scummvm/backends/graphics3d/android/android-graphics3d.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

// Allow use of stuff in <time.h>
#define FORBIDDEN_SYMBOL_EXCEPTION_time_h

// Disable printf override in common/forbidden.h to avoid
// clashes with log.h from the Android SDK.
// That header file uses
//   __attribute__ ((format(printf, 3, 4)))
// which gets messed up by our override mechanism; this could
// be avoided by either changing the Android SDK to use the equally
// legal and valid
//   __attribute__ ((format(printf, 3, 4)))
// or by refining our printf override to use a varadic macro
// (which then wouldn't be portable, though).
// Anyway, for now we just disable the printf override globally
// for the Android port
#define FORBIDDEN_SYMBOL_EXCEPTION_printf

#include "common/tokenizer.h"
#include "graphics/conversion.h"
#include "graphics/opengl/shader.h"
#include "graphics/opengl/context.h"

#include "backends/graphics3d/android/android-graphics3d.h"
#include "backends/platform/android/android.h"
#include "backends/platform/android/jni-android.h"

// These helper macros let us setup our context only when the game has different settings than us
#define CONTEXT_SAVE_STATE(gl_param) GLboolean saved ## gl_param; GLCALL(saved ## gl_param = glIsEnabled(gl_param))
#define CONTEXT_SET_ENABLE(gl_param) if (!(saved ## gl_param)) { GLCALL(glEnable(gl_param)); }
#define CONTEXT_SET_DISABLE(gl_param) if (saved ## gl_param) { GLCALL(glDisable(gl_param)); }
// These helper macros do the opposite to get back what the game expected
#define CONTEXT_RESET_ENABLE(gl_param) if (!(saved ## gl_param)) { GLCALL(glDisable(gl_param)); }
#define CONTEXT_RESET_DISABLE(gl_param) if (saved ## gl_param) { GLCALL(glEnable(gl_param)); }

AndroidGraphics3dManager::AndroidGraphics3dManager() :
	_screenChangeID(0),
	_graphicsMode(0),
	_fullscreen(true),
	_ar_correction(true),
	_force_redraw(false),
	_game_texture(0),
	_frame_buffer(0),
	_cursorX(0),
	_cursorY(0),
	_overlay_texture(0),
	_overlay_background(nullptr),
	_show_overlay(false),
	_mouse_texture(0),
	_mouse_texture_palette(0),
	_mouse_texture_rgb(0),
	_mouse_hotspot(),
	_mouse_keycolor(0),
	_show_mouse(false),
	_use_mouse_palette(false) {
	_game_texture = new GLESFakePalette565Texture();
	_overlay_texture = new GLES5551Texture();
	_overlay_background = new GLES5551Texture();
	_mouse_texture_palette = new GLESFakePalette5551Texture();
	_mouse_texture = _mouse_texture_palette;

	initSurface();
	JNI::setTouch3DMode(true);
}

AndroidGraphics3dManager::~AndroidGraphics3dManager() {
	// Reinitialize OpenGL for other manager
	glBindBuffer(GL_ARRAY_BUFFER, 0);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
	glBindFramebuffer(GL_FRAMEBUFFER, 0);
	glBindRenderbuffer(GL_RENDERBUFFER, 0);
	glUseProgram(0);

	deinitSurface();

	delete _frame_buffer;
	delete _game_texture;
	delete _overlay_texture;
	delete _overlay_background;
	delete _mouse_texture_palette;
	delete _mouse_texture_rgb;

	JNI::setTouch3DMode(false);
}

static void logExtensions() {
	const char *ext_string =
	    reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS));

	LOGI("Extensions:");

	Common::String exts;
	Common::StringTokenizer tokenizer(ext_string, " ");
	while (!tokenizer.empty()) {
		Common::String token = tokenizer.nextToken();

		exts += token + " ";
		if (exts.size() > 100) {
			LOGI("\t%s", exts.c_str());
			exts = "";
		}
	}

	if (exts.size() > 0) {
		LOGI("\t%s", exts.c_str());
	}
}


void AndroidGraphics3dManager::initSurface() {
	LOGD("initializing 3D surface");

	assert(!JNI::haveSurface());

	JNI::initSurface();

	_screenChangeID = JNI::surface_changeid;

