Shader errors:

Count line from beginning of the whole shader source instead of each
string sepatately since it helps with finding out the error line in most
tested platforms

source/blender/gpu/intern/gpu_extensions.c

@@ -1407,12 +1407,12 @@ struct GPUShader {
 static void shader_print_errors(const char *task, char *log, const char **code, int totcode)
 {
 	int i;
+	int line = 1;
 
 	fprintf(stderr, "GPUShader: %s error:\n", task);
 
 	for (i = 0; i < totcode; i++) {
 		const char *c, *pos, *end = code[i] + strlen(code[i]);
-		int line = 1;
 
 		if ((G.debug & G_DEBUG)) {
 			fprintf(stderr, "===== shader string %d ====\n", i + 1);