Re-implemented screen space ambient occlusion

1 files changed, 49 insertions, 0 deletions

diff --git a/servers/visual/rasterizer_rd/shaders/ssao_minify.glsl b/servers/visual/rasterizer_rd/shaders/ssao_minify.glsl
new file mode 100644
index 0000000000..0e6f8b7d9a
--- /dev/null
+++ b/servers/visual/rasterizer_rd/shaders/ssao_minify.glsl
@@ -0,0 +1,49 @@
+/* clang-format off */
+[compute]
+/* clang-format on */
+
+#version 450
+
+VERSION_DEFINES
+
+layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
+
+layout(push_constant, binding = 1, std430) uniform Params {
+	vec2 pixel_size;
+	float z_far;
+	float z_near;
+	ivec2 source_size;
+	bool orthogonal;
+	uint pad;
+} params;
+
+
+#ifdef MINIFY_START
+layout(set = 0, binding = 0) uniform sampler2D source_texture;
+#else
+layout(r32f, set = 0, binding = 0) uniform restrict readonly image2D source_image;
+#endif
+layout(r32f, set = 1, binding = 0) uniform restrict writeonly image2D dest_image;
+
+void main() {
+
+	ivec2 pos = ivec2(gl_GlobalInvocationID.xy);
+
+	if (any(greaterThan(pos,params.source_size>>1))) { //too large, do nothing
+		return;
+	}
+
+#ifdef MINIFY_START
+	float depth = texelFetch(source_texture,pos<<1,0).r * 2.0 - 1.0;
+	if (params.orthogonal) {
+		depth = ((depth + (params.z_far + params.z_near) / (params.z_far - params.z_near)) * (params.z_far - params.z_near)) / 2.0;
+	} else {
+		depth = 2.0 * params.z_near * params.z_far / (params.z_far + params.z_near - depth * (params.z_far - params.z_near));
+	}
+#else
+	float depth = imageLoad(source_image,pos<<1).r;
+#endif
+
+	imageStore(dest_image,pos,vec4(depth));
+
+}