[opengl] Don't flip render target when blitting it to screen if it wasn't rendered upside down

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/gles3/rasterizer_gles3.cpp b/drivers/gles3/rasterizer_gles3.cpp
index 1b42b55425..7b4131b3a3 100644
--- a/drivers/gles3/rasterizer_gles3.cpp
+++ b/drivers/gles3/rasterizer_gles3.cpp
@@ -285,6 +285,15 @@ void RasterizerGLES3::_blit_render_target_to_screen(RID p_render_target, Display
 
 	ERR_FAIL_COND(!rt);
 
+	// We normally render to the render target upside down, so flip Y when blitting to the screen.
+	bool flip_y = true;
+	if (rt->overridden.color.is_valid()) {
+		// If we've overridden the render target's color texture, that means we
+		// didn't render upside down, so we don't need to flip it.
+		// We're probably rendering directly to an XR device.
+		flip_y = false;
+	}
+
 	GLuint read_fbo = 0;
 	if (rt->view_count > 1) {
 		glGenFramebuffers(1, &read_fbo);
@@ -296,10 +305,9 @@ void RasterizerGLES3::_blit_render_target_to_screen(RID p_render_target, Display
 
 	glReadBuffer(GL_COLOR_ATTACHMENT0);
 	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, GLES3::TextureStorage::system_fbo);
-	// Flip content upside down to correct for coordinates.
 	Vector2i screen_rect_end = p_screen_rect.get_end();
 	glBlitFramebuffer(0, 0, rt->size.x, rt->size.y,
-			p_screen_rect.position.x, screen_rect_end.y, screen_rect_end.x, p_screen_rect.position.y,
+			p_screen_rect.position.x, flip_y ? screen_rect_end.y : p_screen_rect.position.y, screen_rect_end.x, flip_y ? p_screen_rect.position.y : screen_rect_end.y,
 			GL_COLOR_BUFFER_BIT, GL_NEAREST);
 
 	if (read_fbo != 0) {