tonemap

1 files changed, 85 insertions, 0 deletions

diff --git a/intermediate/tonemap.glsl b/intermediate/tonemap.glsl
new file mode 100644
index 0000000..5c41a6e
--- /dev/null
+++ b/intermediate/tonemap.glsl
@@ -0,0 +1,85 @@
+#ifdef DESC
+[program]
+type: graphics
+vertex: main
+fragment: main
+
+[binding]
+name: verts
+rate: vertex
+[attribute]
+name: position
+type: vec2
+[attribute]
+name: uv
+type: vec2
+
+[interpolator]
+name: uv
+type: vec2
+
+[struct]
+name: Config
+[variable]
+name: exposure
+type: float
+
+[cbuffer]
+name: config
+type: Config
+stage: fragment
+
+[texture]
+name: src
+stage: fragment
+dimension: 2
+
+[target]
+name: colour
+type: vec4
+#endif
+
+#ifdef VERTEX_SHADER
+void main() {
+	interpolator.uv = uv;
+	gl_Position = vec4(position, 1.0, 1.0);
+}
+#endif
+
+#ifdef FRAGMENT_SHADER
+
+vec3 to_srgb(vec3 lin) {
+	bvec3 cutoff = lessThan(lin, 0.0031308.xxx);
+	vec3 higher = 1.055.xxx * pow(lin, vec3(1.0 / 2.4)) - 0.055.xxx;
+	vec3 lower = lin.rgb * 12.92.xxx;
+	return mix(higher, lower, cutoff);
+}
+
+vec3 aces(vec3 x) {
+	float a = 2.51;
+	float b = 0.03;
+	float c = 2.43;
+	float d = 0.59;
+	float e = 0.14;
+	return clamp(
+		(x * (a * x + b)) / (x * (c * x + d) + e),
+		0.0,
+		1.0f
+	);
+}
+
+vec3 hejl(vec3 x, float whitepoint) {
+	vec4 vh = vec4(x, whitepoint);
+	vec4 va = (1.425 * vh) + 0.05;
+	vec4 vf = ((vh * va + 0.004f) / ((vh * (va + 0.55f) + 0.0491f))) - 0.0821f;
+	return vf.rgb / vf.www;
+}
+
+void main() {
+	vec2 uv = interpolator.uv;
+	vec3 lin = texture(src, uv).rgb * config.exposure;
+	lin = hejl(lin, 1.0);
+	colour = vec4(to_srgb(lin), 1.0);
+}
+#endif
+