Workbench: Smoke: Fix display

Includes the following fixes
- Fix smoke texture creation: data was interpreted as Byte instead of Floats.
- Fix Velocity texture not being free after draw: also was causing crashes.
- Fix display_thickness not being copied during COW.
- Fix Blending and general volume rendering algorithm.
- Add Volume Shadowing support.

1 files changed, 5 insertions, 3 deletions

diff --git a/source/blender/draw/engines/workbench/shaders/workbench_volume_vert.glsl b/source/blender/draw/engines/workbench/shaders/workbench_volume_vert.glsl
index 90a22d9d02f..7ce21c3d5ca 100644
--- a/source/blender/draw/engines/workbench/shaders/workbench_volume_vert.glsl
+++ b/source/blender/draw/engines/workbench/shaders/workbench_volume_vert.glsl
@@ -1,5 +1,6 @@
 
 uniform mat4 ModelViewProjectionMatrix;
+uniform vec3 OrcoTexCoFactors[2];
 uniform float slicePosition;
 uniform int sliceAxis; /* -1 is no slice, 0 is X, 1 is Y, 2 is Z. */
 
@@ -23,9 +24,10 @@ void main()
 	else {
 		localPos = vec3(pos.xy, slicePosition * 2.0 - 1.0);
 	}
-
-	gl_Position = ModelViewProjectionMatrix * vec4(localPos, 1.0);
+	vec3 final_pos = localPos;
 #else
-	gl_Position = ModelViewProjectionMatrix * vec4(pos, 1.0);
+	vec3 final_pos = pos;
 #endif
+	final_pos = ((final_pos * 0.5 + 0.5) - OrcoTexCoFactors[0]) / OrcoTexCoFactors[1];
+	gl_Position = ModelViewProjectionMatrix * vec4(final_pos, 1.0);
 }