Initial commit

engines/wintermute/base/gfx/tinygl/base_render_tinygl.h

@@ -0,0 +1,176 @@
+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef WINTERMUTE_BASE_RENDER_TINYGL_H
+#define WINTERMUTE_BASE_RENDER_TINYGL_H
+
+#include "engines/wintermute/base/gfx/base_renderer3d.h"
+#include "engines/wintermute/dctypes.h"
+
+#include "graphics/transform_struct.h"
+#include "graphics/tinygl/tinygl.h"
+
+#if defined(USE_TINYGL)
+
+namespace Wintermute {
+
+class BaseSurfaceTinyGL;
+
+class BaseRenderTinyGL : public BaseRenderer3D {
+	friend class BaseSurfaceTinyGL;
+	friend class Mesh3DSTinyGL;
+	friend class XMeshTinyGL;
+	friend class ShadowVolumeTinyGL;
+
+	struct SpriteVertex {
+		float x;
+		float y;
+		float z;
+		float u;
+		float v;
+		float r;
+		float g;
+		float b;
+		float a;
+	};
+
+	struct RectangleVertex {
+		float x;
+		float y;
+		float z;
+	};
+
+	struct SimpleShadowVertex {
+		float nx;
+		float ny;
+		float nz;
+		float x;
+		float y;
+		float z;
+		float u;
+		float v;
+	};
+
+public:
+	BaseRenderTinyGL(BaseGame *inGame = nullptr);
+	~BaseRenderTinyGL() override;
+
+	bool invalidateTexture(BaseSurface *texture) override;
+
+	bool invalidateDeviceObjects() override;
+	bool restoreDeviceObjects() override;
+
+	bool resetDevice() override;
+
+	void setSpriteBlendMode(Graphics::TSpriteBlendMode blendMode, bool forceChange = false) override;
+
+	void setAmbientLightRenderState() override;
+
+	int getMaxActiveLights() override;
+	void lightEnable(int index, bool enable) override;
+	void setLightParameters(int index, const DXVector3 &position, const DXVector3 &direction, const DXVector4 &diffuse, bool spotlight) override;
+
+	void enableCulling() override;
+	void disableCulling() override;
+
+	bool enableShadows() override;
+	bool disableShadows() override;
+	bool shadowVolumeSupported() override;
+
+	BaseImage *takeScreenshot(int newWidth = 0, int newHeight = 0) override;
+	bool fadeToColor(byte r, byte g, byte b, byte a) override;
+
+	bool flip() override;
+	bool clear() override;
+
+	bool setViewport(int left, int top, int right, int bottom) override;
+	bool drawLine(int x1, int y1, int x2, int y2, uint32 color) override;
+	bool fillRect(int x, int y, int w, int h, uint32 color) override;
+
+	DXMatrix *buildMatrix(DXMatrix* out, const DXVector2 *centre, const DXVector2 *scaling, float angle);
+	void transformVertices(struct SpriteVertex *vertices, const DXVector2 *centre, const DXVector2 *scaling, float angle);
+
+	bool setProjection() override;
+	bool setProjection2D();
+	bool setWorldTransform(const DXMatrix &transform) override;
+	bool setViewTransform(const DXMatrix &transform) override;
+	bool setProjectionTransform(const DXMatrix &transform) override;
+
+	bool initRenderer(int width, int height, bool windowed) override;
+	bool setup2D(bool force = false) override;
+	bool setup3D(Camera3D *camera, bool force = false) override;
+
+	Common::String getName() const override {
+		return "TinyGL software renderer";
+	};
+	bool displayDebugInfo() override {
+		return STATUS_FAILED;
+	};
+	bool drawShaderQuad() override {
+		return STATUS_FAILED;
+	}
+
+	float getScaleRatioX() const override {
+		return 1.0f;
+	}
+	float getScaleRatioY() const override {
+		return 1.0f;
+	}
+
+	BaseSurface *createSurface() override;
+
+	bool startSpriteBatch() override;
+	bool endSpriteBatch() override;
+	bool commitSpriteBatch() override;
+
+	bool drawSpriteEx(BaseSurface *texture, const Common::Rect32 &rect, const DXVector2 &pos, const DXVector2 &rot, const DXVector2 &scale,
+	                  float angle, uint32 color, bool alphaDisable, Graphics::TSpriteBlendMode blendMode, bool mirrorX, bool mirrorY) override;
+
+	void renderSceneGeometry(const BaseArray<AdWalkplane *> &planes, const BaseArray<AdBlock *> &blocks,
