opengl_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 WATCHMAKER_OPENGL_RENDERER_H
#define WATCHMAKER_OPENGL_RENDERER_H


#include "watchmaker/3d/math/Matrix4x4.h"
#include "watchmaker/utils.h"
#include "watchmaker/render.h"
#include "watchmaker/3d/render/opengl_3d.h"

namespace Watchmaker {

enum class TransformMatrix {
    PROJECTION,
    VIEW
};

enum class RenderState {
    LIGHT,
    CLIP,
    EXTENT,
    ALPHABLEND,
    ALPHAREF, // TODO
    ZENABLE, // TODO
    ZWRITE_ENABLE, // TODO
    TEXTUREFACTOR // TODO
};

enum class BlendFactor {
    ONE,
    ZERO,
    SRCALPHA,
    INVSRCALPHA,
    INVSRCCOLOR,
    SRCCOLOR,
    DESTCOLOR,
    INVDESTCOLOR
};

enum class TextureWrapMode {
    WRAP,
    CLAMP
};

enum class PrimitiveType {
    LINE,
    TRIANGLE
};

Common::SharedPtr<TextureData> createTextureFromSurface(Graphics::Surface &surface, int texFormat);
Texture *createGLTexture();

class OpenGLRenderer {
public:
    void enter2Dmode();
    void exit2Dmode();

    void pushModelView();
    void popModelView();
    void setTransformMatrix(TransformMatrix which, const Matrix4x4 &matrix);
    // TODO: This should be split.
    void setRenderState(RenderState state, int value);
    void setBlendFunc(BlendFactor src, BlendFactor dst);
    bool error() const {
        //warning("TODO: Implement error");
        return false;
    }
    Common::String getErrorString() {
        warning("TODO: Implement getErrorString");
        return "";
    }
    // TODO: This just maps to the D3D way to setting textures
    void setTexture(int stage, void *texture);
    void setTexture(int stage, const gTexture &texture);
    void setTextureWrapMode(int index, TextureWrapMode mode);

    void drawPrimitives(PrimitiveType primitiveType, Vertex *vertices, int numPrimitives);
    void drawIndexedPrimitivesVBO(PrimitiveType primitiveType, int VBO, int firstVertex, int numVertices, uint16 *faces, uint32 numFaces);
    void drawIndexedPrimitivesVBO(PrimitiveType primitiveType, Common::SharedPtr<VertexBuffer> VBO, int firstVertex, int numVertices, Common::Array<uint16> faces, uint32 numFaces);
    void drawIndexedPrimitivesVBO(PrimitiveType primitiveType, gBatchBlock &bb);
    bool supportsMultiTexturing() const { // TODO
        return false;
    }
};

extern OpenGLRenderer *g_renderer;

} // End of namespace Watchmaker

#endif // WATCHMAKER_OPENGL_RENDERER_H