Archive commit

src/ts/graphics/shaders/palette-layers.glsl

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+// VERTEX
+
+attribute vec2 position;
+attribute vec4 texcoords;
+attribute vec4 vertexColor;
+attribute vec4 vertexColor1;
+
+uniform mat4 transform;
+uniform vec4 lighting;
+
+varying vec4 textureCoord;
+varying vec4 vColor;
+varying vec4 vColor1;
+
+void main() {
+	textureCoord = texcoords;
+	// float f = texcoords.z;
+	// float fr = fract(texcoords.z);
+	// textureCoord.z = fr;
+	// textureCoord.w = (f - fr) / 1024.0;
+	vColor = vertexColor * lighting;
+	vColor1 = vertexColor1;
+	gl_Position = transform * vec4(position, 0, 1);
+}
+
+// FRAGMENT
+
+precision mediump float;
+
+uniform sampler2D sampler1; // sprite
+uniform sampler2D sampler2; // palette
+uniform float pixelSize;
+uniform float textureSize;
+
+varying vec4 textureCoord;
+varying vec4 vColor;
+varying vec4 vColor1;
+
+void main() {
+	vec4 sprite = texture2D(sampler1, textureCoord.xy / textureSize);
+
+	float shade = clamp(sprite.g + vColor1.a, 0.0, 1.0);
+
+	vec4 mask = vec4(vColor1.rgb, 1.0 - (vColor1.r + vColor1.g + vColor1.b));
+	float paletteIndex = dot(mask, sprite);
+
+	vec2 paletteCoord = textureCoord.zw;
+	vec4 palette = texture2D(sampler2, vec2(paletteCoord.x + paletteIndex * pixelSize, paletteCoord.y));
+
+	gl_FragColor = vec4(palette.xyz * shade, palette.w) * vColor;
+}