1 files changed, 28 insertions, 0 deletions
diff --git a/gfx/gl/shaders/billboard.frag b/gfx/gl/shaders/billboard.frag
new file mode 100644
index 0000000..1e2c4ae
--- /dev/null
+++ b/gfx/gl/shaders/billboard.frag
@@ -0,0 +1,28 @@
+#version 460 core
+
+const float tau = 6.28318531;
+
+layout(binding = 0) uniform sampler2DArray billboardDepth;
+layout(binding = 1) uniform sampler2DArray billboardNormal;
+layout(binding = 2) uniform sampler2DArray billboardAlbedo;
+uniform mat4 viewProjection;
+uniform float size;
+
+include(`materialOut.glsl')
+
+flat in ivec3 ModelPos;
+flat in float Yaw;
+flat in float Depth;
+
+void
+main()
+{
+	int viewAngle = int(round(8 * Yaw / tau)) % 8;
+	vec3 texel = vec3(gl_PointCoord * vec2(-1, 1) + vec2(1, 0), viewAngle);
+	gAlbedoSpec = texture(billboardAlbedo, texel);
+	if (gAlbedoSpec.a < 0.5) {
+		discard;
+	}
+	gPosition = ivec4(ModelPos + vec3(0, 0, size * 2 * (1 - gl_PointCoord.y)), 1);
+	gNormal = texture(billboardNormal, texel) * vec4(-1, -1, 1, 1);
+}