Make wlr_renderer_scissor take normal coords instead of upside-down ones

include/render/gles2.h

@@ -38,6 +38,8 @@ struct wlr_gles2_renderer {
 		GLuint tex_rgbx;
 		GLuint tex_ext;
 	} shaders;
+
+	uint32_t viewport_width, viewport_height;
 };
 
 enum wlr_gles2_texture_type {

render/gles2/renderer.c

@@ -31,11 +31,14 @@ static struct wlr_gles2_renderer *gles2_get_renderer_in_context(
 
 static void gles2_begin(struct wlr_renderer *wlr_renderer, uint32_t width,
 		uint32_t height) {
-	gles2_get_renderer_in_context(wlr_renderer);
+	struct wlr_gles2_renderer *renderer =
+		gles2_get_renderer_in_context(wlr_renderer);
 
 	GLES2_DEBUG_PUSH;
 
 	glViewport(0, 0, width, height);
+	renderer->viewport_width = width;
+	renderer->viewport_height = height;
 
 	// enable transparency
 	glEnable(GL_BLEND);
@@ -64,11 +67,16 @@ static void gles2_clear(struct wlr_renderer *wlr_renderer,
 
 static void gles2_scissor(struct wlr_renderer *wlr_renderer,
 		struct wlr_box *box) {
-	gles2_get_renderer_in_context(wlr_renderer);
+	struct wlr_gles2_renderer *renderer =
+		gles2_get_renderer_in_context(wlr_renderer);
 
 	GLES2_DEBUG_PUSH;
 	if (box != NULL) {
-		glScissor(box->x, box->y, box->width, box->height);
+		struct wlr_box gl_box;
+		wlr_box_transform(box, WL_OUTPUT_TRANSFORM_FLIPPED_180,
+			renderer->viewport_width, renderer->viewport_height, &gl_box);
+
+		glScissor(gl_box.x, gl_box.y, gl_box.width, gl_box.height);
 		glEnable(GL_SCISSOR_TEST);
 	} else {
 		glDisable(GL_SCISSOR_TEST);

rootston/output.c

@@ -177,9 +177,8 @@ static void scissor_output(struct roots_output *output, pixman_box32_t *rect) {
 	wlr_output_transformed_resolution(output->wlr_output, &ow, &oh);
 
 	// Scissor is in renderer coordinates, ie. upside down
-	enum wl_output_transform transform = wlr_output_transform_compose(
-		wlr_output_transform_invert(wlr_output->transform),
-		WL_OUTPUT_TRANSFORM_FLIPPED_180);
+	enum wl_output_transform transform =
+		wlr_output_transform_invert(wlr_output->transform);
 	wlr_box_transform(&box, transform, ow, oh, &box);
 
 	wlr_renderer_scissor(renderer, &box);

types/wlr_output.c

@@ -339,9 +339,8 @@ static void output_scissor(struct wlr_output *output, pixman_box32_t *rect) {
 	wlr_output_transformed_resolution(output, &ow, &oh);
 
 	// Scissor is in renderer coordinates, ie. upside down
-	enum wl_output_transform transform = wlr_output_transform_compose(
-		wlr_output_transform_invert(output->transform),
-		WL_OUTPUT_TRANSFORM_FLIPPED_180);
+	enum wl_output_transform transform =
+		wlr_output_transform_invert(output->transform);
 	wlr_box_transform(&box, transform, ow, oh, &box);
 
 	wlr_renderer_scissor(renderer, &box);