Experimental support for windows with per-pixel transparency (macOS, X11 and Windows).

1 files changed, 47 insertions, 1 deletions

diff --git a/drivers/gles3/rasterizer_gles3.cpp b/drivers/gles3/rasterizer_gles3.cpp
index ca39d9f966..5f57deef17 100644
--- a/drivers/gles3/rasterizer_gles3.cpp
+++ b/drivers/gles3/rasterizer_gles3.cpp
@@ -292,7 +292,11 @@ void RasterizerGLES3::set_boot_image(const Ref<Image> &p_image, const Color &p_c
 	glViewport(0, 0, window_w, window_h);
 	glDisable(GL_BLEND);
 	glDepthMask(GL_FALSE);
-	glClearColor(p_color.r, p_color.g, p_color.b, 1.0);
+	if (OS::get_singleton()->get_window_per_pixel_transparency_enabled()) {
+		glClearColor(0.0, 0.0, 0.0, 0.0);
+	} else {
+		glClearColor(p_color.r, p_color.g, p_color.b, 1.0);
+	}
 	glClear(GL_COLOR_BUFFER_BIT);
 	canvas->canvas_begin();
 
@@ -331,6 +335,27 @@ void RasterizerGLES3::set_boot_image(const Ref<Image> &p_image, const Color &p_c
 
 	storage->free(texture); // free since it's only one frame that stays there
 
+	if (OS::get_singleton()->is_layered_allowed()) {
+		if (OS::get_singleton()->get_window_per_pixel_transparency_enabled()) {
+#ifdef WINDOWS_ENABLED
+			Size2 wndsize = OS::get_singleton()->get_layered_buffer_size();
+			uint8_t *data = OS::get_singleton()->get_layered_buffer_data();
+			if (data) {
+				glReadPixels(0, 0, wndsize.x, wndsize.y, GL_BGRA, GL_UNSIGNED_BYTE, data);
+				OS::get_singleton()->swap_layered_buffer();
+
+				return;
+			}
+#endif
+		} else {
+			//clear alpha
+			glColorMask(false, false, false, true);
+			glClearColor(0, 0, 0, 1);
+			glClear(GL_COLOR_BUFFER_BIT);
+			glColorMask(true, true, true, true);
+		}
+	}
+
 	OS::get_singleton()->swap_buffers();
 }
 
@@ -367,6 +392,27 @@ void RasterizerGLES3::blit_render_target_to_screen(RID p_render_target, const Re
 
 void RasterizerGLES3::end_frame(bool p_swap_buffers) {
 
+	if (OS::get_singleton()->is_layered_allowed()) {
+		if (OS::get_singleton()->get_window_per_pixel_transparency_enabled()) {
+#ifdef WINDOWS_ENABLED
+			Size2 wndsize = OS::get_singleton()->get_layered_buffer_size();
+			uint8_t *data = OS::get_singleton()->get_layered_buffer_data();
+			if (data) {
+				glReadPixels(0, 0, wndsize.x, wndsize.y, GL_BGRA, GL_UNSIGNED_BYTE, data);
+				OS::get_singleton()->swap_layered_buffer();
+
+				return;
+			}
+#endif
+		} else {
+			//clear alpha
+			glColorMask(false, false, false, true);
+			glClearColor(0, 0, 0, 1);
+			glClear(GL_COLOR_BUFFER_BIT);
+			glColorMask(true, true, true, true);
+		}
+	}
+
 	if (p_swap_buffers)
 		OS::get_singleton()->swap_buffers();
 	else