ANDROID: Add initial 16bit gfx support

Supported pixel formats: 565, 5551, 4444
Missing: 555 (doesn't exist on GLES)

6 files changed, 235 insertions, 38 deletions

diff --git a/backends/platform/android/android.cpp b/backends/platform/android/android.cpp
index 43b618d37b..0cfe7c9a22 100644
--- a/backends/platform/android/android.cpp
+++ b/backends/platform/android/android.cpp
@@ -110,6 +110,8 @@ OSystem_Android::OSystem_Android(int audio_sample_rate, int audio_buffer_size) :
 	_game_texture(0),
 	_overlay_texture(0),
 	_mouse_texture(0),
+	_mouse_texture_palette(0),
+	_mouse_texture_rgb(0),
 	_use_mouse_palette(false),
 	_show_mouse(false),
 	_show_overlay(false),
@@ -328,7 +330,8 @@ void OSystem_Android::initBackend() {
 
 	_game_texture = new GLESPalette888Texture();
 	_overlay_texture = new GLES4444Texture();
-	_mouse_texture = new GLESPalette8888Texture();
+	_mouse_texture_palette = new GLESPalette8888Texture();
+	_mouse_texture = _mouse_texture_palette;
 
 	// renice this thread to boost the audio thread
 	if (setpriority(PRIO_PROCESS, 0, 19) < 0)
@@ -591,7 +594,8 @@ void OSystem_Android::quit() {
 
 	delete _game_texture;
 	delete _overlay_texture;
-	delete _mouse_texture;
+	delete _mouse_texture_palette;
+	delete _mouse_texture_rgb;
 
 	deinitSurface();
 }
diff --git a/backends/platform/android/android.h b/backends/platform/android/android.h
index 3ccc84bc7e..2c0641f789 100644
--- a/backends/platform/android/android.h
+++ b/backends/platform/android/android.h
@@ -103,7 +103,7 @@ private:
 	bool _force_redraw;
 
 	// Game layer
-	GLESPalette888Texture *_game_texture;
+	GLESTexture *_game_texture;
 	int _shake_offset;
 	Common::Rect _focus_rect;
 
@@ -112,7 +112,9 @@ private:
 	bool _show_overlay;
 
 	// Mouse layer
-	GLESPalette8888Texture *_mouse_texture;
+	GLESTexture *_mouse_texture;
+	GLESPaletteTexture *_mouse_texture_palette;
+	GLESTexture *_mouse_texture_rgb;
 	Common::Point _mouse_hotspot;
 	int _mouse_targetscale;
 	bool _show_mouse;
@@ -144,6 +146,12 @@ private:
 	void deinitSurface();
 	void initViewport();
 
+#ifdef USE_RGB_COLOR
+	Common::String getPixelFormatName(const Graphics::PixelFormat &format) const;
+	void initTexture(GLESTexture **texture, uint width, uint height,
+						const Graphics::PixelFormat *format, bool alphaPalette);
+#endif
+
 	void setupKeymapper();
 	void _setCursorPalette(const byte *colors, uint start, uint num);
 
@@ -158,11 +166,18 @@ public:
 	virtual bool hasFeature(Feature f);
 	virtual void setFeatureState(Feature f, bool enable);
 	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;
+
+#ifdef USE_RGB_COLOR
+	virtual Graphics::PixelFormat getScreenFormat() const;
+	virtual Common::List<Graphics::PixelFormat> getSupportedFormats() const;
+#endif
+
 	virtual void initSize(uint width, uint height,
 							const Graphics::PixelFormat *format);
 	virtual int getScreenChangeID() const;
diff --git a/backends/platform/android/gfx.cpp b/backends/platform/android/gfx.cpp
index c71ee178ee..1b7679d0e5 100644
--- a/backends/platform/android/gfx.cpp
+++ b/backends/platform/android/gfx.cpp
@@ -62,6 +62,92 @@ int OSystem_Android::getGraphicsMode() const {
 	return 1;
 }
 