+	                         const BaseArray<AdGeneric *> &generics, const BaseArray<Light3D *> &lights, Camera3D *camera) override;
+	void renderShadowGeometry(const BaseArray<AdWalkplane *> &planes, const BaseArray<AdBlock *> &blocks, const BaseArray<AdGeneric *> &generics, Camera3D *camera) override;
+
+	Mesh3DS *createMesh3DS() override;
+	XMesh *createXMesh() override;
+	ShadowVolume *createShadowVolume() override;
+
+	bool setViewport3D(DXViewport *viewport) override;
+
+	void postfilter() override;
+	void setPostfilter(PostFilter postFilter) override { _postFilterMode = postFilter; };
+
+private:
+	bool setupLines();
+	void displaySimpleShadow(BaseObject *object) override;
+
+	Graphics::TSpriteBlendMode _blendMode;
+	SimpleShadowVertex _simpleShadow[4];
+	Common::Array<DXVector4> _lightPositions;
+	Common::Array<DXVector3> _lightDirections;
+	//TGLuint _postfilterTexture;
+	bool _shadowVolumesSupported;
+};
+
+} // wintermute namespace
+
+#endif // defined(USE_TINYGL)
+
+#endif

engines/wintermute/base/gfx/tinygl/base_surface_tinygl.cpp

@@ -0,0 +1,462 @@
+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "common/algorithm.h"
+
+#include "graphics/transform_tools.h"
+
+#include "engines/wintermute/base/base_game.h"
+#include "engines/wintermute/base/base_engine.h"
+#include "engines/wintermute/base/gfx/base_image.h"
+
+#if defined(USE_TINYGL)
+
+#include "engines/wintermute/base/gfx/3dutils.h"
+#include "engines/wintermute/base/gfx/tinygl/base_surface_tinygl.h"
+#include "engines/wintermute/base/gfx/tinygl/base_render_tinygl.h"
+
+namespace Wintermute {
+
+BaseSurfaceTinyGL::BaseSurfaceTinyGL(BaseGame *game, BaseRenderer3D *renderer)
+: BaseSurface(game), _tex(0), _renderer(renderer), _imageData(nullptr), _maskData(nullptr), _pixelOpReady(false), _surfaceModified(false), _texture2D(true) {
+	_blitImage = tglGenBlitImage();
+}
+
+BaseSurfaceTinyGL::~BaseSurfaceTinyGL() {
+	_renderer->invalidateTexture(this);
+	if (_tex) {
+		tglDeleteTextures(1, &_tex);
+		_tex = 0;
+	}
+
+	if (_imageData) {
+		_imageData->free();
+		delete _imageData;
+		_imageData = nullptr;
+	}
+
+	if (_maskData) {
+		_maskData->free();
+		delete _maskData;
+		_maskData = nullptr;
+	}
+
+	tglDeleteBlitImage(_blitImage);
+}
+
+bool BaseSurfaceTinyGL::invalidate() {
+	_renderer->invalidateTexture(this);
+	if (_tex) {
+		tglDeleteTextures(1, &_tex);
+		_tex = 0;
+	}
+
+	if (_imageData) {
+		_imageData->free();
+		delete _imageData;
+		_imageData = nullptr;
+	}
+
+	_valid = false;
+	_surfaceModified = false;
+	return true;
+}
+
+bool BaseSurfaceTinyGL::prepareToDraw() {
+	_lastUsedTime = _game->_liveTimer;
+
+	if (!_valid) {
+		loadImage();
+	}
+
+	return true;
+}
+
+bool BaseSurfaceTinyGL::displayTransZoom(int x, int y, Common::Rect32 rect, float zoomX, float zoomY, uint32 alpha, Graphics::TSpriteBlendMode blendMode, bool mirrorX, bool mirrorY) {
+	prepareToDraw();
+
+	_renderer->drawSprite(dynamic_cast<BaseSurface *>(this), rect, zoomX, zoomY, DXVector2(x, y), alpha, false, blendMode, mirrorX, mirrorY);
+	return true;
+}
+
+bool BaseSurfaceTinyGL::displayTrans(int x, int y, Common::Rect32 rect, uint32 alpha, Graphics::TSpriteBlendMode blendMode, bool mirrorX, bool mirrorY, int offsetX, int offsetY) {
+	prepareToDraw();
+
+	_renderer->drawSprite(dynamic_cast<BaseSurface *>(this), rect, 100, 100, DXVector2(x + offsetX, y + offsetY), alpha, false, blendMode, mirrorX, mirrorY);
+	return true;
+}
+
+bool BaseSurfaceTinyGL::display(int x, int y, Common::Rect32 rect, Graphics::TSpriteBlendMode blendMode, bool mirrorX, bool mirrorY) {
+	prepareToDraw();
+
+	_renderer->drawSprite(dynamic_cast<BaseSurface *>(this), rect, 100, 100, DXVector2(x, y), 0xFFFFFFFF, true, blendMode, mirrorX, mirrorY);
