Initial public source release

Split reusable rendering and format support into vectorail-core and vectorail-gc.
2026-08-02 17:05:27 +02:00
commit 831d96e562
109 changed files with 20558 additions and 0 deletions
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+#version 450 core
+out vec4 FragColor;
+in vec2 vUv;
+uniform float uTime;
+uniform vec3 uResolution;
+uniform sampler2D uBackdrop;
+uniform bool uHasBackdrop;
+uniform float uBackdropAspect;
+uniform vec3 uBgTopRight;
+uniform vec3 uBgTopLeft;
+uniform vec3 uBgBottomRight;
+uniform vec3 uBgBottomLeft;
+
+void main() {
+    vec3 top = mix(uBgTopLeft, uBgTopRight, vUv.x);
+    vec3 bottom = mix(uBgBottomLeft, uBgBottomRight, vUv.x);
+    vec3 color = mix(bottom, top, vUv.y);
+
+    if (uHasBackdrop) {
+        // The useful jacket cell occupies the left square of GC's 512x256
+        // *_menu.dds atlas.  Crop that cell and cover the portrait viewport.
+        float screenAspect = uResolution.x / uResolution.y;
+        vec2 imageUv = vUv - 0.5;
+        if (screenAspect < uBackdropAspect) {
+            imageUv.x *= screenAspect / uBackdropAspect;
+        } else {
+            imageUv.y *= uBackdropAspect / screenAspect;
+        }
+        imageUv += 0.5;
+        // Jacket cell bounds are 197x197 in the original 512x256 atlas.
+        vec2 atlasUv = vec2(imageUv.x * (197.0 / 512.0),
+                            (1.0 - imageUv.y) * (197.0 / 256.0));
+        vec4 backdrop = texture(uBackdrop, atlasUv);
+        float vignette = 1.0 - smoothstep(0.18, 0.82, length(vUv - 0.5));
+        color = mix(color, backdrop.rgb * (0.08 + 0.05 * vignette), backdrop.a * 0.45);
+    }
+
+    FragColor = vec4(color, 1.0);
+}