	// Initialize OpenGLES context.
	OpenGLContext.initialize(OpenGL::kOGLContextGLES2);
	logExtensions();
	GLESTexture::initGL();

	if (_game_texture) {
		_game_texture->reinit();
		// We had a frame buffer initialized, we must renew it as the game textured got renewed
		if (_frame_buffer) {
			delete _frame_buffer;
			_frame_buffer = new OpenGL::FrameBuffer(_game_texture->getTextureName(),
	                                        _game_texture->width(), _game_texture->height(),
	                                        _game_texture->texWidth(), _game_texture->texHeight());

		}
	}

	// We don't have any content to display: just make sure surface is clean
	if (_overlay_background) {
		_overlay_background->release();
	}

	if (_overlay_texture) {
		_overlay_texture->reinit();
		initOverlay();
	}

	if (_mouse_texture) {
		_mouse_texture->reinit();
	}

	updateScreenRect();
	// double buffered, flip twice
	clearScreen(kClearUpdate, 2);

	dynamic_cast<OSystem_Android *>(g_system)->getTouchControls().init(
	    JNI::egl_surface_width, JNI::egl_surface_height);
}

void AndroidGraphics3dManager::deinitSurface() {
	if (!JNI::haveSurface()) {
		return;
	}

	LOGD("deinitializing 3D surface");

	_screenChangeID = JNI::surface_changeid;

	// release texture resources
	if (_game_texture) {
		_game_texture->release();
	}

	if (_overlay_texture) {
		_overlay_texture->release();
	}

	if (_overlay_background) {
		_overlay_background->release();
	}

	if (_mouse_texture) {
		_mouse_texture->release();
	}

	OpenGL::ContextGL::destroy();

	JNI::deinitSurface();
}

void AndroidGraphics3dManager::updateScreen() {
	//ENTER();

	GLTHREADCHECK;

	if (!JNI::haveSurface()) {
		return;
	}

	if (!_force_redraw &&
	        !_game_texture->dirty() &&
	        !_overlay_texture->dirty() &&
	        !_mouse_texture->dirty()) {
		return;
	}

	_force_redraw = false;

	// Save the game state
	GLint savedBlendSrcRGB, savedBlendDstRGB, savedBlendSrcAlpha, savedBlendDstAlpha,
	      savedBlendEqRGB, savedBlendEqAlpha;
	GLint savedViewport[4];
	CONTEXT_SAVE_STATE(GL_BLEND);
	GLCALL(glGetIntegerv(GL_BLEND_SRC_RGB, &savedBlendSrcRGB));
	GLCALL(glGetIntegerv(GL_BLEND_DST_RGB, &savedBlendDstRGB));
	GLCALL(glGetIntegerv(GL_BLEND_SRC_ALPHA, &savedBlendSrcAlpha));
	GLCALL(glGetIntegerv(GL_BLEND_DST_ALPHA, &savedBlendDstAlpha));
	GLCALL(glGetIntegerv(GL_BLEND_EQUATION_RGB, &savedBlendEqRGB));
	GLCALL(glGetIntegerv(GL_BLEND_EQUATION_ALPHA, &savedBlendEqAlpha));
	CONTEXT_SAVE_STATE(GL_CULL_FACE);
	CONTEXT_SAVE_STATE(GL_DEPTH_TEST);
	CONTEXT_SAVE_STATE(GL_DITHER);
	CONTEXT_SAVE_STATE(GL_POLYGON_OFFSET_FILL);
	CONTEXT_SAVE_STATE(GL_SAMPLE_ALPHA_TO_COVERAGE);
	CONTEXT_SAVE_STATE(GL_SAMPLE_COVERAGE);
	CONTEXT_SAVE_STATE(GL_SCISSOR_TEST);
	CONTEXT_SAVE_STATE(GL_STENCIL_TEST);
	GLCALL(glGetIntegerv(GL_VIEWPORT, savedViewport));