+	return true;
+}
+
+bool BaseSurfaceTinyGL::displayTransRotate(int x, int y, float rotate, int32 hotspotX, int32 hotspotY, Common::Rect32 rect, float zoomX, float zoomY, uint32 alpha, Graphics::TSpriteBlendMode blendMode, bool mirrorX, bool mirrorY) {
+	prepareToDraw();
+
+	x -= hotspotX;
+	y -= hotspotY;
+
+	DXVector2 position(x, y);
+	DXVector2 rotation;
+	rotation._x = x + hotspotX * (zoomX / 100.0f);
+	rotation._y = y + hotspotY * (zoomY / 100.0f);
+	DXVector2 scale(zoomX / 100.0f, zoomY / 100.0f);
+	float angle = degToRad(rotate);
+
+	_renderer->drawSpriteEx(dynamic_cast<BaseSurface *>(this), rect, position, rotation, scale, angle, alpha, false, blendMode, mirrorX, mirrorY);
+	return true;
+}
+
+bool BaseSurfaceTinyGL::displayTiled(int x, int y, Common::Rect32 rect, int numTimesX, int numTimesY) {
+	prepareToDraw();
+
+	DXVector2 scale(numTimesX, numTimesY);
+	_renderer->drawSpriteEx(dynamic_cast<BaseSurface *>(this), rect, DXVector2(x, y), DXVector2(0, 0), scale, 0, 0xFFFFFFFF, false, Graphics::BLEND_NORMAL, false, false);
+	return true;
+}
+
+bool BaseSurfaceTinyGL::create(const char *filename, bool texture2D, bool defaultCK, byte ckRed, byte ckGreen, byte ckBlue, int lifeTime, bool keepLoaded) {
+	if (defaultCK) {
+		ckRed = 255;
+		ckGreen = 0;
+		ckBlue = 255;
+	}
+
+	_texture2D = texture2D;
+
+	Common::String surfacefilename = filename;
+	BaseImage img = BaseImage();
+	if (!img.getImageInfo(surfacefilename, _width, _height)) {
+		return false;
+	}
+
+	if (lifeTime != -1 && _lifeTime == 0) {
+		_valid = false;
+	}
+
+	_ckDefault = defaultCK;
+	_ckRed = ckRed;
+	_ckGreen = ckGreen;
+	_ckBlue = ckBlue;
+
+	if (!_filename || scumm_stricmp(_filename, filename) != 0) {
+		setFilename(filename);
+	}
+
+	if (_lifeTime == 0 || lifeTime == -1 || lifeTime > _lifeTime) {
+		_lifeTime = lifeTime;
+	}
+
+	_keepLoaded = keepLoaded;
+	if (_keepLoaded) {
+		_lifeTime = -1;
+	}
+
+	return true;
+}
+
+bool BaseSurfaceTinyGL::loadImage() {
+	if (!_filename || !_filename[0]) {
+		return false;
+	}
+	Common::String filename = _filename;
+
+	BaseImage img = BaseImage();
+	if (!img.loadFile(filename)) {
+		return false;
+	}
+
+	if (img.getSurface()->format.bytesPerPixel == 1 && img.getPalette() == nullptr) {
+		return false;
+	}
+
+	bool needsColorKey = false;
+	bool replaceAlpha = true;
+
+	if (_imageData) {
+		_imageData->free();
+		delete _imageData;
+		_imageData = nullptr;
+	}
+
+	_imageData = img.getSurface()->convertTo(Graphics::PixelFormat::createFormatRGBA32(), img.getPalette(), img.getPaletteCount());
+
+	if (filename.matchString("savegame:*g", true)) {
+		uint8 r, g, b, a;
+		for (int x = 0; x < _imageData->w; x++) {
+			for (int y = 0; y < _imageData->h; y++) {
+				_imageData->format.colorToARGB(_imageData->getPixel(x, y), a, r, g, b);
+				uint8 grey = (uint8)((0.2126f * r + 0.7152f * g + 0.0722f * b) + 0.5f);
+				_imageData->setPixel(x, y, _imageData->format.ARGBToColor(a, grey, grey, grey));
+			}
+		}
+	}
+
+	if (filename.hasSuffix(".bmp")) {
+		// Ignores alpha channel for BMPs
+		needsColorKey = true;
+	} else if (filename.hasSuffix(".jpg")) {
+		// Ignores alpha channel for JPEGs
+		needsColorKey = true;
+	} else if (BaseEngine::instance().getTargetExecutable() < WME_LITE) {
+		// WME 1.x always use colorkey, even for images with transparency
+		needsColorKey = true;
+		replaceAlpha = false;
+	} else if (BaseEngine::instance().isFoxTail()) {
+		// FoxTail does not use colorkey
+		needsColorKey = false;
+	} else if (img.getSurface()->format.aBits() == 0) {
+		// generic WME Lite does not use colorkey for non-BMPs with transparency
+		needsColorKey = true;
+	}
+
+	if (needsColorKey) {
+		// We set the pixel color to transparent black,
+		// like D3DX, if it matches the color key.
