port: fix new fb effects when MSAA is on

port/fast3d/gfx_opengl.cpp

@@ -1110,7 +1110,7 @@ void gfx_opengl_select_texture_fb(int fb_id) {
     glBindTexture(GL_TEXTURE_2D, framebuffers[fb_id].clrbuf);
 }
 
-void gfx_opengl_copy_framebuffer(int fb_dst, int fb_src, int left, int top, bool use_back) {
+void gfx_opengl_copy_framebuffer(int fb_dst, int fb_src, int left, int top, bool flip_y, bool use_back) {
     if (!gfx_framebuffers_enabled || fb_dst >= (int)framebuffers.size() || fb_src >= (int)framebuffers.size()) {
         return;
     }
@@ -1144,9 +1144,12 @@ void gfx_opengl_copy_framebuffer(int fb_dst, int fb_src, int left, int top, bool
     glBindFramebuffer(GL_READ_FRAMEBUFFER, src.fbo);
     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, dst.fbo);
 
-    if (fb_src == 0) {
+    if (flip_y) {
         // flip the dst rect to mirror the image vertically
         std::swap(dstY0, dstY1);
+    }
+
+    if (fb_src == 0) {
         glReadBuffer(use_back ? GL_BACK : GL_FRONT);
     } else {
         glReadBuffer(GL_COLOR_ATTACHMENT0);

port/fast3d/gfx_pc.cpp

@@ -2883,14 +2883,23 @@ extern "C" void gfx_set_framebuffer(int fb, float noise_scale) {
 }
 
 extern "C" void gfx_copy_framebuffer(int fb_dst, int fb_src, int left, int top, int use_back) {
-    if (fb_src == 0 && left > 0 && top > 0) {
-        // upscale the position
-        left = left * gfx_current_dimensions.width / gfx_current_native_viewport.width;
-        top = top * gfx_current_dimensions.height / gfx_current_native_viewport.height;
-        // flip Y
-        top = gfx_current_dimensions.height - top - 1;
+    const bool is_main_fb = (fb_src == 0);
+
+    if (is_main_fb) {
+        if (left > 0 && top > 0) {
+            // upscale the position
+            left = left * gfx_current_dimensions.width / gfx_current_native_viewport.width;
+            top = top * gfx_current_dimensions.height / gfx_current_native_viewport.height;
+            // flip Y
+            top = gfx_current_dimensions.height - top - 1;
+        }
+        if (use_back && gfx_msaa_level > 1) {
+            // read from the framebuffer we've been rendering to
+            fb_src = game_framebuffer;
+        }
     }
-    gfx_rapi->copy_framebuffer(fb_dst, fb_src, left, top, (bool)use_back);
+
+    gfx_rapi->copy_framebuffer(fb_dst, fb_src, left, top, is_main_fb, (bool)use_back);
 }
 
 extern "C" void gfx_reset_framebuffer(void) {

port/fast3d/gfx_rendering_api.h

@@ -44,7 +44,7 @@ struct GfxRenderingAPI {
                                           bool opengl_invert_y, bool render_target, bool has_depth_buffer,
                                           bool can_extract_depth);
     bool (*start_draw_to_framebuffer)(int fb_id, float noise_scale);
-    void (*copy_framebuffer)(int fb_dst, int fb_src, int left, int top, bool use_back);
+    void (*copy_framebuffer)(int fb_dst, int fb_src, int left, int top, bool flip_y, bool use_back);
     void (*clear_framebuffer)(void);
     void (*resolve_msaa_color_buffer)(int fb_id_target, int fb_id_source);
     void* (*get_framebuffer_texture_id)(int fb_id);

port/include/video.h

@@ -28,6 +28,7 @@ void videoSetFramebuffer(s32 target);
 void videoResetFramebuffer(void);
 void videoCopyFramebuffer(s32 dst, s32 src, s32 left, s32 top);
 void videoResizeFramebuffer(s32 target, u32 w, u32 h, s32 upscale, s32 autoresize);
+s32 videoFramebuffersSupported(void);
 
 void videoResetTextureCache(void);
 void videoFreeCachedTexture(const void *texptr);

port/src/video.c

@@ -163,6 +163,11 @@ void videoResetFramebuffer(void)
 	return gfx_reset_framebuffer();
 }
 
+s32 videoFramebuffersSupported(void)
+{
+	return gfx_framebuffers_enabled;
+}
+
 void videoResizeFramebuffer(s32 target, u32 w, u32 h, s32 upscale, s32 autoresize)
 {
 	gfx_resize_framebuffer(target, w, h, upscale, autoresize);

src/game/bondview.c

@@ -284,6 +284,12 @@ Gfx *bviewDrawMotionBlur(Gfx *gdl, u32 colour, u32 alpha)
 
 	var8007f844 = 0;
 
+#ifndef PLATFORM_N64
+	if (!videoFramebuffersSupported()) {
+		return gdl;
+	}
+#endif
+
 	mainOverrideVariable("sfxxx", &sfxxx);
 	fxxx = sfxxx / 1000.0f;
 	mainOverrideVariable("sfyyy", &sfyyy);
@@ -510,6 +516,12 @@ Gfx *bviewDrawZoomBlur(Gfx *gdl, u32 colour, s32 alpha, f32 arg3, f32 arg4)
 		return gdl;
 	}
 
+#ifndef PLATFORM_N64
+	if (!videoFramebuffersSupported()) {
+		return gdl;
+	}
+#endif
+
 	strcpy(var800a41c0, "stretchBlurGfx");
 
 	gDPPipeSync(gdl++);
@@ -567,15 +579,21 @@ f32 bview0f142d74(s32 arg0, f32 arg1, f32 arg2, f32 arg3)
 
 static inline Gfx *bviewDrawFisheyeLine(Gfx *gdl, s32 viewleft, s32 viewwidth, s32 y, f32 scale)
 {
+	if (!videoFramebuffersSupported()) {
+		return gdl;
+	}
+
 	const f32 orighalfw = viewwidth * 0.5f;
 	const f32 xcenter = viewleft + orighalfw;
 	const f32 halfw = orighalfw * scale;
 	const s32 left = xcenter - halfw;
 	const s32 right = xcenter + halfw;
+
 	gSPImageRectangleEXT(gdl++,
 		left << 2, y << 2, viewleft, y,
 		right << 2, (y + 1) << 2, viewleft + viewwidth, y + 1,
 		0, videoGetNativeWidth(), videoGetNativeHeight());
+
 	return gdl;
 }