	if (_frame_buffer) {
		_frame_buffer->detach();
	}

	// Make sure everything we need is correctly set up
	// Enable what we need and disable the other if it is not already
	CONTEXT_SET_ENABLE(GL_BLEND);
	if (savedBlendSrcRGB != GL_SRC_ALPHA ||
	    savedBlendDstRGB != GL_ONE_MINUS_SRC_ALPHA ||
	    savedBlendSrcAlpha != GL_SRC_ALPHA ||
	    savedBlendDstAlpha != GL_ONE_MINUS_SRC_ALPHA) {
		GLCALL(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
	}
	if (savedBlendEqRGB != GL_FUNC_ADD ||
	    savedBlendEqAlpha != GL_FUNC_ADD) {
		GLCALL(glBlendEquation(GL_FUNC_ADD));
	}
	CONTEXT_SET_DISABLE(GL_CULL_FACE);
	CONTEXT_SET_DISABLE(GL_DEPTH_TEST);
	CONTEXT_SET_DISABLE(GL_DITHER);
	CONTEXT_SET_DISABLE(GL_POLYGON_OFFSET_FILL);
	CONTEXT_SET_DISABLE(GL_SAMPLE_ALPHA_TO_COVERAGE);
	CONTEXT_SET_DISABLE(GL_SAMPLE_COVERAGE);
	CONTEXT_SET_DISABLE(GL_SCISSOR_TEST);
	CONTEXT_SET_DISABLE(GL_STENCIL_TEST);

	glViewport(0, 0, JNI::egl_surface_width, JNI::egl_surface_height);

	// clear pointer leftovers in dead areas
	clearScreen(kClear);

	_game_texture->drawTextureRect();
	if (!_show_overlay) {
		dynamic_cast<OSystem_Android *>(g_system)->getTouchControls().draw();
	}

	int cs = _mouse_targetscale;

	if (_show_overlay) {
		// ugly, but the modern theme sets a wacko factor, only god knows why
		cs = 1;

		if (_overlay_background && _overlay_background->getTextureName() != 0) {
			GLCALL(_overlay_background->drawTextureRect());
		}
		GLCALL(_overlay_texture->drawTextureRect());
	}

	if (_show_mouse && !_mouse_texture->isEmpty()) {
		const Common::Point &mouse = g_system->getEventManager()->getMousePos();
		if (_show_overlay) {
			_mouse_texture->drawTexture(mouse.x * cs, mouse.y * cs,
			                            _mouse_texture->width(), _mouse_texture->height());
		}
	}

	if (!JNI::swapBuffers()) {
		LOGW("swapBuffers failed: 0x%x", glGetError());
	}

	// Here we restore back the GLES state so if we enabled something we disable it back if it needs too and vice versa

	CONTEXT_RESET_ENABLE(GL_BLEND);
	if (savedGL_BLEND && (
	    savedBlendSrcRGB != GL_SRC_ALPHA ||
	    savedBlendDstRGB != GL_ONE_MINUS_SRC_ALPHA ||
	    savedBlendSrcAlpha != GL_SRC_ALPHA ||
	    savedBlendDstAlpha != GL_ONE_MINUS_SRC_ALPHA)) {
		GLCALL(glBlendFuncSeparate(savedBlendSrcRGB, savedBlendDstRGB,
		                           savedBlendSrcAlpha, savedBlendDstAlpha));
	}
	if (savedGL_BLEND && (
	    savedBlendEqRGB != GL_FUNC_ADD ||
	    savedBlendEqAlpha != GL_FUNC_ADD)) {
		GLCALL(glBlendEquationSeparate(savedBlendEqRGB, savedBlendEqAlpha));
	}
	CONTEXT_RESET_DISABLE(GL_CULL_FACE);
	CONTEXT_RESET_DISABLE(GL_DEPTH_TEST);
	CONTEXT_RESET_DISABLE(GL_DITHER);
	CONTEXT_RESET_DISABLE(GL_POLYGON_OFFSET_FILL);
	CONTEXT_RESET_DISABLE(GL_SAMPLE_ALPHA_TO_COVERAGE);
	CONTEXT_RESET_DISABLE(GL_SAMPLE_COVERAGE);
	CONTEXT_RESET_DISABLE(GL_SCISSOR_TEST);
	CONTEXT_RESET_DISABLE(GL_STENCIL_TEST);

	// Restore game viewport
	GLCALL(glViewport(savedViewport[0], savedViewport[1], savedViewport[2], savedViewport[3]));

	// Don't keep our texture attached to avoid the engine writing on it if it forgets to setup its own texture
	GLCALL(glBindTexture(GL_TEXTURE_2D, 0));
	// Unload our program to make sure engine will use its own
	GLESBaseTexture::unbindShader();

	if (_frame_buffer) {
		_frame_buffer->attach();
	}
}

void AndroidGraphics3dManager::displayMessageOnOSD(const Common::U32String &msg) {
	ENTER("%s", msg.encode().c_str());