+		_imageData->applyColorKey(_ckRed, _ckGreen, _ckBlue, replaceAlpha, 0, 0, 0);
+	}
+
+	// Bug #6572 WME: Rosemary - Sprite flaw on going upwards
+	// Some Rosemary sprites have non-fully transparent pixels
+	// In original WME it wasn't seen because sprites were downscaled
+	// Let's set alpha to 0 if it is smaller then some treshold
+	if (BaseEngine::instance().getGameId() == "rosemary" && filename.hasPrefix("actors") && _imageData->format.bytesPerPixel == 4) {
+		uint32 mask = _imageData->format.ARGBToColor(255, 0, 0, 0);
+		uint32 treshold = _imageData->format.ARGBToColor(16, 0, 0, 0);
+		uint32 blank = _imageData->format.ARGBToColor(0, 0, 0, 0);
+
+		for (int x = 0; x < _imageData->w; x++) {
+			for (int y = 0; y < _imageData->h; y++) {
+				uint32 pixel = _imageData->getPixel(x, y);
+				if ((pixel & mask) > blank && (pixel & mask) < treshold) {
+					_imageData->setPixel(x, y, blank);
+				}
+			}
+		}
+	}
+
+	putSurface(*_imageData);
+
+	/* TODO: Delete _imageData if we no longer need to access the pixel data? */
+
+	_valid = true;
+
+	return true;
+}
+
+bool BaseSurfaceTinyGL::create(int width, int height) {
+	_width = width;
+	_height = height;
+
+	_valid = true;
+	return true;
+}
+
+bool BaseSurfaceTinyGL::putSurface(const Graphics::Surface &surface, bool hasAlpha) {
+	if (!_imageData) {
+		_imageData = new Graphics::Surface();
+	}
+
+	if (_imageData && _imageData != &surface) {
+		_imageData->copyFrom(surface);
+		writeAlpha(_imageData, _maskData);
+	}
+
+	_width = surface.w;
+	_height = surface.h;
+
+	if (_texture2D) {
+		tglUploadBlitImage(_blitImage, *_imageData, 0, false);
+	} else {
+		if (!_valid) {
+			tglGenTextures(1, &_tex);
+		}
+		_texWidth = Common::nextHigher2(_width);
+		_texHeight = Common::nextHigher2(_height);
+		tglBindTexture(TGL_TEXTURE_2D, _tex);
+		tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_WRAP_S, TGL_REPEAT);
+		tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_WRAP_T, TGL_REPEAT);
+		tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_MIN_FILTER, TGL_LINEAR);
+		tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_MAG_FILTER, TGL_LINEAR);
+		tglTexImage2D(TGL_TEXTURE_2D, 0, TGL_RGBA, _width, _height, 0, TGL_RGBA, TGL_UNSIGNED_BYTE, _imageData->getPixels());
+		tglBindTexture(TGL_TEXTURE_2D, 0);
+	}
+	_valid = true;
+
+	return true;
+}
+
+bool BaseSurfaceTinyGL::putPixel(int x, int y, byte r, byte g, byte b, byte a) {
+	if (!_pixelOpReady) {
+		return false;
+	}
+
+	if (x < 0 || y < 0 || x >= _width || y >= _height) {
+		return false;
+	}
+
+	if (_imageData == nullptr) {
+		return false;
+	}
+
+	_imageData->setPixel(x, y, _imageData->format.ARGBToColor(a, r, g, b));
+
+	_surfaceModified = true;
+
+	return true;
+}
+
+bool BaseSurfaceTinyGL::getPixel(int x, int y, byte *r, byte *g, byte *b, byte *a) const {
+	if (!_pixelOpReady) {
+		return false;
+	}
+
+	if (x < 0 || y < 0 || x >= _width || y >= _height) {
+		return false;
+	}
+
+	if (_imageData == nullptr) {
+		return false;
+	}
+
+	uint8 alpha, red, green, blue;
+	_imageData->format.colorToARGB(_imageData->getPixel(x, y), alpha, red, green, blue);
+	*r = red;
+	*g = green;
+	*b = blue;
+	*a = alpha;
+	return true;
+}
+
+bool BaseSurfaceTinyGL::startPixelOp() {
+	if (!prepareToDraw())
+		return false;
+	_pixelOpReady = true;
+	return true;
+}
+
+bool BaseSurfaceTinyGL::endPixelOp() {
+	_pixelOpReady = false;
+	if (_surfaceModified) {
+		if (_texture2D) {
+			tglUploadBlitImage(_blitImage, *_imageData, 0, false);
+		} else {
+			tglBindTexture(TGL_TEXTURE_2D, _tex);
+			tglTexImage2D(TGL_TEXTURE_2D, 0, TGL_RGBA, _width, _height, 0, TGL_RGBA, TGL_UNSIGNED_BYTE, _imageData->getPixels());
+			tglBindTexture(TGL_TEXTURE_2D, 0);
+		}
+		_surfaceModified = false;
+	}
+	return true;
+}
+
+bool BaseSurfaceTinyGL::isTransparentAtLite(int x, int y) const {
+	if (!_pixelOpReady) {
+		return false;
+	}
+
+	if (x < 0 || y < 0 || x >= _width || y >= _height) {
+		return false;
+	}
+
+	if (_imageData == nullptr) {
+		return false;
+	}
+
+	uint8 a, r, g, b;
+	_imageData->format.colorToARGB(_imageData->getPixel(x, y), a, r, g, b);
+	// Keep behavior in sync with the 2D renderer, which implements the WME Lite logic
+	// by comparing alpha against 128.
+	// This differs from the original WME1 sources, where alpha is compared against 0.
+	// The likely reason for this discrepancy is a difference in how bitmaps are
+	// converted after loading.
