f }, //2
        { 0.4f, 2.0f }, //3
        { 0.4f, 0.0f }, //front //4

        { 0.0f, 2.0f }, //back //1
        { 0.4f, 2.0f }, //2
        { 0.4f, 0.0f }, //3
        { 0.0f, 0.0f }, //4

        { 0.0f, 0.0f }, //left //1
        { 0.4f, 0.0f }, //2
        { 0.4f, 2.0f }, //3
        { 0.0f, 2.0f }, //4

        { 0.4f, 0.0f }, //right //1
        { 0.0f, 0.0f }, //2
        { 0.0f, 2.0f }, //3
        { 0.4f, 2.0f }, //4
    };

    float _skyUvs672[16][2] = {
        { 0.0f, 0.0f }, //1
        { 0.0f, 2.0f }, //2
        { 0.6f, 2.0f }, //3
        { 0.6f, 0.0f }, //front //4

        { 0.0f, 2.0f }, //back //1
        { 0.6f, 2.0f }, //2
        { 0.6f, 0.0f }, //3
        { 0.0f, 0.0f }, //4

        { 0.0f, 0.0f }, //left //1
        { 0.6f, 0.0f }, //2
        { 0.6f, 2.0f }, //3
        { 0.0f, 2.0f }, //4

        { 0.6f, 0.0f }, //right //1
        { 0.0f, 0.0f }, //2
        { 0.0f, 2.0f }, //3
        { 0.6f, 2.0f }, //4
    };

    float _skyUvs128[16][2] = {
        { 0.0f, 0.0f }, //1
        { 0.0f, 2.0f }, //2
        { 2.5f, 2.0f }, //3
        { 2.5f, 0.0f }, //front //4

        { 0.0f, 2.0f }, //back //1
        { 2.5f, 2.0f }, //2
        { 2.5f, 0.0f }, //3
        { 0.0f, 0.0f }, //4

        { 0.0f, 0.0f }, //left //1
        { 2.5f, 0.0f }, //2
        { 2.5f, 2.0f }, //3
        { 0.0f, 2.0f }, //4

        { 2.5f, 0.0f }, //right //1
        { 0.0f, 0.0f }, //2
        { 0.0f, 2.0f }, //3
        { 2.5f, 2.0f }, //4
    };

    float _skyVertices[16][3] = {
        { -81280.0, 8128.0, 81280.0 },          //1     // Vertex #0 front
        { -81280.0, -8128.0, 81280.0 }, //2     // Vertex #1
        { 81280.0,  -8128.0, 81280.0 }, //3     // Vertex #2
        { 81280.0,  8128.0, 81280.0 },          //4     // Vertex #3

        { 81280.0f, -8128.0f, -81280.0f }, // 1
        { -81280.0f, -8128.0f, -81280.0f }, // 2
        { -81280.0f, 8128.0f, -81280.0f }, // 3
        { 81280.0f, 8128.0f, -81280.0f }, // 4

        { -81280.0f,  8128.0f,  81280.0f }, //left //1
        { -81280.0f,  8128.0f, -81280.0f }, //2
        { -81280.0f, -8128.0f, -81280.0f }, //3
        { -81280.0f, -8128.0f,  81280.0f }, //4

        { 81280.0f,  8128.0f, -81280.0f }, //right //1
        { 81280.0f,  8128.0f,  81280.0f }, //2
        { 81280.0f, -8128.0f,  81280.0f },//3
        { 81280.0f, -8128.0f, -81280.0f },//4
    };

    unsigned int _skyIndices[24] = {
        0, 1, 2,    // front
        0, 2, 3,

        4, 5, 6,    // back
        4, 6, 7,

        8, 9, 10,   // left
        8, 10, 11,

        12, 13, 14, // right
        12, 14, 15,
    };

    byte *_palette;
    void setColorMap(ColorMap *colorMap_);
    ColorMap *_colorMap;
    ColorReMap *_colorRemaps;
    void clearColorPairArray();
    void fillColorPairArray();
    byte _colorPair[16];
    int _keyColor;
    int _inkColor;
    int _paperColor;
    int _underFireBackgroundColor;
    Common::Point _shakeOffset;
    byte _stipples[16][128];

    // Amiga/Atari hardware palette cycling for pulsating surfaces.
    // Castle Master: COLOR15, every 4 frames, per-area gated.
    // Dark Side: COLOR5, every 2 frames, always active.
    Common::Array<uint16> _colorCyclingTable;
    int _colorCyclingIndex;
    int _colorCyclingTimer;     // -1 = disabled, >=0 = active
    int _colorCyclingPaletteIndex; // which palette entry to cycle (5 or 15)
    int _colorCyclingSpeed;     // frames between changes (2 or 4)
    void updateColorCycling();

    int _scale;

    // debug flags
    bool _debugRenderBoundingBoxes;
    bool _debugRenderOcclusionBoxes;
    bool _debugRenderWireframe;
    bool _debugRenderNormals;
    Common::Array<uint8> _debugHighlightObjectIDs;

    // for drawing bounding boxes
    virtual void drawAABB(const Math::AABB &aabb, uint8 r, uint8 g, uint8 b) {}

    virtual void positionCamera(const Math::Vector3d &pos, const Math::Vector3d &interest, float rollAngle = 0.0f) = 0;
    virtual void updateProjectionMatrix(float fov, float aspectRatio, float nearClipPlane, float farClipPlane) = 0;

    Math::Matrix4 getMvpMatrix() const { return _mvpMatrix; }
    virtual Graphics::Surface *getScreenshot() = 0;
    void flipVertical(Graphics::Surface *s);

    int _screenW;
    int _screenH;
    Common::RenderMode _renderMode;

    bool computeScreenViewport();

protected:
    Common::Rect _screenViewport;
    Common::Rect _viewport;
    Common::Rect _unscaledViewport;

    Math::Matrix4 _projectionMatrix;
    Math::Matrix4 _modelViewMatrix;
    Math::Matrix4 _mvpMatrix;

    Math::Frustum _frustum;

    Math::Matrix4 makeProjectionMatrix(float fov, float nearClipPlane, float farClipPlane) const;
    void applyStereoTint(uint8 &r, uint8 &g, uint8 &b) const;
    void getStereoCamera(const Math::Vector3d &pos, const Math::Vector3d &interest, Math::Vector3d &eyePos, Math::Vector3d &eyeInterest) const;
    float getStereoFrustumOffset(float nearClipPlane, bool mirroredProjection) const;

    StereoEye _stereoEye;
    float _stereoSeparation; // half of the inter-ocular distance, in world units
    float _stereoConvergence; // distance to the zero-parallax plane, in world units
};

Graphics::RendererType determinateRenderType();
Renderer *CreateGfxOpenGL(int screenW, int screenH, Common::RenderMode renderMode, bool authenticGraphics);
Renderer *CreateGfxOpenGLShader(int screenW, int screenH, Common::RenderMode renderMode, bool authenticGraphics);
Renderer *CreateGfxTinyGL(int screenW, int screenH, Common::RenderMode renderMode);
Renderer *createRenderer(int screenW, int screenH, Common::RenderMode renderMode, bool authenticGraphics);

} // End of namespace Freescape

#endif // FREESCAPE_GFX_H