+#ifdef USE_RGB_COLOR
+Graphics::PixelFormat OSystem_Android::getScreenFormat() const {
+	return _game_texture->getPixelFormat();
+}
+
+Common::List<Graphics::PixelFormat> OSystem_Android::getSupportedFormats() const {
+	Common::List<Graphics::PixelFormat> res;
+	res.push_back(GLES565Texture::getPixelFormat());
+	res.push_back(GLES5551Texture::getPixelFormat());
+	res.push_back(GLES4444Texture::getPixelFormat());
+	res.push_back(Graphics::PixelFormat::createFormatCLUT8());
+
+	return res;
+}
+
+Common::String OSystem_Android::getPixelFormatName(const Graphics::PixelFormat &format) const {
+	if (format.bytesPerPixel == 1)
+		return "CLUT8";
+
+	if (format.aLoss == 8)
+		return Common::String::format("RGB%u%u%u",
+										8 - format.rLoss,
+										8 - format.gLoss,
+										8 - format.bLoss);
+
+	return Common::String::format("RGBA%u%u%u%u",
+									8 - format.rLoss,
+									8 - format.gLoss,
+									8 - format.bLoss,
+									8 - format.aLoss);
+}
+
+void OSystem_Android::initTexture(GLESTexture **texture,
+									uint width, uint height,
+									const Graphics::PixelFormat *format,
+									bool alphaPalette) {
+	assert(texture);
+	Graphics::PixelFormat format_clut8 =
+		Graphics::PixelFormat::createFormatCLUT8();
+	Graphics::PixelFormat format_current;
+	Graphics::PixelFormat format_new;
+
+	if (*texture)
+		format_current = (*texture)->getPixelFormat();
+	else
+		format_current = Graphics::PixelFormat();
+
+	if (format)
+		format_new = *format;
+	else
+		format_new = format_clut8;
+
+	if (format_current != format_new) {
+		if (*texture)
+			LOGD("switching pixel format from: %s",
+					getPixelFormatName((*texture)->getPixelFormat()).c_str());
+
+		delete *texture;
+
+		if (format_new == GLES565Texture::getPixelFormat())
+			*texture = new GLES565Texture();
+		else if (format_new == GLES5551Texture::getPixelFormat())
+			*texture = new GLES5551Texture();
+		else if (format_new == GLES4444Texture::getPixelFormat())
+			*texture = new GLES4444Texture();
+		else {
+			// TODO what now?
+			if (format_new != format_clut8)
+				LOGE("unsupported pixel format: %s",
+					getPixelFormatName(format_new).c_str());
+
+			if (alphaPalette)
+				*texture = new GLESPalette8888Texture;
+			else
+				*texture = new GLESPalette888Texture;
+		}
+
+		LOGD("new pixel format: %s",
+				getPixelFormatName((*texture)->getPixelFormat()).c_str());
+	}
+
+	(*texture)->allocBuffer(width, height);
+	(*texture)->fillBuffer(0);
+}
+#endif
+
 void OSystem_Android::initSurface() {
 	LOGD("initializing surface");
 
@@ -151,9 +237,6 @@ void OSystem_Android::initSize(uint width, uint height,
 
 	GLTHREADCHECK;
 
-	_game_texture->allocBuffer(width, height);
-	_game_texture->fillBuffer(0);
-
 	int overlay_width = _egl_surface_width;
 	int overlay_height = _egl_surface_height;
 
@@ -172,11 +255,17 @@ void OSystem_Android::initSize(uint width, uint height,
 
 	_overlay_texture->allocBuffer(overlay_width, overlay_height);
 
