@babylonjs/core/Engines/WebGL/webGL2ShaderProcessors.js

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const VaryingRegex = /(flat\s)?\s*varying\s*.*/;
/** @internal */
export class WebGL2ShaderProcessor {
    constructor() {
        this.shaderLanguage = 0 /* ShaderLanguage.GLSL */;
    }
    attributeProcessor(attribute) {
        return attribute.replace("attribute", "in");
    }
    varyingCheck(varying, _isFragment) {
        return VaryingRegex.test(varying);
    }
    varyingProcessor(varying, isFragment) {
        return varying.replace("varying", isFragment ? "in" : "out");
    }
    postProcessor(code, defines, isFragment) {
        const hasDrawBuffersExtension = code.search(/#extension.+GL_EXT_draw_buffers.+require/) !== -1;
        // Remove extensions
        const regex = /#extension.+(GL_OVR_multiview2|GL_OES_standard_derivatives|GL_EXT_shader_texture_lod|GL_EXT_frag_depth|GL_EXT_draw_buffers).+(enable|require)/g;
        code = code.replace(regex, "");
        // Replace instructions
        code = code.replace(/texture2D\s*\(/g, "texture(");
        if (isFragment) {
            const hasOutput = code.search(/layout *\(location *= *0\) *out/g) !== -1;
            const hasDualSourceBlending = defines.indexOf("#define DUAL_SOURCE_BLENDING") !== -1;
            const outputDeclaration = hasDualSourceBlending
                ? "layout(location = 0, index = 0) out vec4 glFragColor;\nlayout(location = 0, index = 1) out vec4 glFragColor2;\n"
                : "layout(location = 0) out vec4 glFragColor;\n";
            if (hasDualSourceBlending) {
                code = "#extension GL_EXT_blend_func_extended : require\n" + code;
            }
            code = code.replace(/texture2DLodEXT\s*\(/g, "textureLod(");
            code = code.replace(/textureCubeLodEXT\s*\(/g, "textureLod(");
            code = code.replace(/textureCube\s*\(/g, "texture(");
            code = code.replace(/gl_FragDepthEXT/g, "gl_FragDepth");
            code = code.replace(/gl_FragColor/g, "glFragColor");
            code = code.replace(/gl_FragData/g, "glFragData");
            code = code.replace(/void\s+?main\s*\(/g, (hasDrawBuffersExtension || hasOutput ? "" : outputDeclaration) + "void main(");
        }
        else {
            const hasMultiviewExtension = defines.indexOf("#define MULTIVIEW") !== -1;
            if (hasMultiviewExtension) {
                return "#extension GL_OVR_multiview2 : require\nlayout (num_views = 2) in;\n" + code;
            }
        }
        return code;
    }
}
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