A fragment shader for stereo image/video rendering in wonderland engine

FlatStereo.frag

/**
    Copyright © 2024 Nithin Steven F <[email protected]>
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:
    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
*/

#include "lib/Compatibility.frag"

#define FEATURE_TEXTURED
#define FEATURE_ALPHA_MASKED
#define FEATURE_VERTEX_COLORS

#ifdef TEXTURED
#define USE_TEXTURE_COORDS
#endif
#ifdef VERTEX_COLORS
#define USE_COLOR
#endif

#define USE_MATERIAL_ID
#include "lib/Uniforms.glsl"
#include "lib/Inputs.frag"

#ifdef TEXTURED
#include "lib/Textures.frag"
#endif
#include "lib/Packing.frag"
#include "lib/Materials.frag"

struct Material {
    lowp vec4 color;
    mediump uint flatTextureLeft;
    mediump uint flatTextureRight;

};

Material decodeMaterial(uint matIndex) {
    {{decoder}}
    return mat;
}

void main() {
#ifdef TEXTURED
    alphaMask(fragMaterialId, fragTextureCoords);
#endif

    Material mat = decodeMaterial(fragMaterialId);

    // Select texture based on view index (left or right eye)
    mediump uint selectedTexture = (int(viewIndex) == 0) ? mat.flatTextureLeft : mat.flatTextureRight;

    outColor =
        #ifdef VERTEX_COLORS
        fragColor *
        #endif
        #ifdef TEXTURED
        textureAtlas(selectedTexture, fragTextureCoords) *
        #endif
        mat.color;
}