	JNI::displayMessageOnOSD(msg);
}

bool AndroidGraphics3dManager::notifyMousePosition(Common::Point &mouse) {
	clipMouse(mouse);
	setMousePosition(mouse.x, mouse.y);
	return true;
}

const OSystem::GraphicsMode *AndroidGraphics3dManager::getSupportedGraphicsModes() const {
	static const OSystem::GraphicsMode s_supportedGraphicsModes[] = {
		{ "default", "Default", 0 },
		{ 0, 0, 0 },
	};

	return s_supportedGraphicsModes;
}

int AndroidGraphics3dManager::getDefaultGraphicsMode() const {
	return 0;
}

bool AndroidGraphics3dManager::setGraphicsMode(int mode, uint flags) {
	return true;
}

int AndroidGraphics3dManager::getGraphicsMode() const {
	return _graphicsMode;
}

bool AndroidGraphics3dManager::hasFeature(OSystem::Feature f) const {
	if (f == OSystem::kFeatureCursorPalette ||
	        f == OSystem::kFeatureOpenGLForGame ||
	        f == OSystem::kFeatureAspectRatioCorrection) {
		return true;
	}
	return false;
}

void AndroidGraphics3dManager::setFeatureState(OSystem::Feature f, bool enable) {
	switch (f) {
	case OSystem::kFeatureCursorPalette:
		_use_mouse_palette = enable;
		if (!enable) {
			disableCursorPalette();
		}
		break;
	case OSystem::kFeatureFullscreenMode:
		_fullscreen = enable;
		updateScreenRect();
		break;
	case OSystem::kFeatureAspectRatioCorrection:
		_ar_correction = enable;
		updateScreenRect();
		break;
	default:
		break;
	}
}

bool AndroidGraphics3dManager::getFeatureState(OSystem::Feature f) const {
	switch (f) {
	case OSystem::kFeatureCursorPalette:
		return _use_mouse_palette;
	case OSystem::kFeatureFullscreenMode:
		return _fullscreen;
	case OSystem::kFeatureAspectRatioCorrection:
		return _ar_correction;
	default:
		return false;
	}
}

void AndroidGraphics3dManager::showOverlay() {
	ENTER();

	if (_show_overlay) {
		return;
	}

	JNI::setTouch3DMode(false);

	_show_overlay = true;
	_force_redraw = true;

	// If there is a game running capture the screen, so that it can be shown "below" the overlay.
	if (_overlay_background) {
		_overlay_background->release();

		if (g_engine) {
			GLint savedViewport[4];
			GLCALL(glGetIntegerv(GL_VIEWPORT, savedViewport));

			if (_frame_buffer) {
				_frame_buffer->detach();
			}

			GLCALL(glViewport(0, 0, JNI::egl_surface_width, JNI::egl_surface_height));
			_overlay_background->allocBuffer(_overlay_texture->width(), _overlay_texture->height());
			_overlay_background->setDrawRect(0, 0,
			                                 JNI::egl_surface_width, JNI::egl_surface_height);
			Graphics::Surface *background = _overlay_background->surface();
			GLCALL(glReadPixels(0, 0, background->w, background->h, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1,
			             background->getPixels()));

			// Restore game viewport
			GLCALL(glViewport(savedViewport[0], savedViewport[1], savedViewport[2], savedViewport[3]));

			if (_frame_buffer) {
				_frame_buffer->attach();
			}
		}
	}

	warpMouse(_overlay_texture->width() / 2, _overlay_texture->height() / 2);
}

void AndroidGraphics3dManager::hideOverlay() {
	ENTER();

	if (!_show_overlay) {
		return;
	}

	_show_overlay = false;

	_overlay_background->release();

	JNI::setTouch3DMode(true);

	warpMouse(_game_texture->width() / 2, _game_texture->height() / 2);

	// double buffered, flip twice
	clearScreen(kClearUpdate, 2);
}

void AndroidGraphics3dManager::clearOverlay() {
	ENTER();

	GLTHREADCHECK;

	_overlay_texture->fillBuffer(0);
}

void AndroidGraphics3dManager::grabOverlay(Graphics::Surface &surface) const {
	ENTER("%p", &surface);

