IPHONE: Add support for unfiltered upscaling.

6 files changed, 64 insertions, 20 deletions

diff --git a/backends/platform/iphone/iphone_common.h b/backends/platform/iphone/iphone_common.h
index 2c573656a6..75a83a067b 100644
--- a/backends/platform/iphone/iphone_common.h
+++ b/backends/platform/iphone/iphone_common.h
@@ -50,6 +50,11 @@ enum UIViewSwipeDirection {
 	kUIViewSwipeRight = 8
 };
 
+typedef enum {
+	kGraphicsModeLinear = 0,
+	kGraphicsModeNone = 1
+} GraphicsModes;
+
 #ifdef IPHONE_OFFICIAL
 void iphone_main(int argc, char **argv);
 #endif
@@ -65,6 +70,7 @@ void iphone_main(int argc, char *argv[]);
 #endif
 
 // On the ObjC side
+void iPhone_setGraphicsMode(int mode);
 void iPhone_updateScreen(int mouseX, int mouseY);
 void iPhone_updateScreenRect(unsigned short *screen, int x1, int y1, int x2, int y2);
 void iPhone_updateOverlayRect(unsigned short *screen, int x1, int y1, int x2, int y2);
diff --git a/backends/platform/iphone/iphone_video.h b/backends/platform/iphone/iphone_video.h
index 25208deaaf..f484ebbb9e 100644
--- a/backends/platform/iphone/iphone_video.h
+++ b/backends/platform/iphone/iphone_video.h
@@ -62,6 +62,8 @@
 
 - (void)initSurface;
 
+- (void)setGraphicsMode;
+
 - (void)updateSurface;
 - (void)updateMainSurface;
 - (void)updateOverlaySurface;
diff --git a/backends/platform/iphone/iphone_video.m b/backends/platform/iphone/iphone_video.m
index c1633841f5..2723cae23a 100644
--- a/backends/platform/iphone/iphone_video.m
+++ b/backends/platform/iphone/iphone_video.m
@@ -24,6 +24,7 @@
 #include "iphone_common.h"
 
 static iPhoneView *sharedInstance = nil;
+static GraphicsModes _graphicsMode = kGraphicsModeLinear;
 static int _width = 0;
 static int _height = 0;
 static int _fullWidth;
@@ -75,6 +76,12 @@ int printOglError(const char *file, int line) {
 	return retCode;
 }
 
+void iPhone_setGraphicsMode(int mode) {
+	_graphicsMode = mode;
+
+	[sharedInstance performSelectorOnMainThread:@selector(setGraphicsMode) withObject:nil waitUntilDone: YES];
+}
+
 void iPhone_showCursor(int state) {
 	_mouseCursorEnabled = state;
 }
@@ -201,6 +208,27 @@ bool getLocalMouseCoords(CGPoint *point) {
 	return true;
 }
 
+static void setFilterModeForTexture(GLuint tex, GraphicsModes mode) {
+	if (!tex)
+		return;
+
+	glBindTexture(GL_TEXTURE_2D, tex); printOpenGLError();
+
+	GLint filter = GL_LINEAR;
+
+	switch (mode) {
+	case kGraphicsModeLinear:
+		filter = GL_LINEAR;
+		break;
+
+	case kGraphicsModeNone:
+		filter = GL_NEAREST;
+		break;
+	}
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter); printOpenGLError();
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter); printOpenGLError();
+}
 
 @implementation iPhoneView
 
@@ -263,6 +291,12 @@ bool getLocalMouseCoords(CGPoint *point) {
 	// }
 }
 
+- (void)setGraphicsMode {
+	setFilterModeForTexture(_screenTexture, _graphicsMode);
+	setFilterModeForTexture(_overlayTexture, _graphicsMode);
+	setFilterModeForTexture(_mouseCursorTexture, _graphicsMode);
+}
+
 - (void)updateSurface {
 	if (!_needsScreenUpdate) {
 		return;
@@ -287,9 +321,7 @@ bool getLocalMouseCoords(CGPoint *point) {
 -(void)updateMouseCursor {
 	if (_mouseCursorTexture == 0) {
 		glGenTextures(1, &_mouseCursorTexture); printOpenGLError();
-		glBindTexture(GL_TEXTURE_2D, _mouseCursorTexture); printOpenGLError();
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); printOpenGLError();
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); printOpenGLError();
+		setFilterModeForTexture(_mouseCursorTexture, _graphicsMode);
 	}
 
 	glBindTexture(GL_TEXTURE_2D, _mouseCursorTexture); printOpenGLError();
@@ -487,18 +519,14 @@ bool getLocalMouseCoords(CGPoint *point) {
 	}
 
 	glGenTextures(1, &_screenTexture); printOpenGLError();
-	glBindTexture(GL_TEXTURE_2D, _screenTexture); printOpenGLError();
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); printOpenGLError();
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); printOpenGLError();
+	setFilterModeForTexture(_screenTexture, _graphicsMode);
 
