From 8533f01be57d725e9c8e779869761f8f5d859b2e Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Sun, 5 Apr 2015 01:25:25 -0700
Subject: [PATCH] GBA Video: Ability to hide individual background layers, or
 OBJs

---
 CHANGES                            |  2 ++
 src/gba/renderers/video-software.c | 18 +++++++++++++-----
 src/gba/video.h                    |  3 +++
 src/platform/qt/Window.cpp         | 19 +++++++++++++++++++
 4 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/CHANGES b/CHANGES
index 916258735..4aacbb2bb 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,6 @@
 0.3.0: (Future)
+Features:
+ - Ability to hide individual background layers, or OBJs
 Bugfixes:
  - GBA: Fix timers not updating timing when writing to only the reload register
  - All: Fix sanitize-deb script not cleaning up after itself
diff --git a/src/gba/renderers/video-software.c b/src/gba/renderers/video-software.c
index eb8a1d193..54a409724 100644
--- a/src/gba/renderers/video-software.c
+++ b/src/gba/renderers/video-software.c
@@ -87,6 +87,12 @@ void GBAVideoSoftwareRendererCreate(struct GBAVideoSoftwareRenderer* renderer) {
 	renderer->d.finishFrame = GBAVideoSoftwareRendererFinishFrame;
 	renderer->d.getPixels = GBAVideoSoftwareRendererGetPixels;
 	renderer->d.putPixels = GBAVideoSoftwareRendererPutPixels;
+
+	renderer->d.disableBG[0] = false;
+	renderer->d.disableBG[1] = false;
+	renderer->d.disableBG[2] = false;
+	renderer->d.disableBG[3] = false;
+	renderer->d.disableOBJ = false;
 }
 
 static void GBAVideoSoftwareRendererInit(struct GBAVideoRenderer* renderer) {
@@ -522,6 +528,8 @@ static void GBAVideoSoftwareRendererDrawScanline(struct GBAVideoRenderer* render
 		softwareRenderer->windows[0].control.packed = 0xFF;
 	}
 
+	GBAVideoSoftwareRendererUpdateDISPCNT(softwareRenderer);
+
 	int w;
 	x = 0;
 	for (w = 0; w < softwareRenderer->nWindows; ++w) {
@@ -599,10 +607,10 @@ static void GBAVideoSoftwareRendererPutPixels(struct GBAVideoRenderer* renderer,
 }
 
 static void GBAVideoSoftwareRendererUpdateDISPCNT(struct GBAVideoSoftwareRenderer* renderer) {
-	renderer->bg[0].enabled = GBARegisterDISPCNTGetBg0Enable(renderer->dispcnt);
-	renderer->bg[1].enabled = GBARegisterDISPCNTGetBg1Enable(renderer->dispcnt);
-	renderer->bg[2].enabled = GBARegisterDISPCNTGetBg2Enable(renderer->dispcnt);
-	renderer->bg[3].enabled = GBARegisterDISPCNTGetBg3Enable(renderer->dispcnt);
+	renderer->bg[0].enabled = GBARegisterDISPCNTGetBg0Enable(renderer->dispcnt) && !renderer->d.disableBG[0];
+	renderer->bg[1].enabled = GBARegisterDISPCNTGetBg1Enable(renderer->dispcnt) && !renderer->d.disableBG[1];
+	renderer->bg[2].enabled = GBARegisterDISPCNTGetBg2Enable(renderer->dispcnt) && !renderer->d.disableBG[2];
+	renderer->bg[3].enabled = GBARegisterDISPCNTGetBg3Enable(renderer->dispcnt) && !renderer->d.disableBG[3];
 }
 
 static void GBAVideoSoftwareRendererWriteBGCNT(struct GBAVideoSoftwareRenderer* renderer, struct GBAVideoSoftwareBackground* bg, uint16_t value) {
@@ -691,7 +699,7 @@ static void _drawScanline(struct GBAVideoSoftwareRenderer* renderer, int y) {
 	int w;
 	renderer->end = 0;
 	int spriteLayers = 0;
-	if (GBARegisterDISPCNTIsObjEnable(renderer->dispcnt)) {
+	if (GBARegisterDISPCNTIsObjEnable(renderer->dispcnt) && !renderer->d.disableOBJ) {
 		if (renderer->oamDirty) {
 			_cleanOAM(renderer);
 		}
diff --git a/src/gba/video.h b/src/gba/video.h
index b7648719e..774f8de99 100644
--- a/src/gba/video.h
+++ b/src/gba/video.h
@@ -167,6 +167,9 @@ struct GBAVideoRenderer {
 	uint16_t* palette;
 	uint16_t* vram;
 	union GBAOAM* oam;
+
+	bool disableBG[4];
+	bool disableOBJ;
 };
 
 struct GBAVideo {
diff --git a/src/platform/qt/Window.cpp b/src/platform/qt/Window.cpp
index b9f7fffb8..01e21d221 100644
--- a/src/platform/qt/Window.cpp
+++ b/src/platform/qt/Window.cpp
@@ -799,6 +799,25 @@ void Window::setupMenu(QMenuBar* menubar) {
 	addControlledAction(avMenu, recordGIF, "recordGIF");
 #endif
 
+	avMenu->addSeparator();
+	QMenu* videoLayers = avMenu->addMenu(tr("Video layers"));
+
+	for (int i = 0; i < 4; ++i) {
+		QAction* enableBg = new QAction(tr("Background %0").arg(i), videoLayers);
+		enableBg->setCheckable(true);
+		enableBg->setChecked(true);
+		connect(enableBg, &QAction::triggered, [this, i](bool enable) { m_controller->thread()->gba->video.renderer->disableBG[i] = !enable; });
+		m_gameActions.append(enableBg);
+		addControlledAction(videoLayers, enableBg, QString("enableBG%0").arg(i));
+	}
+
+	QAction* enableObj = new QAction(tr("OBJ (sprites)"), videoLayers);
+	enableObj->setCheckable(true);
+	enableObj->setChecked(true);
+	connect(enableObj, &QAction::triggered, [this](bool enable) { m_controller->thread()->gba->video.renderer->disableOBJ = !enable; });
+	m_gameActions.append(enableObj);
+	addControlledAction(videoLayers, enableObj, "enableOBJ");
+
 	QMenu* toolsMenu = menubar->addMenu(tr("&Tools"));
 	m_shortcutController->addMenu(toolsMenu);
 	QAction* viewLogs = new QAction(tr("View &logs..."), toolsMenu);