Silhouette Overlap Overlay

Added Object Overlap Overlay

 - Added R32UI support to GPU_framebuffer
 - Added R32U support to draw manager
 - The overlay mode has a object data pass that will render 'needed' data to specific buffers so we can mix them together via a deferred rendering. In future will also add UV's and other data
 - Overlap is implemented as an overlay so it could be used on top of the Scene lighted Solid mode (that will be rendered by Eevee.

Reviewers: fclem, brecht

Reviewed By: fclem

Subscribers: sergey

Tags: #code_quest

Maniphest Tasks: T54726

Differential Revision: https://developer.blender.org/D3174

1 files changed, 59 insertions, 0 deletions

diff --git a/source/blender/draw/engines/workbench/shaders/workbench_composite_frag.glsl b/source/blender/draw/engines/workbench/shaders/workbench_composite_frag.glsl
new file mode 100644
index 00000000000..ccb94f56db8
--- /dev/null
+++ b/source/blender/draw/engines/workbench/shaders/workbench_composite_frag.glsl
@@ -0,0 +1,59 @@
+out vec4 fragColor;
+
+uniform usampler2D objectId;
+uniform sampler2D depth;
+uniform sampler2D diffuseColor;
+uniform sampler2D normalViewport;
+uniform vec2 invertedViewportSize;
+
+uniform vec3 objectOverlapColor = vec3(0.0);
+
+layout(std140) uniform world_block {
+	WorldData world_data;
+};
+
+
+void main()
+{
+	ivec2 texel = ivec2(gl_FragCoord.xy);
+	vec2 uvViewport = gl_FragCoord.xy * invertedViewportSize;
+	float depth = texelFetch(depth, texel, 0).r;
+
+#ifndef V3D_DRAWOPTION_OBJECT_OVERLAP
+	if (depth == 1.0) {
+		fragColor = vec4(background_color(world_data, uvViewport.y), 0.0);
+		return;
+	}
+#else /* !V3D_DRAWOPTION_OBJECT_OVERLAP */
+	uint object_id = depth == 1.0? NO_OBJECT_ID: texelFetch(objectId, texel, 0).r;
+	float object_overlap = calculate_object_overlap(objectId, texel, object_id);
+	
+	if (object_id == NO_OBJECT_ID) {
+		vec3 background = background_color(world_data, uvViewport.y);
+		if (object_overlap == 0.0) {
+			fragColor = vec4(background, 0.0);
+		} else {
+			fragColor = vec4(mix(objectOverlapColor, background, object_overlap), 1.0-object_overlap);
+		}
+		return;
+	}
+#endif /* !V3D_DRAWOPTION_OBJECT_OVERLAP */
+
+	vec3 diffuse_color = texelFetch(diffuseColor, texel, 0).rgb;
+
+#ifdef V3D_LIGHTING_STUDIO
+	vec3 normal_viewport = texelFetch(normalViewport, texel, 0).rgb;
+	vec3 diffuse_light = get_world_diffuse_light(world_data, normal_viewport);
+	vec3 shaded_color = diffuse_light * diffuse_color;
+
+#else /* V3D_LIGHTING_STUDIO */
+	vec3 shaded_color = diffuse_color;
+#endif /* V3D_LIGHTING_STUDIO */
+
+
+#ifdef V3D_DRAWOPTION_OBJECT_OVERLAP
+	shaded_color = mix(objectOverlapColor, shaded_color, object_overlap);
+#endif /* V3D_DRAWOPTION_OBJECT_OVERLAP */
+
+	fragColor = vec4(shaded_color, 1.0);
+}