Calculate pixel snap in canvas space instead of world space

This ensures that you are actually snapping to pixels in the viewport and not an arbitrary amount

Author: clayjohn

drivers/gles3/shaders/canvas.glsl

@@ -262,15 +262,15 @@ void main() {
 
 	color_interp = color;
 
+	vertex = (canvas_transform * vec4(vertex, 0.0, 1.0)).xy;
+
 	if (use_pixel_snap) {
 		vertex = floor(vertex + 0.5);
 		// precision issue on some hardware creates artifacts within texture
 		// offset uv by a small amount to avoid
 		uv += 1e-5;
 	}
 
-	vertex = (canvas_transform * vec4(vertex, 0.0, 1.0)).xy;
-
 	vertex_interp = vertex;
 	uv_interp = uv;
 

servers/rendering/renderer_rd/shaders/canvas.glsl

@@ -214,15 +214,15 @@ void main() {
 
 	color_interp = color;
 
+	vertex = (canvas_data.canvas_transform * vec4(vertex, 0.0, 1.0)).xy;
+
 	if (canvas_data.use_pixel_snap) {
 		vertex = floor(vertex + 0.5);
 		// precision issue on some hardware creates artifacts within texture
 		// offset uv by a small amount to avoid
 		uv += 1e-5;
 	}
 
-	vertex = (canvas_data.canvas_transform * vec4(vertex, 0.0, 1.0)).xy;
-
 	vertex_interp = vertex;
 	uv_interp = uv;