	GLTHREADCHECK;

	const Graphics::Surface *overlaySurface = _overlay_texture->surface_const();

	assert(surface.w >= overlaySurface->w);
	assert(surface.h >= overlaySurface->h);
	assert(surface.format.bytesPerPixel == sizeof(uint16));
	assert(overlaySurface->format.bytesPerPixel == sizeof(uint16));

	const byte *src = (const byte *)overlaySurface->getPixels();
	byte *dst = (byte *)surface.getPixels();
	Graphics::copyBlit(dst, src, surface.pitch, overlaySurface->pitch,
	                   overlaySurface->w, overlaySurface->h, sizeof(uint16));
}

void AndroidGraphics3dManager::copyRectToOverlay(const void *buf, int pitch,
        int x, int y, int w, int h) {
	ENTER("%p, %d, %d, %d, %d, %d", buf, pitch, x, y, w, h);

	GLTHREADCHECK;

	_overlay_texture->updateBuffer(x, y, w, h, buf, pitch);
}

int16 AndroidGraphics3dManager::getOverlayHeight() const {
	return _overlay_texture->height();
}

int16 AndroidGraphics3dManager::getOverlayWidth() const {
	return _overlay_texture->width();
}

Graphics::PixelFormat AndroidGraphics3dManager::getOverlayFormat() const {
	return _overlay_texture->getPixelFormat();
}

int16 AndroidGraphics3dManager::getHeight() const {
	return _game_texture->height();
}

int16 AndroidGraphics3dManager::getWidth() const {
	return _game_texture->width();
}

void AndroidGraphics3dManager::setPalette(const byte *colors, uint start, uint num) {
	ENTER("%p, %u, %u", colors, start, num);

#ifdef USE_RGB_COLOR
	assert(_game_texture->hasPalette());
#endif

	GLTHREADCHECK;

	if (!_use_mouse_palette) {
		setCursorPaletteInternal(colors, start, num);
	}

	const Graphics::PixelFormat &pf = _game_texture->getPalettePixelFormat();
	// _game_texture is a GLESFakePalette565Texture so it's 16bits colors
	assert(pf.bpp() == sizeof(uint16) * 8);
	byte *p = _game_texture->palette() + start * sizeof(uint16);

	for (uint i = 0; i < num; ++i, colors += 3, p += sizeof(uint16)) {
		WRITE_UINT16(p, pf.RGBToColor(colors[0], colors[1], colors[2]));
	}
}

void AndroidGraphics3dManager::grabPalette(byte *colors, uint start, uint num) const {
	ENTER("%p, %u, %u", colors, start, num);

#ifdef USE_RGB_COLOR
	assert(_game_texture->hasPalette());
#endif

	GLTHREADCHECK;

	const Graphics::PixelFormat &pf = _game_texture->getPalettePixelFormat();
	// _game_texture is a GLESFakePalette565Texture so it's 16bits colors
	assert(pf.bpp() == sizeof(uint16) * 8);
	const byte *p = _game_texture->palette_const() + start * sizeof(uint16);

	for (uint i = 0; i < num; ++i, colors += 3, p += sizeof(uint16)) {
		pf.colorToRGB(READ_UINT16(p), colors[0], colors[1], colors[2]);
	}
}

Graphics::Surface *AndroidGraphics3dManager::lockScreen() {
	ENTER();

	GLTHREADCHECK;

	Graphics::Surface *surface = _game_texture->surface();
	assert(surface->getPixels());

	return surface;
}

void AndroidGraphics3dManager::unlockScreen() {
	ENTER();

	GLTHREADCHECK;

	assert(_game_texture->dirty());
}

void AndroidGraphics3dManager::fillScreen(uint32 col) {
	ENTER("%u", col);

	GLTHREADCHECK;

	_game_texture->fillBuffer(col);
}

void AndroidGraphics3dManager::copyRectToScreen(const void *buf, int pitch,
        int x, int y, int w, int h) {
	ENTER("%p, %d, %d, %d, %d, %d", buf, pitch, x, y, w, h);

	GLTHREADCHECK;

	_game_texture->updateBuffer(x, y, w, h, buf, pitch);
}

void AndroidGraphics3dManager::initSize(uint width, uint height,
                                        const Graphics::PixelFormat *format) {
	// resize game texture
	ENTER("%d, %d, %p", width, height, format);

	// We do only 3D with this manager and in 3D there is no format
	assert(format == nullptr);

	bool engineSupportsArbitraryResolutions = !g_engine ||
	        g_engine->hasFeature(Engine::kSupportsArbitraryResolutions);
	if (engineSupportsArbitraryResolutions) {
		width = JNI::egl_surface_width;
		height = JNI::egl_surface_height;
	}

	GLTHREADCHECK;