 	if (_overlayTexture > 0) {
 		glDeleteTextures(1, &_overlayTexture); printOpenGLError();
 	}
 
 	glGenTextures(1, &_overlayTexture); printOpenGLError();
-	glBindTexture(GL_TEXTURE_2D, _overlayTexture); printOpenGLError();
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); printOpenGLError();
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); printOpenGLError();
+	setFilterModeForTexture(_overlayTexture, _graphicsMode);
 
 	if (_textureBuffer) {
 		free(_textureBuffer);
diff --git a/backends/platform/iphone/osys_main.cpp b/backends/platform/iphone/osys_main.cpp
index 06b32270f4..3395ea6e56 100644
--- a/backends/platform/iphone/osys_main.cpp
+++ b/backends/platform/iphone/osys_main.cpp
@@ -45,7 +45,9 @@
 
 
 const OSystem::GraphicsMode OSystem_IPHONE::s_supportedGraphicsModes[] = {
-	{0, 0, 0}
+	{ "linear", "Linear filtering", kGraphicsModeLinear },
+	{ "none", "No filtering", kGraphicsModeNone },
+	{ 0, 0, 0 }
 };
 
 AQCallbackStruct OSystem_IPHONE::s_AudioQueue;
@@ -60,7 +62,8 @@ OSystem_IPHONE::OSystem_IPHONE() :
 	_screenOrientation(kScreenOrientationFlippedLandscape), _mouseClickAndDragEnabled(false),
 	_gestureStartX(-1), _gestureStartY(-1), _fullScreenIsDirty(false), _fullScreenOverlayIsDirty(false),
 	_mouseDirty(false), _timeSuspended(0), _lastDragPosX(-1), _lastDragPosY(-1), _screenChangeCount(0),
-	_overlayHeight(0), _overlayWidth(0), _overlayBuffer(0), _mouseCursorPaletteEnabled(false) {
+	_overlayHeight(0), _overlayWidth(0), _overlayBuffer(0), _mouseCursorPaletteEnabled(false),
+	_currentGraphicsMode(kGraphicsModeLinear) {
 	_queuedInputEvent.type = Common::EVENT_INVALID;
 	_touchpadModeEnabled = !iPhone_isHighResDevice();
 	_fsFactory = new POSIXFilesystemFactory();
diff --git a/backends/platform/iphone/osys_main.h b/backends/platform/iphone/osys_main.h
index 61816cfa35..e4b3d358d5 100644
--- a/backends/platform/iphone/osys_main.h
+++ b/backends/platform/iphone/osys_main.h
@@ -54,12 +54,13 @@ struct AQCallbackStruct {
 
 class OSystem_IPHONE : public EventsBaseBackend, public PaletteManager {
 protected:
-
 	static const OSystem::GraphicsMode s_supportedGraphicsModes[];
 	static AQCallbackStruct s_AudioQueue;
 	static SoundProc s_soundCallback;
 	static void *s_soundParam;
 
+	int _currentGraphicsMode;
+
 	Audio::MixerImpl *_mixer;
 
 	Graphics::Surface _framebuffer;
@@ -129,7 +130,6 @@ public:
 	virtual bool getFeatureState(Feature f);
 	virtual const GraphicsMode *getSupportedGraphicsModes() const;
 	virtual int getDefaultGraphicsMode() const;
-	bool setGraphicsMode(const char *name);
 	virtual bool setGraphicsMode(int mode);
 	virtual int getGraphicsMode() const;
 	virtual void initSize(uint width, uint height, const Graphics::PixelFormat *format);
diff --git a/backends/platform/iphone/osys_video.cpp b/backends/platform/iphone/osys_video.cpp
index 0483c72949..78c6cd4625 100644
--- a/backends/platform/iphone/osys_video.cpp
+++ b/backends/platform/iphone/osys_video.cpp
@@ -31,19 +31,24 @@ const OSystem::GraphicsMode *OSystem_IPHONE::getSupportedGraphicsModes() const {
 
 
 int OSystem_IPHONE::getDefaultGraphicsMode() const {
-	return -1;
-}
-
-bool OSystem_IPHONE::setGraphicsMode(const char *mode) {
-	return true;
+	return kGraphicsModeLinear;
 }
 
 bool OSystem_IPHONE::setGraphicsMode(int mode) {
-	return true;
+	switch (mode) {
+	case kGraphicsModeNone:
+	case kGraphicsModeLinear:
+		_currentGraphicsMode = mode;
+		iPhone_setGraphicsMode(mode);
+		return true;
+
+	default:
+		return false;
+	}
 }
 
 int OSystem_IPHONE::getGraphicsMode() const {
-	return -1;
+	return _currentGraphicsMode;
 }
 
 void OSystem_IPHONE::initSize(uint width, uint height, const Graphics::PixelFormat *format) {