forked from tsuki/openroller
40 lines
1.4 KiB
GLSL
40 lines
1.4 KiB
GLSL
#version 450 core
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out vec4 FragColor;
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in vec2 vUv;
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uniform float uTime;
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uniform vec3 uResolution;
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uniform sampler2D uBackdrop;
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uniform bool uHasBackdrop;
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uniform float uBackdropAspect;
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uniform vec3 uBgTopRight;
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uniform vec3 uBgTopLeft;
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uniform vec3 uBgBottomRight;
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uniform vec3 uBgBottomLeft;
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void main() {
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vec3 top = mix(uBgTopLeft, uBgTopRight, vUv.x);
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vec3 bottom = mix(uBgBottomLeft, uBgBottomRight, vUv.x);
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vec3 color = mix(bottom, top, vUv.y);
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if (uHasBackdrop) {
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// The useful jacket cell occupies the left square of GC's 512x256
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// *_menu.dds atlas. Crop that cell and cover the portrait viewport.
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float screenAspect = uResolution.x / uResolution.y;
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vec2 imageUv = vUv - 0.5;
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if (screenAspect < uBackdropAspect) {
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imageUv.x *= screenAspect / uBackdropAspect;
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} else {
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imageUv.y *= uBackdropAspect / screenAspect;
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}
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imageUv += 0.5;
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// Jacket cell bounds are 197x197 in the original 512x256 atlas.
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vec2 atlasUv = vec2(imageUv.x * (197.0 / 512.0),
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(1.0 - imageUv.y) * (197.0 / 256.0));
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vec4 backdrop = texture(uBackdrop, atlasUv);
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float vignette = 1.0 - smoothstep(0.18, 0.82, length(vUv - 0.5));
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color = mix(color, backdrop.rgb * (0.08 + 0.05 * vignette), backdrop.a * 0.45);
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}
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FragColor = vec4(color, 1.0);
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}
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