1 files changed, 24 insertions, 0 deletions
diff --git a/source/blender/draw/engines/eevee_next/shaders/eevee_hiz_debug_frag.glsl b/source/blender/draw/engines/eevee_next/shaders/eevee_hiz_debug_frag.glsl
new file mode 100644
index 00000000000..e93d0f472fa
--- /dev/null
+++ b/source/blender/draw/engines/eevee_next/shaders/eevee_hiz_debug_frag.glsl
@@ -0,0 +1,24 @@
+
+/**
+ * Debug hiz down sampling pass.
+ * Output red if above any max pixels, blue otherwise.
+ */
+
+void main()
+{
+  ivec2 texel = ivec2(gl_FragCoord.xy);
+
+  float depth0 = texelFetch(hiz_tx, texel, 0).r;
+
+  vec4 color = vec4(0.1, 0.1, 1.0, 1.0);
+  for (int i = 1; i < HIZ_MIP_COUNT; i++) {
+    ivec2 lvl_texel = texel / ivec2(uvec2(1) << uint(i));
+    lvl_texel = min(lvl_texel, textureSize(hiz_tx, i) - 1);
+    if (texelFetch(hiz_tx, lvl_texel, i).r < depth0) {
+      color = vec4(1.0, 0.1, 0.1, 1.0);
+      break;
+    }
+  }
+  out_debug_color_add = vec4(color.rgb, 0.0) * 0.2;
+  out_debug_color_mul = color;
+}