/* 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 GRIM_GFX_BASE_H
#define GRIM_GFX_BASE_H

#include "math/vector3d.h"
#include "math/quat.h"

#include "common/str.h"
#include "common/rect.h"

#include "graphics/pixelformat.h"
#include "graphics/renderer.h"

#include "engines/grim/material.h"

namespace Graphics {
	struct Surface;
}

namespace Grim {

struct Shadow;
struct Light;
class Actor;
class SaveGame;
class BitmapData;
class Bitmap;
class CMap;
class Color;
class PrimitiveObject;
class Font;
class TextObject;
class EMIModel;
class EMIMeshFace;
class ModelNode;
class Mesh;
class MeshFace;
class Sprite;
class Texture;
class Overlay;

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

	/**
	 * Creates a render-context.
	 *
	 * @param screenW       the width of the context
	 * @param screenH       the height of the context
	 */
	virtual void setupScreen(int screenW, int screenH) = 0;

	/**
	 * Query whether the current context is hardware-accelerated
	 *
	 * @return true if hw-accelerated, false otherwise
	 */
	virtual bool isHardwareAccelerated() = 0;
	/**
	* Query whether the current context supports shaders
	*
	* @return true if supports shaders, false otherwise
	*/
	virtual bool supportsShaders() = 0;

	virtual uint getScreenWidth() { return _screenWidth; }
	virtual uint getScreenHeight() { return _screenHeight; }

	virtual void setupCameraFrustum(float fov, float nclip, float fclip) = 0;
	virtual void positionCamera(const Math::Vector3d &pos, const Math::Vector3d &interest, float roll) = 0;
	virtual void positionCamera(const Math::Vector3d &pos, const Math::Matrix4 &rot) = 0;

	virtual Math::Matrix4 getModelView() = 0;
	virtual Math::Matrix4 getProjection() = 0;

	virtual void clearScreen() = 0;
	virtual void clearDepthBuffer() = 0;

	/**
	 *  Swap the buffers, making the drawn screen visible
	 *
	 *  @param opportunistic True when the flip can be avoided to spare CPU
	 */
	virtual void flipBuffer(bool opportunistic = false) = 0;

	/**
	 * FIXME: The implementations of these functions (for Grim and EMI, respectively)
	 * are very similar. Needs refactoring. See issue #789.
	 */
	virtual void getScreenBoundingBox(const Mesh *mesh, int *x1, int *y1, int *x2, int *y2) = 0;
	virtual void getScreenBoundingBox(const EMIModel *mesh, int *x1, int *y1, int *x2, int *y2) = 0;
	virtual void getActorScreenBBox(const Actor *actor, Common::Point &p1, Common::Point &p2) = 0;
	virtual void startActorDraw(const Actor *act) = 0;
	virtual void finishActorDraw() = 0;
	virtual void setShadow(Shadow *shadow) = 0;
	virtual void drawShadowPlanes() = 0;
	virtual void setShadowMode();
	virtual void clearShadowMode();
	virtual bool isShadowModeActive();
	virtual void setShadowColor(byte r, byte g, byte b) = 0;
	virtual void getShadowColor(byte *r, byte *g, byte *b) = 0;
	virtual void destroyShadow(Shadow *shadow) {}

	virtual void set3DMode() = 0;

	virtual void translateViewpointStart() = 0;
	virtual void translateViewpoint(const Math::Vector3d &vec) = 0;
	virtual void rotateViewpoint(const Math::Angle &angle, const Math::Vector3d &axis) = 0;
	virtual void rotateViewpoint(const Math::Matrix4 &rot) = 0;
	virtual void translateViewpointFinish() = 0;

	virtual void drawEMIModelFace(const EMIModel *model, const EMIMeshFace *face) = 0;
	virtual void drawModelFace(const Mesh *mesh, const MeshFace *face) = 0;
	virtual void drawSprite(const Sprite *sprite) = 0;
	virtual void drawMesh(const Mesh *mesh);

	virtual void drawOverlay(const Overlay *overlay) { };

	virtual void enableLights() = 0;
	virtual void disableLights() = 0;
	virtual void setupLight(Light *light, int lightId) = 0;
	virtual void turnOffLight(int lightId) = 0;

	virtual void createTexture(Texture *texture, const uint8 *data, const CMap *cmap, bool clamp) = 0;
	virtual void selectTexture(const Texture *texture) = 0;
	virtual void destroyTexture(Texture *texture) = 0;

	/**
	 * Prepares a bitmap for drawing
	 * performs any format conversions needed for the renderer,
	 * and might create an internal representation of the bitmap
	 * external changes to the bitmap may not be visible after this
	 * is called. Must be called before drawBitmap can be used.
	 *
	 * the external bitmap might have its data changed by this function,
	 *
	 * @param bitmap    the bitmap to be prepared
	 * @see destroyBitmap
	 * @see drawBitmap
	 */
	virtual void createBitmap(BitmapData *bitmap) = 0;

	/**
	 * Draws a bitmap
	 * before this is safe to use, createBitmap MUST have been called
	 *
	 * @param bitmap    the bitmap to be drawn
	 * @see createBitmap
	 * @see destroyBitmap
	 */
	virtual void drawBitmap(const Bitmap *bitmap, int x, int y, uint32 layer = 0) = 0;

