Merge pull request #19980 from JFonS/fix_light_vec_rotation

Move light 2D rotation to vertex shader

drivers/gles3/shaders/canvas.glsl

@@ -82,6 +82,7 @@ layout(std140) uniform LightData { //ubo:1
 
 
 out vec4 light_uv_interp;
+out vec2 transformed_light_uv;
 
 
 out vec4 local_rot;
@@ -236,6 +237,13 @@ VERTEX_SHADER_CODE
 
 	light_uv_interp.xy = (light_matrix * outvec).xy;
 	light_uv_interp.zw =(light_local_matrix * outvec).xy;
+
+	mat3 inverse_light_matrix = mat3(inverse(light_matrix));
+	inverse_light_matrix[0] = normalize(inverse_light_matrix[0]);
+	inverse_light_matrix[1] = normalize(inverse_light_matrix[1]);
+	inverse_light_matrix[2] = normalize(inverse_light_matrix[2]);
+	transformed_light_uv = (inverse_light_matrix * vec3(light_uv_interp.zw,0.0)).xy; //for normal mapping
+
 #ifdef USE_SHADOWS
 	pos=outvec.xy;
 #endif
@@ -304,6 +312,7 @@ layout(std140) uniform LightData {
 
 uniform lowp sampler2D light_texture; // texunit:-1
 in vec4 light_uv_interp;
+in vec2 transformed_light_uv;
 
 
 in vec4 local_rot;
@@ -520,11 +529,7 @@ FRAGMENT_SHADER_CODE
 
 #ifdef USE_LIGHTING
 
-	mat3 inverse_light_matrix = mat3(inverse(light_matrix));
-	inverse_light_matrix[0] = normalize(inverse_light_matrix[0]);
-	inverse_light_matrix[1] = normalize(inverse_light_matrix[1]);
-	inverse_light_matrix[2] = normalize(inverse_light_matrix[2]);
-	vec2 light_vec = (inverse_light_matrix * vec3(light_uv_interp.zw,0.0)).xy; //for normal mapping
+	vec2 light_vec = transformed_light_uv;
 
 	if (normal_used) {
 		normal.xy =  mat2(local_rot.xy,local_rot.zw) * normal.xy;