+	if (a <= 128) {
+		return true;
+	} else {
+		return false;
+	}
+}
+
+void BaseSurfaceTinyGL::setTexture() {
+	prepareToDraw();
+
+	if (!_texture2D) {
+		tglBindTexture(TGL_TEXTURE_2D, _tex);
+	}
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool BaseSurfaceTinyGL::setAlphaImage(const char *filename) {
+	BaseImage *alphaImage = new BaseImage();
+	if (!alphaImage->loadFile(filename)) {
+		delete alphaImage;
+		return false;
+	}
+
+	if (_maskData) {
+		_maskData->free();
+		delete _maskData;
+		_maskData = nullptr;
+	}
+
+	Graphics::AlphaType type = alphaImage->getSurface()->detectAlpha();
+	if (type != Graphics::ALPHA_OPAQUE) {
+		_maskData = alphaImage->getSurface()->convertTo(Graphics::PixelFormat::createFormatRGBA32());
+	}
+
+	delete alphaImage;
+
+	return true;
+}
+
+void BaseSurfaceTinyGL::writeAlpha(Graphics::Surface *surface, const Graphics::Surface *mask) {
+	if (mask && surface->w == mask->w && surface->h == mask->h) {
+		assert(mask->pitch == mask->w * 4);
+		assert(mask->format.bytesPerPixel == 4);
+		assert(surface->pitch == surface->w * 4);
+		assert(surface->format.bytesPerPixel == 4);
+		const byte *alphaData = (const byte *)mask->getPixels();
+#ifdef SCUMM_LITTLE_ENDIAN
+		int alphaPlace = (mask->format.aShift / 8);
+#else
+		int alphaPlace = 3 - (mask->format.aShift / 8);
+#endif
+		alphaData += alphaPlace;
+		byte *imgData = (byte *)surface->getPixels();
+#ifdef SCUMM_LITTLE_ENDIAN
+		imgData += (surface->format.aShift / 8);
+#else
+		imgData += 3 - (surface->format.aShift / 8);
+#endif
+		for (int i = 0; i < surface->w * surface->h; i++) {
+			*imgData = *alphaData;
+			alphaData += 4;
+			imgData += 4;
+		}
+	}
+}
+
+} // End of namespace Wintermute
+
+#endif // defined(USE_TINYGL)

engines/wintermute/base/gfx/tinygl/base_surface_tinygl.h

@@ -0,0 +1,101 @@
+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef WINTERMUTE_BASE_SURFACE_TINYGL_H
+#define WINTERMUTE_BASE_SURFACE_TINYGL_H
+
+#include "engines/wintermute/base/gfx/base_surface.h"
+
+#if defined(USE_TINYGL)
+
+#include "graphics/tinygl/tinygl.h"
+
+namespace Wintermute {
+
+class BaseGame;
+class BaseRenderer3D;
+
+class BaseSurfaceTinyGL : public BaseSurface {
+public:
+	BaseSurfaceTinyGL(BaseGame *game, BaseRenderer3D *renderer);
+	~BaseSurfaceTinyGL();
+
+	bool invalidate() override;
+	bool prepareToDraw() override;
+
+	bool displayTransRotate(int x, int y, float rotate, int32 hotspotX, int32 hotspotY, Common::Rect32 rect, float zoomX, float zoomY, uint32 alpha = 0xFFFFFFFF, Graphics::TSpriteBlendMode blendMode = Graphics::BLEND_NORMAL, bool mirrorX = false, bool mirrorY = false) override;
+	bool displayTransZoom(int x, int y, Common::Rect32 rect, float zoomX, float zoomY, uint32 alpha = 0xFFFFFFFF, Graphics::TSpriteBlendMode blendMode = Graphics::BLEND_NORMAL, bool mirrorX = false, bool mirrorY = false) override;
+	bool displayTrans(int x, int y, Common::Rect32 rect, uint32 alpha = 0xFFFFFFFF, Graphics::TSpriteBlendMode blendMode = Graphics::BLEND_NORMAL, bool mirrorX = false, bool mirrorY = false, int offsetX = 0, int offsetY = 0) override;
+	bool display(int x, int y, Common::Rect32 rect, Graphics::TSpriteBlendMode blendMode = Graphics::BLEND_NORMAL, bool mirrorX = false, bool mirrorY = false) override;
+	bool displayTiled(int x, int y, Common::Rect32 rect, int numTimesX, int numTimesY) override;
+	bool create(const char *filename, bool texture2D, bool defaultCK, byte ckRed, byte ckGreen, byte ckBlue, int lifeTime = -1, bool keepLoaded = false) override;
+	bool create(int width, int height) override;
+	bool setAlphaImage(const char *filename) override;
+	bool putSurface(const Graphics::Surface &surface, bool hasAlpha = false) override;
+	bool putPixel(int x, int y, byte r, byte g, byte b, byte a) override;
+	bool getPixel(int x, int y, byte *r, byte *g, byte *b, byte *a = nullptr) const override;
+	bool startPixelOp() override;
+	bool endPixelOp() override;
