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data/batcher.glsl

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+@ctype vec2 vec2
+@ctype vec4 vec4
+
+@vs vs
+layout(binding=0) uniform render_data {
+    vec2 one_over_window_size;
+    float zoom;
+};
+
+in vec4 quad;
+in vec4 tex_quad;
+in vec4 colour;
+
+out vec2 uv;
+out vec4 fs_colour;
+
+const int indices[6] = {
+    0, 1, 2, 2, 3, 0,
+};
+
+const vec3 positions[4] = {
+    vec3(0, 0, 0),
+    vec3(0, 1, 0),
+    vec3(1, 1, 0),
+    vec3(1, 0, 0),
+};
+
+const vec2 uvs[4] = {
+    vec2(0.0f, 0.0f), 
+    vec2(0.0f, 1.0f),
+    vec2(1.0f, 1.0f), 
+    vec2(1.0f, 0.0f), 
+};
+
+void main() {
+    int vtx = indices[gl_VertexIndex];
+    vec3 pos = positions[vtx];
+    uv = uvs[vtx];
+
+    pos.xy = ((pos.xy * quad.zw) + quad.xy) * zoom;
+    pos.xy = (pos.xy * one_over_window_size) * 2.0 - 1.0;
+    pos.y = -pos.y;
+
+    uv *= tex_quad.zw;
+    uv += tex_quad.xy;
+
+    gl_Position = vec4(pos, 1);
+    fs_colour = colour;
+}
+@end
+
+@fs fs
+layout(binding=0) uniform texture2D tex;
+layout(binding=0) uniform sampler smp;
+in vec2 uv;
+in vec4 fs_colour;
+
+out vec4 frag_colour;
+
+void main() {
+    vec4 c = texture(sampler2D(tex, smp), uv) * fs_colour;
+    if (c.a < 1) discard;
+    frag_colour = c;
+}
+@end
+
+@program batcher vs fs