+#ifdef USE_RGB_COLOR
+	initTexture(&_game_texture, width, height, format, false);
+#else
+	_game_texture->allocBuffer(width, height);
+	_game_texture->fillBuffer(0);
+#endif
 	// Don't know mouse size yet - it gets reallocated in
 	// setMouseCursor.  We need the palette allocated before
 	// setMouseCursor however, so just take a guess at the desired
 	// size (it's small).
-	_mouse_texture->allocBuffer(20, 20);
+	_mouse_texture_palette->allocBuffer(20, 20);
 }
 
 int OSystem_Android::getScreenChangeID() const {
@@ -194,20 +283,30 @@ int16 OSystem_Android::getWidth() {
 void OSystem_Android::setPalette(const byte *colors, uint start, uint num) {
 	ENTER("%p, %u, %u", colors, start, num);
 
+#ifdef USE_RGB_COLOR
+	assert(_game_texture->getPixelFormat().bytesPerPixel == 1);
+#endif
+
 	GLTHREADCHECK;
 
+	memcpy(((GLESPaletteTexture *)_game_texture)->palette() + start * 3,
+			colors, num * 3);
+
 	if (!_use_mouse_palette)
 		_setCursorPalette(colors, start, num);
-
-	memcpy(_game_texture->palette() + start * 3, colors, num * 3);
 }
 
 void OSystem_Android::grabPalette(byte *colors, uint start, uint num) {
 	ENTER("%p, %u, %u", colors, start, num);
 
+#ifdef USE_RGB_COLOR
+	assert(_game_texture->getPixelFormat().bytesPerPixel == 1);
+#endif
+
 	GLTHREADCHECK;
 
-	memcpy(colors, _game_texture->palette_const() + start * 3, num * 3);
+	memcpy(colors, ((GLESPaletteTexture *)_game_texture)->palette() + start * 3,
+			num * 3);
 }
 
 void OSystem_Android::copyRectToScreen(const byte *buf, int pitch,
@@ -325,6 +424,7 @@ Graphics::Surface *OSystem_Android::lockScreen() {
 
 	GLTHREADCHECK;
 
+	// TODO this doesn't return any pixel data for non CLUT8
 	Graphics::Surface *surface = _game_texture->surface();
 	assert(surface->pixels);
 
@@ -353,6 +453,7 @@ void OSystem_Android::fillScreen(uint32 col) {
 
 	GLTHREADCHECK;
 
+	// TODO FIXME rgb colors
 	assert(col < 256);
 	_game_texture->fillBuffer(col);
 }
@@ -472,19 +573,39 @@ void OSystem_Android::setMouseCursor(const byte *buf, uint w, uint h,
 
 	assert(keycolor < 256);
 
-	_mouse_texture->allocBuffer(w, h);
+#ifdef USE_RGB_COLOR
+	if (format && format->bytesPerPixel > 1) {
+		if (_mouse_texture != _mouse_texture_rgb)
+			LOGD("switching to rgb mouse cursor");
 
-	// Update palette alpha based on keycolor
-	byte *palette = _mouse_texture->palette();
-	uint i = 256;
+		initTexture(&_mouse_texture_rgb, w, h, format, true);
 
-	do {
-		palette[3] = 0xff;
-		palette += 4;
-	} while (--i);
+		_mouse_texture = _mouse_texture_rgb;
+	} else {
+		if (_mouse_texture != _mouse_texture_palette)
+			LOGD("switching to paletted mouse cursor");
+
+		initTexture((GLESTexture **)&_mouse_texture_palette, w, h, format,
+					true);
+
+		_mouse_texture = _mouse_texture_palette;
+
+		delete _mouse_texture_rgb;
+		_mouse_texture_rgb = 0;
+	}
+#else
+	_mouse_texture_palette->allocBuffer(w, h);
+#endif
+
+	if (_mouse_texture->getPixelFormat().bytesPerPixel == 1) {
+		// Update palette alpha based on keycolor
+		byte *palette = _mouse_texture_palette->palette();
 