+	bool isTransparentAtLite(int x, int y) const override;
+
+	void setTexture();
+
+	int getWidth() override {
+		return _width;
+	}
+
+	int getHeight() override {
+		return _height;
+	}
+
+	uint getGLTextureWidth() const {
+		return _texWidth;
+	}
+
+	uint getGLTextureHeight() const {
+		return _texHeight;
+	}
+
+	TinyGL::BlitImage *getBlitImage() {
+		return _blitImage;
+	}
+
+private:
+	TGLuint _tex;
+	BaseRenderer3D *_renderer;
+	Graphics::Surface *_imageData;
+	Graphics::Surface *_maskData;
+	uint _texWidth{};
+	uint _texHeight{};
+	bool _pixelOpReady;
+	bool _surfaceModified;
+	TinyGL::BlitImage *_blitImage;
+	bool _texture2D;
+
+	bool loadImage();
+	void writeAlpha(Graphics::Surface *surface, const Graphics::Surface *mask);
+};
+
+} // End of namespace Wintermute
+
+#endif // defined(USE_TINYGL)
+
+#endif

engines/wintermute/base/gfx/tinygl/mesh3ds_tinygl.cpp

@@ -0,0 +1,60 @@
+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "engines/wintermute/wintypes.h"
+
+#include "graphics/opengl/system_headers.h"
+
+#if defined(USE_TINYGL)
+
+#include "engines/wintermute/base/gfx/tinygl/mesh3ds_tinygl.h"
+
+namespace Wintermute {
+
+Mesh3DSTinyGL::Mesh3DSTinyGL(BaseGame *inGame) : Mesh3DS(inGame) {
+	_vertexCount = 0;
+	_vertexData = nullptr;
+}
+
+Mesh3DSTinyGL::~Mesh3DSTinyGL() {
+}
+
+void Mesh3DSTinyGL::fillVertexBuffer() {
+	_vertexCount = _numFaces * 3;
+	_vertexData = (Mesh3DSVertex *)_vb.ptr();
+}
+
+void Mesh3DSTinyGL::render(bool color) {
+	if (_vertexCount == 0)
+		return;
+
+	tglEnableClientState(TGL_VERTEX_ARRAY);
+	tglEnableClientState(TGL_COLOR_ARRAY);
+	tglVertexPointer(3, TGL_FLOAT, sizeof(Mesh3DSVertex), &_vertexData[0]._x);
+	tglColorPointer(4, TGL_FLOAT, sizeof(Mesh3DSVertex), &_vertexData[0]._r);
+	tglDrawArrays(TGL_TRIANGLES, 0, _vertexCount);
+	tglDisableClientState(TGL_COLOR_ARRAY);
+	tglDisableClientState(TGL_VERTEX_ARRAY);
+}
+
+} // namespace Wintermute
+
+#endif // defined(USE_TINYGL)

engines/wintermute/base/gfx/tinygl/mesh3ds_tinygl.h

@@ -0,0 +1,49 @@
+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef WINTERMUTE_MESH_TINYGL_H
+#define WINTERMUTE_MESH_TINYGL_H
+
+#include "engines/wintermute/base/gfx/3dmesh.h"
+
+#if defined(USE_TINYGL)
+
+#include "graphics/tinygl/tinygl.h"
+
+namespace Wintermute {
+
+class Mesh3DSTinyGL : public Mesh3DS {
+public:
+	Mesh3DSTinyGL(BaseGame *inGame);
+	~Mesh3DSTinyGL();
+	void fillVertexBuffer() override;
+	void render(bool color) override;
+
+private:
+	Mesh3DSVertex *_vertexData;
+	uint16 _vertexCount;
+};
+
+} // namespace Wintermute
+
+#endif // defined(USE_TINYGL)
+
+#endif

engines/wintermute/base/gfx/tinygl/meshx_tinygl.cpp

@@ -0,0 +1,261 @@
+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * This file is based on WME.
+ * http://dead-code.org/redir.php?target=wme
+ * Copyright (c) 2003-2013 Jan Nedoma and contributors
+ */
+
+#include "engines/wintermute/base/gfx/xmaterial.h"
+#include "engines/wintermute/base/gfx/3deffect.h"
+#include "engines/wintermute/base/gfx/3deffect_params.h"
+#include "engines/wintermute/base/gfx/skin_mesh_helper.h"
+#include "engines/wintermute/base/base_game.h"
+#include "engines/wintermute/base/base_engine.h"
+
+#if defined(USE_TINYGL)
+
+#include "engines/wintermute/base/gfx/tinygl/base_surface_tinygl.h"
+#include "engines/wintermute/base/gfx/tinygl/base_render_tinygl.h"
+#include "engines/wintermute/base/gfx/tinygl/meshx_tinygl.h"
+
+namespace Wintermute {
+
+//////////////////////////////////////////////////////////////////////////
+XMeshTinyGL::XMeshTinyGL(BaseGame *inGame) : XMesh(inGame) {
+}
+
+//////////////////////////////////////////////////////////////////////////
+XMeshTinyGL::~XMeshTinyGL() {
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool XMeshTinyGL::render(XModel *model) {
+	if (!_blendedMesh)
+		return false;
+
+	// For WME DX, mesh model is not visible, possible it's clipped.
+	// For OpenGL, mesh is visible, skip draw it here instead in core.
