Add multiview to the opengl3 driver

3 files changed, 28 insertions, 18 deletions

diff --git a/modules/webxr/godot_webxr.h b/modules/webxr/godot_webxr.h
index 34d068be3e..d8d5bd99cc 100644
--- a/modules/webxr/godot_webxr.h
+++ b/modules/webxr/godot_webxr.h
@@ -65,7 +65,7 @@ extern int godot_webxr_get_view_count();
 extern int *godot_webxr_get_render_target_size();
 extern float *godot_webxr_get_transform_for_eye(int p_eye);
 extern float *godot_webxr_get_projection_for_eye(int p_eye);
-extern void godot_webxr_commit_for_eye(int p_eye, unsigned int p_destination_fbo);
+extern void godot_webxr_commit(unsigned int p_texture);
 
 extern void godot_webxr_sample_controller_data();
 extern int godot_webxr_get_controller_count();
diff --git a/modules/webxr/native/library_godot_webxr.js b/modules/webxr/native/library_godot_webxr.js
index 9b75796ee5..c476a54c59 100644
--- a/modules/webxr/native/library_godot_webxr.js
+++ b/modules/webxr/native/library_godot_webxr.js
@@ -337,20 +337,18 @@ const GodotWebXR = {
 		return buf;
 	},
 
-	godot_webxr_commit_for_eye__proxy: 'sync',
-	godot_webxr_commit_for_eye__sig: 'vii',
-	godot_webxr_commit_for_eye: function (p_eye, p_destination_fbo) {
+	godot_webxr_commit__proxy: 'sync',
+	godot_webxr_commit__sig: 'vi',
+	godot_webxr_commit: function (p_texture) {
 		if (!GodotWebXR.session || !GodotWebXR.pose) {
 			return;
 		}
 
-		const view_index = (p_eye === 2 /* ARVRInterface::EYE_RIGHT */) ? 1 : 0;
 		const glLayer = GodotWebXR.session.renderState.baseLayer;
-		const view = GodotWebXR.pose.views[view_index];
-		const viewport = glLayer.getViewport(view);
+		const views = GodotWebXR.pose.views;
 		const gl = GodotWebXR.gl;
 
-		const framebuffer = GL.framebuffers[p_destination_fbo];
+		const texture = GL.textures[p_texture];
 
 		const orig_framebuffer = gl.getParameter(gl.FRAMEBUFFER_BINDING);
 		const orig_read_framebuffer = gl.getParameter(gl.READ_FRAMEBUFFER_BINDING);
@@ -359,14 +357,27 @@ const GodotWebXR = {
 
 		// Copy from Godot render target into framebuffer from WebXR.
 		gl.bindFramebuffer(gl.FRAMEBUFFER, null);
-		gl.bindFramebuffer(gl.READ_FRAMEBUFFER, framebuffer);
-		gl.readBuffer(gl.COLOR_ATTACHMENT0);
-		gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, glLayer.framebuffer);
-
-		// Flip Y upside down on destination.
-		gl.blitFramebuffer(0, 0, viewport.width, viewport.height,
-			viewport.x, viewport.height, viewport.width, viewport.y,
-			gl.COLOR_BUFFER_BIT, gl.NEAREST);
+		for (let i = 0; i < views.length; i++) {
+			const viewport = glLayer.getViewport(views[i]);
+
+			const read_fbo = gl.createFramebuffer();
+			gl.bindFramebuffer(gl.READ_FRAMEBUFFER, read_fbo);
+			if (views.length > 1) {
+				gl.framebufferTextureLayer(gl.READ_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, texture, 0, i);
+			} else {
+				gl.framebufferTexture2D(gl.READ_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
+			}
+			gl.readBuffer(gl.COLOR_ATTACHMENT0);
+			gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, glLayer.framebuffer);
+
+			// Flip Y upside down on destination.
+			gl.blitFramebuffer(0, 0, viewport.width, viewport.height,
+				viewport.x, viewport.y + viewport.height, viewport.x + viewport.width, viewport.y,
+				gl.COLOR_BUFFER_BIT, gl.NEAREST);
+
+			gl.bindFramebuffer(gl.READ_FRAMEBUFFER, null);
+			gl.deleteFramebuffer(read_fbo);
+		}
 
 		// Restore state.
 		gl.bindFramebuffer(gl.FRAMEBUFFER, orig_framebuffer);
diff --git a/modules/webxr/webxr_interface_js.cpp b/modules/webxr/webxr_interface_js.cpp
index 6b671c1660..f6ed9f027e 100644
--- a/modules/webxr/webxr_interface_js.cpp
+++ b/modules/webxr/webxr_interface_js.cpp
@@ -415,8 +415,7 @@ Vector<BlitToScreen> WebXRInterfaceJS::post_draw_viewport(RID p_render_target, c
 
 	GLES3::RenderTarget *rt = texture_storage->get_render_target(p_render_target);
 
-	// @todo Support multiple eyes!
-	godot_webxr_commit_for_eye(1, rt->fbo);
+	godot_webxr_commit(rt->color);
 
 	return blit_to_screen;
 };