	/**
	 * Deletes any internal references and representations of a bitmap
	 * after this is called, it is safe to dispose of or change the external
	 * bitmapdata.
	 *
	 * @param bitmap    the bitmap to be destroyed
	 * @see createBitmap
	 * @see drawBitmap
	 */
	virtual void destroyBitmap(BitmapData *bitmap) = 0;

	virtual void createFont(Font *font) = 0;
	virtual void destroyFont(Font *font) = 0;

	virtual void createTextObject(TextObject *text) = 0;
	virtual void drawTextObject(const TextObject *text) = 0;
	virtual void destroyTextObject(TextObject *text) = 0;

	virtual Bitmap *getScreenshot(int w, int h, bool useStored) = 0;
	virtual void storeDisplay() = 0;
	virtual void copyStoredToDisplay() = 0;

	/**
	 * Dims the entire screen
	 * Sets the entire screen to 10% of its current brightness,
	 * and converts it to grayscale.
	 */
	virtual void dimScreen() = 0;
	virtual void dimRegion(int x, int y, int w, int h, float level) = 0;
	virtual void setDimLevel(float dimLevel) { _dimLevel = dimLevel; }

	/**
	 * Draw a completely opaque Iris around the specified rectangle.
	 * the arguments specify the distance from the screen-edge to the first
	 * non-iris pixel.
	 *
	 * @param x     the width of the Iris
	 * @param y     the height of the Iris
	 */
	virtual void irisAroundRegion(int x1, int y1, int x2, int y2) = 0;

	virtual void drawEmergString(int x, int y, const char *text, const Color &fgColor) = 0;
	virtual void loadEmergFont() = 0;

	virtual void drawRectangle(const PrimitiveObject *primitive) = 0;
	virtual void drawLine(const PrimitiveObject *primitive) = 0;
	virtual void drawPolygon(const PrimitiveObject *primitive) = 0;
	virtual void drawDimPlane() {};

	virtual const Graphics::PixelFormat getMovieFormat() const = 0;

	/**
	 * Prepare a movie-frame for drawing
	 * performing any necessary conversion
	 *
	 * @param width         the width of the movie-frame.
	 * @param height        the height of the movie-frame.
	 * @param bitmap        a pointer to the data for the movie-frame.
	 * @see drawMovieFrame
	 * @see releaseMovieFrame
	 */
	virtual void prepareMovieFrame(Graphics::Surface *frame) = 0;
	virtual void prepareMovieFrame(Graphics::Surface *frame, const byte *palette);
	virtual void drawMovieFrame(int offsetX, int offsetY) = 0;

	/**
	 * Release the currently prepared movie-frame, if one exists.
	 *
	 * @see drawMovieFrame
	 * @see prepareMovieFrame
	 */
	virtual void releaseMovieFrame() = 0;

	virtual const char *getVideoDeviceName() = 0;

	virtual void saveState(SaveGame *state);
	virtual void restoreState(SaveGame *state);

	virtual void renderBitmaps(bool render);
	virtual void renderZBitmaps(bool render);

	virtual void makeScreenTextures();

	virtual void createMesh(Mesh *mesh) {}
	virtual void destroyMesh(const Mesh *mesh) {}
	virtual void createEMIModel(EMIModel *model) {}
	virtual void updateEMIModel(const EMIModel *model) {}
	virtual void destroyEMIModel(EMIModel *model) {}

	virtual void createSpecialtyTexture(uint id, const uint8 *data, int width, int height);
	virtual void createSpecialtyTextureFromScreen(uint id, uint8 *data, int x, int y, int width, int height) = 0;

	Graphics::RendererType type;

	static Math::Matrix4 makeLookMatrix(const Math::Vector3d& pos, const Math::Vector3d& interest, const Math::Vector3d& up);
	static Math::Matrix4 makeProjMatrix(float fov, float nclip, float fclip);
	Texture *getSpecialtyTexturePtr(uint id) { if (id >= _numSpecialtyTextures) return nullptr; return &_specialtyTextures[id]; };
	Texture *getSpecialtyTexturePtr(Common::String name);

	virtual void setBlendMode(bool additive) = 0;
protected:
	Bitmap *createScreenshotBitmap(Graphics::Surface *src, int w, int h, bool flipOrientation);
	static const unsigned int _numSpecialtyTextures = 22;
	Texture _specialtyTextures[_numSpecialtyTextures];
	static const int _gameHeight = 480;
	static const int _gameWidth = 640;
	static const int _globalHeight = 1080;
	static const int _globalWidth = 1920;
	float _scaleW, _scaleH;
	float _globalScaleW = 1.0f, _globalScaleH = 1.0f;
	int _screenWidth, _screenHeight;
	Shadow *_currentShadowArray;
	unsigned char _shadowColorR;
	unsigned char _shadowColorG;
	unsigned char _shadowColorB;
	bool _renderBitmaps;
	bool _renderZBitmaps;
	bool _shadowModeActive;
	Math::Vector3d _currentPos;
	Math::Matrix4 _currentRot;
	float _dimLevel;
};

// Factory-like functions:

GfxBase *CreateGfxOpenGL();
GfxBase *CreateGfxOpenGLShader();
GfxBase *CreateGfxTinyGL();

extern GfxBase *g_driver;

} // end of namespace Grim

#endif