	_game_texture->allocBuffer(width, height);

	delete _frame_buffer;
	_frame_buffer = new OpenGL::FrameBuffer(_game_texture->getTextureName(),
	                                        _game_texture->width(), _game_texture->height(),
	                                        _game_texture->texWidth(), _game_texture->texHeight());
	_frame_buffer->attach();

	updateScreenRect();

	// 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_palette->allocBuffer(20, 20);

	clearScreen(kClear);

	_game_texture->setGameTexture();
}

int AndroidGraphics3dManager::getScreenChangeID() const {
	return _screenChangeID;
}

bool AndroidGraphics3dManager::showMouse(bool visible) {
	ENTER("%d", visible);

	_show_mouse = visible;

	return true;
}

void AndroidGraphics3dManager::warpMouse(int x, int y) {
	ENTER("%d, %d", x, y);

	Common::Event e;

	e.type = Common::EVENT_MOUSEMOVE;
	e.mouse.x = x;
	e.mouse.y = y;

	clipMouse(e.mouse);

	setMousePosition(e.mouse.x, e.mouse.y);

	dynamic_cast<OSystem_Android *>(g_system)->pushEvent(e);
}

void AndroidGraphics3dManager::setMouseCursor(const void *buf, uint w, uint h,
        int hotspotX, int hotspotY,
        uint32 keycolor, bool dontScale,
        const Graphics::PixelFormat *format) {
	ENTER("%p, %u, %u, %d, %d, %u, %d, %p", buf, w, h, hotspotX, hotspotY,
	      keycolor, dontScale, format);

	GLTHREADCHECK;

#ifdef USE_RGB_COLOR
	if (format && format->bytesPerPixel > 1) {
		if (_mouse_texture != _mouse_texture_rgb) {
			LOGD("switching to rgb mouse cursor");

			assert(!_mouse_texture_rgb);
			_mouse_texture_rgb = new GLES5551Texture();
			_mouse_texture_rgb->setLinearFilter(_graphicsMode == 1);
		}

		_mouse_texture = _mouse_texture_rgb;
	} else {
		if (_mouse_texture != _mouse_texture_palette) {
			LOGD("switching to paletted mouse cursor");
		}

		_mouse_texture = _mouse_texture_palette;

		delete _mouse_texture_rgb;
		_mouse_texture_rgb = 0;
	}
#endif

	_mouse_texture->allocBuffer(w, h);

	if (_mouse_texture == _mouse_texture_palette) {
		assert(keycolor < 256);

		const Graphics::PixelFormat &pf = _mouse_texture_palette->getPalettePixelFormat();
		// _mouse_texture_palette is a GLESFakePalette565Texture so it's 16bits colors
		assert(pf.bpp() == sizeof(uint16) * 8);
		byte *p = _mouse_texture_palette->palette() + _mouse_keycolor * sizeof(uint16);
		WRITE_UINT16(p, READ_UINT16(p) | 1);

		_mouse_keycolor = keycolor;

		p = _mouse_texture_palette->palette() + _mouse_keycolor * sizeof(uint16);
		WRITE_UINT16(p, READ_UINT16(p) & ~1);
	}

	if (w == 0 || h == 0) {
		return;
	}

	if (_mouse_texture == _mouse_texture_palette) {
		_mouse_texture->updateBuffer(0, 0, w, h, buf, w);
	} else {
		uint16 pitch = _mouse_texture->pitch();

		byte *tmp = new byte[pitch * h];

		// meh, a n-bit cursor without alpha bits... this is so silly
		if (!crossBlit(tmp, (const byte *)buf, pitch, w * format->bytesPerPixel, w, h,
		               _mouse_texture->getPixelFormat(),
		               *format)) {
			LOGE("crossblit failed");

			delete[] tmp;

			_mouse_texture->allocBuffer(0, 0);

			return;
		}

		if (format->bytesPerPixel == 2) {
			const uint16 *s = (const uint16 *)buf;
			uint16 *d = (uint16 *)tmp;
			for (uint16 y = 0; y < h; ++y, d += pitch / 2 - w)
				for (uint16 x = 0; x < w; ++x, d++)
					if (*s++ == (keycolor & 0xffff)) {
						*d = 0;
					}
		} else if (format->bytesPerPixel == 4) {
			const uint32 *s = (const uint32 *)buf;
			uint16 *d = (uint16 *)tmp;
			for (uint16 y = 0; y < h; ++y, d += pitch / 2 - w)
				for (uint16 x = 0; x < w; ++x, d++)
					if (*s++ == (keycolor & 0xffff)) {
						*d = 0;
					}
		} else {
			error("AndroidGraphics3dManager::setMouseCursor: invalid bytesPerPixel %d", format->bytesPerPixel);
		}

