Various fixes and documentation for CanvasGroup

Properly apply custom materials with CanvasGroups in the GLES3 backend

Properly blur backbuffer when using a partial rect in forward_plus and
gl_compatibility renderers

Properly set fit_margin when clear_margin is set

Fix shader error during backbuffer clear in mobile renderer

2 files changed, 3 insertions, 1 deletions

diff --git a/servers/rendering/renderer_rd/shaders/effects/copy.glsl b/servers/rendering/renderer_rd/shaders/effects/copy.glsl
index 5cc2ed7622..f440a05f73 100644
--- a/servers/rendering/renderer_rd/shaders/effects/copy.glsl
+++ b/servers/rendering/renderer_rd/shaders/effects/copy.glsl
@@ -93,7 +93,7 @@ void main() {
 #ifdef MODE_GAUSSIAN_BLUR
 
 	// First pass copy texture into 16x16 local memory for every 8x8 thread block
-	vec2 quad_center_uv = clamp(vec2(gl_GlobalInvocationID.xy + gl_LocalInvocationID.xy - 3.5) / params.section.zw, vec2(0.5 / params.section.zw), vec2(1.0 - 1.5 / params.section.zw));
+	vec2 quad_center_uv = clamp(vec2(params.section.xy + gl_GlobalInvocationID.xy + gl_LocalInvocationID.xy - 3.5) / params.section.zw, vec2(0.5 / params.section.zw), vec2(1.0 - 1.5 / params.section.zw));
 	uint dest_index = gl_LocalInvocationID.x * 2 + gl_LocalInvocationID.y * 2 * 16;
 
 #ifdef MODE_GLOW
diff --git a/servers/rendering/renderer_rd/shaders/effects/copy_to_fb.glsl b/servers/rendering/renderer_rd/shaders/effects/copy_to_fb.glsl
index 46bb99794d..6137224162 100644
--- a/servers/rendering/renderer_rd/shaders/effects/copy_to_fb.glsl
+++ b/servers/rendering/renderer_rd/shaders/effects/copy_to_fb.glsl
@@ -88,6 +88,7 @@ layout(push_constant, std430) uniform Params {
 }
 params;
 
+#ifndef MODE_SET_COLOR
 #ifdef MULTIVIEW
 layout(location = 0) in vec3 uv_interp;
 #else
@@ -106,6 +107,7 @@ layout(set = 0, binding = 0) uniform sampler2D source_color;
 layout(set = 1, binding = 0) uniform sampler2D source_color2;
 #endif /* MODE_TWO_SOURCES */
 #endif /* MULTIVIEW */
+#endif /* !SET_COLOR */
 
 layout(location = 0) out vec4 frag_color;