lightmapuvraster.vert

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// Copyright (C) 2023 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#version 440

layout(location = 0) in vec3 attr_pos;

layout(location = 1) in vec3 attr_normal;

layout(location = 2) in vec2 attr_lightmap_uv;

#if defined(QSSG_LIGHTMAPUVRASTER_UV) || defined(QSSG_LIGHTMAPUVRASTER_UV_TANGENT)

layout(location = 3) in vec2 attr_uv;

#endif

#if defined(QSSG_LIGHTMAPUVRASTER_UV_TANGENT)

layout(location = 4) in vec3 attr_tangent;

layout(location = 5) in vec3 attr_binormal;

#endif

layout(location = 0) out vec3 v_pos;

layout(location = 1) out vec3 v_normal;

layout(location = 2) out vec2 v_uv;

layout(location = 3) out vec3 v_tangent;

layout(location = 4) out vec3 v_binormal;

layout(std140, binding = 0) uniform buf {

    vec4 baseColorLinear;

    vec3 emissiveFactor;

    int flipY;

    int hasBaseColorMap;

    int hasEmissiveMap;

    int hasNormalMap;

    float bumpAmount;

    float regionMinU;

    float regionMinV;

    float regionMaxU;

    float regionMaxV;

};

void main()

    vec2 regionMin = vec2(regionMinU, regionMinV);

    vec2 regionMax = vec2(regionMaxU, regionMaxV);

    v_pos = attr_pos;

    v_normal = attr_normal;

#if defined(QSSG_LIGHTMAPUVRASTER_UV) || defined(QSSG_LIGHTMAPUVRASTER_UV_TANGENT)

    v_uv = attr_uv;

#else

    v_uv = vec2(0.0);

#endif

#if defined(QSSG_LIGHTMAPUVRASTER_UV_TANGENT)

    v_tangent = attr_tangent;

    v_binormal = attr_binormal;

#else

    v_tangent = vec3(0.0);

    v_binormal = vec3(0.0);

#endif

    // Zoomed UV from lightmap subregion

    vec2 uv = attr_lightmap_uv;

    uv = (uv - regionMin) / (regionMax - regionMin); // Map region to [0, 1]

    // Convert to NDC [-1, 1]

    vec2 uv_ndc = vec2(uv.x * 2.0 - 1.0, uv.y * 2.0 - 1.0);

    if (flipY != 0)

        uv_ndc.y *= -1.0;

    gl_Position = vec4(uv_ndc, 0.0, 1.0);