+	if (!_game->_renderer3D->_camera)
+		return false;
+
+	auto fvf = _blendedMesh->getFVF();
+	uint32 vertexSize = DXGetFVFVertexSize(fvf) / sizeof(float);
+	float *vertexData = (float *)_blendedMesh->getVertexBuffer().ptr();
+	if (vertexData == nullptr) {
+		return false;
+	}
+	uint32 offset = 0, normalOffset = 0, textureOffset = 0;
+	if (fvf & DXFVF_XYZ) {
+		offset += sizeof(DXVector3) / sizeof(float);
+	}
+	if (fvf & DXFVF_NORMAL) {
+		normalOffset = offset;
+		offset += sizeof(DXVector3) / sizeof(float);
+	}
+	if (fvf & DXFVF_DIFFUSE) {
+		offset += sizeof(DXColorValue) / sizeof(float);
+	}
+	if (fvf & DXFVF_TEX1) {
+		textureOffset = offset;
+	}
+	uint32 *indexData = (uint32 *)_blendedMesh->getIndexBuffer().ptr();
+
+	bool noAttrs = false;
+	auto attrsTable = _blendedMesh->getAttributeTable();
+	uint32 numAttrs = attrsTable->_size;
+	DXAttributeRange *attrs;
+	if (numAttrs == 0) {
+		noAttrs = true;
+		numAttrs = 1;
+		attrs = new DXAttributeRange[numAttrs];
+	} else {
+		attrs = attrsTable->_ptr;
+	}
+
+	if (noAttrs) {
+		attrs[0]._attribId = 0;
+		attrs[0]._vertexStart = attrs[0]._faceStart = 0;
+		attrs[0]._vertexCount = _blendedMesh->getNumVertices();
+		attrs[0]._faceCount = _blendedMesh->getNumFaces();
+	}
+
+	for (uint32 i = 0; i < numAttrs; i++) {
+		Material *mat = _materials[attrs[i]._attribId];
+		bool textureEnable = false;
+		if (mat->getSurface()) {
+			textureEnable = true;
+			tglEnable(TGL_TEXTURE_2D);
+			static_cast<BaseSurfaceTinyGL *>(mat->getSurface())->setTexture();
+			tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_MAG_FILTER, TGL_LINEAR);
+			tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_MIN_FILTER, TGL_LINEAR_MIPMAP_LINEAR);
+		} else {
+			tglBindTexture(TGL_TEXTURE_2D, 0);
+			tglDisable(TGL_TEXTURE_2D);
+		}
+
+		if (mat->getEffect()) {
+			renderEffect(mat);
+		} else {
+			tglMaterialfv(TGL_FRONT_AND_BACK, TGL_DIFFUSE, mat->_material._diffuse._data);
+			tglMaterialfv(TGL_FRONT_AND_BACK, TGL_AMBIENT, mat->_material._diffuse._data);
+			tglMaterialfv(TGL_FRONT_AND_BACK, TGL_SPECULAR, mat->_material._specular._data);
+			tglMaterialfv(TGL_FRONT_AND_BACK, TGL_EMISSION, mat->_material._emissive._data);
+			tglMaterialf(TGL_FRONT_AND_BACK, TGL_SHININESS, mat->_material._power);
+		}
+
+		tglEnableClientState(TGL_VERTEX_ARRAY);
+		tglEnableClientState(TGL_NORMAL_ARRAY);
+		if (textureEnable)
+			tglEnableClientState(TGL_TEXTURE_COORD_ARRAY);
+
+		tglVertexPointer(3, TGL_FLOAT, vertexSize * sizeof(float), vertexData);
+		tglNormalPointer(TGL_FLOAT, vertexSize * sizeof(float), vertexData + normalOffset);
+		if (textureEnable)
+			tglTexCoordPointer(2, TGL_FLOAT, vertexSize * sizeof(float), vertexData + textureOffset);
+
+		tglDrawElements(TGL_TRIANGLES, attrsTable->_ptr[i]._faceCount * 3, TGL_UNSIGNED_INT, indexData + attrsTable->_ptr[i]._faceStart * 3);
+
+		tglDisableClientState(TGL_VERTEX_ARRAY);
+		tglDisableClientState(TGL_NORMAL_ARRAY);
+		tglDisableClientState(TGL_TEXTURE_COORD_ARRAY);
+	}
+
+	tglBindTexture(TGL_TEXTURE_2D, 0);
+	tglDisable(TGL_TEXTURE_2D);
+
+	if (noAttrs) {
+		delete[] attrs;
+	}
+
+	return true;
+}
+
+bool XMeshTinyGL::renderFlatShadowModel(uint32 shadowColor) {
+	if (!_blendedMesh)
+		return false;
+
+	// For WME DX, mesh model is not visible, possible it's clipped.
+	// For OpenGL, mesh is visible, skip draw it here instead in core.
+	if (!_game->_renderer3D->_camera)
+		return false;
+
+	// W/A for the scene with the table in the laboratory where the engine switches to flat shadows.
+	// Presumably, it's supposed to disable shadows.
+	// Instead, OpenGL draws graphical glitches.
+	// Original DX version does not have this issue due to rendering shadows differently.