		_mouse_texture->updateBuffer(0, 0, w, h, tmp, pitch);

		delete[] tmp;
	}

	_mouse_hotspot = Common::Point(hotspotX, hotspotY);
	// TODO: Adapt to the new "do not scale" cursor logic.
	_mouse_targetscale = 1;
}

void AndroidGraphics3dManager::setCursorPaletteInternal(const byte *colors,
        uint start, uint num) {
	// _mouse_texture_palette is a GLESFakePalette565Texture so it's 16bits colors
	const Graphics::PixelFormat &pf =
		_mouse_texture_palette->getPalettePixelFormat();
	assert(pf.bpp() == sizeof(uint16) * 8);
	byte *p = _mouse_texture_palette->palette() + start * sizeof(uint16);

	for (uint i = 0; i < num; ++i, colors += 3, p += sizeof(uint16)) {
		WRITE_UINT16(p, pf.RGBToColor(colors[0], colors[1], colors[2]));
	}

	p = _mouse_texture_palette->palette() + _mouse_keycolor * sizeof(uint16);
	WRITE_UINT16(p, READ_UINT16(p) & ~1);
}

void AndroidGraphics3dManager::setCursorPalette(const byte *colors,
        uint start, uint num) {
	ENTER("%p, %u, %u", colors, start, num);

	GLTHREADCHECK;

	if (!_mouse_texture->hasPalette()) {
		LOGD("switching to paletted mouse cursor");

		_mouse_texture = _mouse_texture_palette;

		delete _mouse_texture_rgb;
		_mouse_texture_rgb = 0;
	}

	setCursorPaletteInternal(colors, start, num);
	_use_mouse_palette = true;
}

void AndroidGraphics3dManager::disableCursorPalette() {
	// when disabling the cursor palette, and we're running a clut8 game,
	// it expects the game palette to be used for the cursor
	if (_game_texture->hasPalette()) {
		// _game_texture and _mouse_texture_palette are GLESFakePalette565Texture so it's 16bits colors
		const Graphics::PixelFormat &pf_src =
		    _game_texture->getPalettePixelFormat();
		const Graphics::PixelFormat &pf_dst =
		    _mouse_texture_palette->getPalettePixelFormat();
		assert(pf_src.bpp() == sizeof(uint16) * 8);
		assert(pf_dst.bpp() == sizeof(uint16) * 8);

		const byte *src = _game_texture->palette_const();
		byte *dst = _mouse_texture_palette->palette();

		uint8 r, g, b;

		for (uint i = 0; i < 256; ++i, src += sizeof(uint16), dst += sizeof(uint16)) {
			pf_src.colorToRGB(READ_UINT16(src), r, g, b);
			WRITE_UINT16(dst, pf_dst.RGBToColor(r, g, b));
		}

		byte *p = _mouse_texture_palette->palette() + _mouse_keycolor * sizeof(uint16);
		WRITE_UINT16(p, READ_UINT16(p) & ~1);
	}
}

bool AndroidGraphics3dManager::lockMouse(bool lock) {
	_show_mouse = lock;
	return true;
}

void AndroidGraphics3dManager::clipMouse(Common::Point &p) const {
	const GLESBaseTexture *tex = getActiveTexture();

	p.x = CLIP(p.x, tex->getDrawRect().left, tex->getDrawRect().right);
	p.y = CLIP(p.y, tex->getDrawRect().top, tex->getDrawRect().bottom);
}

#ifdef USE_RGB_COLOR
Graphics::PixelFormat AndroidGraphics3dManager::getScreenFormat() const {
	return _game_texture->getPixelFormat();
}

Common::List<Graphics::PixelFormat> AndroidGraphics3dManager::getSupportedFormats() const {
	Common::List<Graphics::PixelFormat> res;
	res.push_back(GLES565Texture::pixelFormat());
	res.push_back(GLES5551Texture::pixelFormat());
	res.push_back(GLES4444Texture::pixelFormat());
	res.push_back(Graphics::PixelFormat::createFormatCLUT8());

	return res;
}
#endif

void AndroidGraphics3dManager::updateScreenRect() {
	Common::Rect rect(0, 0, JNI::egl_surface_width, JNI::egl_surface_height);

