types.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 BACKENDS_GRAPHICS_OPENGL_PIPELINES_LIBRETRO_TYPES_H
#define BACKENDS_GRAPHICS_OPENGL_PIPELINES_LIBRETRO_TYPES_H

#include "graphics/opengl/system_headers.h"
#include "backends/graphics/opengl/texture.h"

#if !USE_FORCED_GLES
#include "common/str.h"
#include "common/array.h"
#include "common/fs.h"

namespace OpenGL {
namespace LibRetro {

typedef Common::HashMap<Common::String, float, Common::CaseSensitiveString_Hash, Common::CaseSensitiveString_EqualTo> UniformsMap;

enum FilteringMode {
    kFilteringModeUnspecified,
    kFilteringModeNearest,
    kFilteringModeLinear
};

struct ShaderTexture {
    ShaderTexture() : id(), fileName(), filteringMode(kFilteringModeUnspecified) {}
    ShaderTexture(const Common::String &i, const Common::String &fN, FilteringMode fM, WrapMode wM)
        : id(i), fileName(fN), filteringMode(fM), wrapMode(wM) {}

    Common::String id;
    Common::String fileName;
    FilteringMode filteringMode;
    WrapMode wrapMode;
};

enum ScaleType {
    kScaleTypeSource,
    kScaleTypeViewport,
    kScaleTypeAbsolute,
    kScaleTypeFull
};

inline void applyScale(const ScaleType type,
                       const float source, const float viewport,
                       const float scaleFloat, const uint scaleUint,
                       float *output) {
    switch (type) {
    case kScaleTypeSource:
        *output = source * scaleFloat;
        break;

    case kScaleTypeViewport:
        *output = viewport * scaleFloat;
        break;

    case kScaleTypeAbsolute:
        *output = scaleUint;
        break;

    case kScaleTypeFull:
        *output = viewport;
        break;
    }
}

struct ShaderPass {
    Common::String fileName;
    Common::String alias;

    FilteringMode filteringMode;
    WrapMode wrapMode;
    bool mipmapInput;

    bool floatFBO;
    bool srgbFBO;

    uint frameCountMod;

    ScaleType scaleTypeX;
    ScaleType scaleTypeY;

    float scaleXFloat;
    float scaleYFloat;

    uint scaleXUint;
    uint scaleYUint;

    void applyScale(const float sourceW, const float sourceH,
                    const float viewportW, const float viewportH,
                    float *outputW, float *outputH) const {
        OpenGL::LibRetro::applyScale(scaleTypeX, sourceW, viewportW, scaleXFloat, scaleXUint, outputW);
        OpenGL::LibRetro::applyScale(scaleTypeY, sourceH, viewportH, scaleYFloat, scaleYUint, outputH);
    }
};

struct ShaderPreset {
    Common::Archive *container;
    Common::Path basePath;

    typedef Common::Array<ShaderTexture> TextureArray;
    TextureArray textures;

    typedef Common::Array<ShaderPass> PassArray;
    PassArray passes;

    UniformsMap parameters;
};

} // End of namespace LibRetro
} // End of namespace OpenGL
#endif // !USE_FORCED_GLES

#endif