-	palette = _mouse_texture->palette();
-	palette[keycolor * 4 + 3] = 0x00;
+		for (uint i = 0; i < 256; ++i, palette += 4)
+			palette[3] = 0xff;
+
+		_mouse_texture_palette->palette()[keycolor * 4 + 3] = 0x00;
+	}
 
 	if (w == 0 || h == 0)
 		return;
@@ -497,17 +618,14 @@ void OSystem_Android::setMouseCursor(const byte *buf, uint w, uint h,
 
 void OSystem_Android::_setCursorPalette(const byte *colors,
 										uint start, uint num) {
-	byte *palette = _mouse_texture->palette() + start * 4;
-
-	do {
-		for (int i = 0; i < 3; ++i)
-			palette[i] = colors[i];
+	byte *palette = _mouse_texture_palette->palette() + start * 4;
 
+	for (uint i = 0; i < num; ++i, palette += 4, colors += 3) {
+		palette[0] = colors[0];
+		palette[1] = colors[1];
+		palette[2] = colors[2];
 		// Leave alpha untouched to preserve keycolor
-
-		palette += 4;
-		colors += 3;
-	} while (--num);
+	}
 }
 
 void OSystem_Android::setCursorPalette(const byte *colors,
@@ -516,6 +634,15 @@ void OSystem_Android::setCursorPalette(const byte *colors,
 
 	GLTHREADCHECK;
 
+	if (_mouse_texture->getPixelFormat().bytesPerPixel != 1) {
+		LOGD("switching to paletted mouse cursor");
+
+		_mouse_texture = _mouse_texture_palette;
+
+		delete _mouse_texture_rgb;
+		_mouse_texture_rgb = 0;
+	}
+
 	_setCursorPalette(colors, start, num);
 	_use_mouse_palette = true;
 }
@@ -523,6 +650,20 @@ void OSystem_Android::setCursorPalette(const byte *colors,
 void OSystem_Android::disableCursorPalette(bool disable) {
 	ENTER("%d", disable);
 
+	// when disabling the cursor palette, and we're running a clut8 game,
+	// it expects the game palette to be used for the cursor
+	if (disable && _game_texture->getPixelFormat().bytesPerPixel == 1) {
+		byte *src = ((GLESPaletteTexture *)_game_texture)->palette();
+		byte *dst = _mouse_texture_palette->palette();
+
+		for (uint i = 0; i < 256; ++i, src += 3, dst += 4) {
+			dst[0] = src[0];
+			dst[1] = src[1];
+			dst[2] = src[2];
+			// Leave alpha untouched to preserve keycolor
+		}
+	}
+
 	_use_mouse_palette = !disable;
 }
 
diff --git a/backends/platform/android/texture.cpp b/backends/platform/android/texture.cpp
index 05c551803b..e4c98e3ce0 100644
--- a/backends/platform/android/texture.cpp
+++ b/backends/platform/android/texture.cpp
@@ -83,11 +83,12 @@ void GLESTexture::initGLExtensions() {
 }
 
 GLESTexture::GLESTexture(byte bytesPerPixel, GLenum glFormat, GLenum glType,
-		size_t paletteSize) :
+		size_t paletteSize, Graphics::PixelFormat pixelFormat) :
 	_bytesPerPixel(bytesPerPixel),
 	_glFormat(glFormat),
 	_glType(glType),
 	_paletteSize(paletteSize),
+	_pixelFormat(pixelFormat),
 	_texture_width(0),
 	_texture_height(0),
 	_all_dirty(true)
@@ -279,14 +280,21 @@ void GLESTexture::drawTexture(GLshort x, GLshort y, GLshort w, GLshort h) {
 }
 
 GLES4444Texture::GLES4444Texture() :
-	GLESTexture(2, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, 0) {
+	GLESTexture(2, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, 0, getPixelFormat()) {
 }
 
 GLES4444Texture::~GLES4444Texture() {
 }
 
+GLES5551Texture::GLES5551Texture() :
+	GLESTexture(2, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, 0, getPixelFormat()) {
+}
+
+GLES5551Texture::~GLES5551Texture() {
+}
+
 GLES565Texture::GLES565Texture() :
-	GLESTexture(2, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 0) {
+	GLESTexture(2, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 0, getPixelFormat()) {
 }
 
