Fix #36700, z-depth not rendering properly at (n*256)+1 dimensions.

The chunk indices for scheduling chunks based on a given area were calculated incorrectly. This caused chunks at the very border of the render (pixels 256..257) to be omitted, leading to incorrect values
in the Z buffer of the test file, which in turn caused wrong normalization range and the resulting almost-white image.
Also added a dedicated executePixel function for Z buffer to avoid any interpolation of Z values.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/compositor/operations/COM_RenderLayersProg.h b/source/blender/compositor/operations/COM_RenderLayersProg.h
index 48aaa47cc50..04861174387 100644
--- a/source/blender/compositor/operations/COM_RenderLayersProg.h
+++ b/source/blender/compositor/operations/COM_RenderLayersProg.h
@@ -111,7 +111,6 @@ class RenderLayersAlphaProg : public RenderLayersBaseProg {
 public:
 	RenderLayersAlphaProg();
 	void executePixel(float output[4], float x, float y, PixelSampler sampler);
-
 };
 
 class RenderLayersColorOperation : public RenderLayersBaseProg {
@@ -127,6 +126,7 @@ public:
 class RenderLayersDepthProg : public RenderLayersBaseProg {
 public:
 	RenderLayersDepthProg();
+	void executePixel(float output[4], float x, float y, PixelSampler sampler);
 };
 
 class RenderLayersDiffuseOperation : public RenderLayersBaseProg {