	_overlay_texture->setDrawRect(rect);

	// Clear the overlay background so it is not displayed distorted while resizing
	_overlay_background->release();

	uint16 w = _game_texture->width();
	uint16 h = _game_texture->height();

	if (w && h && _ar_correction) {

		float dpi[2];
		JNI::getDPI(dpi);

		float screen_ar;
		if (dpi[0] != 0.0 && dpi[1] != 0.0) {
			// horizontal orientation
			screen_ar = (dpi[1] * JNI::egl_surface_width) /
			            (dpi[0] * JNI::egl_surface_height);
		} else {
			screen_ar = float(JNI::egl_surface_width) / float(JNI::egl_surface_height);
		}

		float game_ar = float(w) / float(h);

		if (screen_ar > game_ar) {
			rect.setWidth(round(JNI::egl_surface_height * game_ar));
			rect.moveTo((JNI::egl_surface_width - rect.width()) / 2, 0);
		} else {
			rect.setHeight(round(JNI::egl_surface_width / game_ar));
			rect.moveTo((JNI::egl_surface_height - rect.height()) / 2, 0);
		}
	}

	_game_texture->setDrawRect(rect);
}

const GLESBaseTexture *AndroidGraphics3dManager::getActiveTexture() const {
	if (_show_overlay) {
		return _overlay_texture;
	} else {
		return _game_texture;
	}
}

void AndroidGraphics3dManager::initOverlay() {
	// minimum of 320x200
	// (surface can get smaller when opening the virtual keyboard on *QVGA*)
	int overlay_width = MAX(JNI::egl_surface_width, 320);
	int overlay_height = MAX(JNI::egl_surface_height, 200);

	LOGI("overlay size is %ux%u", overlay_width, overlay_height);

	_overlay_texture->allocBuffer(overlay_width, overlay_height);
	_overlay_texture->setDrawRect(0, 0,
	                              JNI::egl_surface_width, JNI::egl_surface_height);
}

void AndroidGraphics3dManager::clearScreen(FixupType type, byte count) {
	assert(count > 0);

	bool sm = _show_mouse;
	_show_mouse = false;

	CONTEXT_SAVE_STATE(GL_SCISSOR_TEST);
	CONTEXT_SET_DISABLE(GL_SCISSOR_TEST);

	for (byte i = 0; i < count; ++i) {
		// clear screen
		GLCALL(glClearColor(0, 0, 0, 1 << 16));
		GLCALL(glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT));

		switch (type) {
		case kClear:
			break;

		case kClearSwap:
			JNI::swapBuffers();
			break;

		case kClearUpdate:
			_force_redraw = true;
			updateScreen();
			break;
		}
	}

	CONTEXT_RESET_DISABLE(GL_SCISSOR_TEST);

	_show_mouse = sm;
	_force_redraw = true;
}

float AndroidGraphics3dManager::getHiDPIScreenFactor() const {
	// TODO: Use JNI to get DisplayMetrics.density, which according to the documentation
	// seems to be what we want.
	// "On a medium-density screen, DisplayMetrics.density equals 1.0; on a high-density
	//  screen it equals 1.5; on an extra-high-density screen, it equals 2.0; and on a
	//  low-density screen, it equals 0.75. This figure is the factor by which you should
	//  multiply the dp units in order to get the actual pixel count for the current screen."

	return 2.f;
}

AndroidCommonGraphics::State AndroidGraphics3dManager::getState() const {
	AndroidCommonGraphics::State state;

	state.screenWidth   = getWidth();
	state.screenHeight  = getHeight();
	state.aspectRatio   = getFeatureState(OSystem::kFeatureAspectRatioCorrection);
	state.fullscreen    = getFeatureState(OSystem::kFeatureFullscreenMode);
	state.cursorPalette = getFeatureState(OSystem::kFeatureCursorPalette);
#ifdef USE_RGB_COLOR
	state.pixelFormat   = getScreenFormat();
#endif
	return state;
}

bool AndroidGraphics3dManager::setState(const AndroidCommonGraphics::State &state) {
	// In 3d we don't have a pixel format so we ignore it
	initSize(state.screenWidth, state.screenHeight, nullptr);
	setFeatureState(OSystem::kFeatureAspectRatioCorrection, state.aspectRatio);
	setFeatureState(OSystem::kFeatureFullscreenMode, state.fullscreen);
	setFeatureState(OSystem::kFeatureCursorPalette, state.cursorPalette);

	return true;
}