 GLES565Texture::~GLES565Texture() {
@@ -294,7 +302,8 @@ GLES565Texture::~GLES565Texture() {
 
 GLESPaletteTexture::GLESPaletteTexture(byte bytesPerPixel, GLenum glFormat,
 										GLenum glType, size_t paletteSize) :
-	GLESTexture(bytesPerPixel, glFormat, glType, paletteSize),
+	GLESTexture(bytesPerPixel, glFormat, glType, paletteSize,
+				Graphics::PixelFormat::createFormatCLUT8()),
 	_texture(0)
 {
 }
diff --git a/backends/platform/android/texture.h b/backends/platform/android/texture.h
index 38a6228076..14eea44914 100644
--- a/backends/platform/android/texture.h
+++ b/backends/platform/android/texture.h
@@ -31,6 +31,7 @@
 #include <GLES/gl.h>
 
 #include "graphics/surface.h"
+#include "graphics/pixelformat.h"
 
 #include "common/rect.h"
 #include "common/array.h"
@@ -41,10 +42,11 @@ public:
 
 protected:
 	GLESTexture(byte bytesPerPixel, GLenum glFormat, GLenum glType,
-				size_t paletteSize);
-	virtual ~GLESTexture();
+				size_t paletteSize, Graphics::PixelFormat pixelFormat);
 
 public:
+	virtual ~GLESTexture();
+
 	void release();
 	void reinit();
 	void initSize();
@@ -82,6 +84,10 @@ public:
 		return _all_dirty || !_dirty_rect.isEmpty();
 	}
 
+	inline Graphics::PixelFormat getPixelFormat() const {
+		return _pixelFormat;
+	}
+
 protected:
 	inline void setDirty() {
 		_all_dirty = true;
@@ -110,6 +116,8 @@ protected:
 
 	// Covers dirty area
 	Common::Rect _dirty_rect;
+
+	Graphics::PixelFormat _pixelFormat;
 };
 
 // RGBA4444 texture
@@ -117,6 +125,21 @@ class GLES4444Texture : public GLESTexture {
 public:
 	GLES4444Texture();
 	virtual ~GLES4444Texture();
+
+	static inline Graphics::PixelFormat getPixelFormat() {
+		return Graphics::PixelFormat(2, 4, 4, 4, 4, 12, 8, 4, 0);
+	}
+};
+
+// RGBA5551 texture
+class GLES5551Texture : public GLESTexture {
+public:
+	GLES5551Texture();
+	virtual ~GLES5551Texture();
+
+	static inline Graphics::PixelFormat getPixelFormat() {
+		return Graphics::PixelFormat(2, 5, 5, 5, 1, 11, 6, 1, 0);
+	}
 };
 
 // RGB565 texture
@@ -124,15 +147,20 @@ class GLES565Texture : public GLESTexture {
 public:
 	GLES565Texture();
 	virtual ~GLES565Texture();
+
+	static inline Graphics::PixelFormat getPixelFormat() {
+		return Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0);
+	}
 };
 
 class GLESPaletteTexture : public GLESTexture {
 protected:
 	GLESPaletteTexture(byte bytesPerPixel, GLenum glFormat, GLenum glType,
 						size_t paletteSize);
-	virtual ~GLESPaletteTexture();
 
 public:
+	virtual ~GLESPaletteTexture();
+
 	virtual void allocBuffer(GLuint width, GLuint height);
 	virtual void updateBuffer(GLuint x, GLuint y, GLuint width, GLuint height,
 								const void *buf, int pitch);
diff --git a/configure b/configure
index 5c291dd560..fb453d1afa 100755
--- a/configure
+++ b/configure
@@ -2104,7 +2104,7 @@ fi
 # Enable 16bit support only for backends which support it
 #
 case $_backend in
-	dingux | dreamcast | gph | openpandora | psp | samsungtv | sdl | wii)
+	android | dingux | dreamcast | gph | openpandora | psp | samsungtv | sdl | wii)
 		if test "$_16bit" = auto ; then
 			_16bit=yes
 		else