+	if (BaseEngine::instance().getGameId() == "alphapolaris")
+		return false;
+
+	uint32 vertexSize = DXGetFVFVertexSize(_blendedMesh->getFVF()) / sizeof(float);
+	float *vertexData = (float *)_blendedMesh->getVertexBuffer().ptr();
+	if (vertexData == nullptr) {
+		return false;
+	}
+	uint32 *indexData = (uint32 *)_blendedMesh->getIndexBuffer().ptr();
+
+	bool noAttrs = false;
+	auto attrsTable = _blendedMesh->getAttributeTable();
+	uint32 numAttrs = attrsTable->_size;
+	DXAttributeRange *attrs;
+	if (numAttrs == 0) {
+		noAttrs = true;
+		numAttrs = 1;
+		attrs = new DXAttributeRange[numAttrs];
+	} else {
+		attrs = attrsTable->_ptr;
+	}
+
+	if (noAttrs) {
+		attrs[0]._attribId = 0;
+		attrs[0]._vertexStart = attrs[0]._faceStart = 0;
+		attrs[0]._vertexCount = _blendedMesh->getNumVertices();
+		attrs[0]._faceCount = _blendedMesh->getNumFaces();
+	}
+
+	tglBindTexture(TGL_TEXTURE_2D, 0);
+	tglDisable(TGL_TEXTURE_2D);
+
+	tglDisable(TGL_LIGHTING);
+	tglShadeModel(TGL_FLAT);
+
+	tglColorMask(TGL_FALSE, TGL_FALSE, TGL_FALSE, TGL_FALSE);
+	tglDepthMask(TGL_FALSE);
+
+	tglEnable(TGL_STENCIL_TEST);
+	tglStencilFunc(TGL_ALWAYS, 1, 0xff);
+	tglStencilOp(TGL_REPLACE, TGL_REPLACE, TGL_REPLACE);
+
+	for (uint32 i = 0; i < numAttrs; i++) {
+		tglEnableClientState(TGL_VERTEX_ARRAY);
+
+		tglVertexPointer(3, TGL_FLOAT, vertexSize * sizeof(float), vertexData);
+
+		tglDrawElements(TGL_TRIANGLES, attrsTable->_ptr[i]._faceCount * 3, TGL_UNSIGNED_INT, indexData + attrsTable->_ptr[i]._faceStart * 3);
+
+		tglDisableClientState(TGL_VERTEX_ARRAY);
+	}
+
+
+	tglStencilFunc(TGL_EQUAL, 1, 0xff);
+	tglStencilOp(TGL_ZERO, TGL_ZERO, TGL_ZERO);
+
+	tglColor4ub(RGBCOLGetR(shadowColor), RGBCOLGetG(shadowColor), RGBCOLGetB(shadowColor), RGBCOLGetA(shadowColor));
+	tglColorMask(TGL_TRUE, TGL_TRUE, TGL_TRUE, TGL_TRUE);
+	tglEnable(TGL_BLEND);
+	tglBlendFunc(TGL_SRC_ALPHA, TGL_ONE_MINUS_SRC_ALPHA);
+
+	tglDepthMask(TGL_TRUE);
+
+	for (uint32 i = 0; i < numAttrs; i++) {
+		tglEnableClientState(TGL_VERTEX_ARRAY);
+
+		tglVertexPointer(3, TGL_FLOAT, vertexSize * sizeof(float), vertexData);
+
+		tglDrawElements(TGL_TRIANGLES, attrsTable->_ptr[i]._faceCount * 3, TGL_UNSIGNED_INT, indexData + attrsTable->_ptr[i]._faceStart * 3);
+
+		tglDisableClientState(TGL_VERTEX_ARRAY);
+	}
+
+	if (noAttrs) {
+		delete[] attrs;
+	}
+
+	tglDisable(TGL_BLEND);
+	tglDisable(TGL_STENCIL_TEST);
+	tglShadeModel(TGL_SMOOTH);
+	tglEnable(TGL_LIGHTING);
+
+	return true;
+}
+
+void XMeshTinyGL::renderEffect(Material *material) {
+	tglMaterialfv(TGL_FRONT_AND_BACK, TGL_DIFFUSE, material->_material._diffuse._data);
+	tglMaterialfv(TGL_FRONT_AND_BACK, TGL_AMBIENT, material->_material._diffuse._data);
+	tglMaterialfv(TGL_FRONT_AND_BACK, TGL_SPECULAR, material->_material._specular._data);
+	tglMaterialfv(TGL_FRONT_AND_BACK, TGL_EMISSION, material->_material._emissive._data);
+	tglMaterialf(TGL_FRONT_AND_BACK, TGL_SHININESS, material->_material._power);
+}
+
+} // namespace Wintermute
+
+#endif // defined(USE_TINYGL)

engines/wintermute/base/gfx/tinygl/meshx_tinygl.h

@@ -0,0 +1,58 @@
+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * This file is based on WME.
+ * http://dead-code.org/redir.php?target=wme
+ * Copyright (c) 2003-2013 Jan Nedoma and contributors
+ */
+
+#ifndef WINTERMUTE_XMESH_TINYGL_H
+#define WINTERMUTE_XMESH_TINYGL_H
+
+#include "engines/wintermute/base/gfx/xmesh.h"
+
+class Effect3D;
+class Effect3DParams;
+
+#if defined(USE_TINYGL)
+
+#include "graphics/tinygl/tinygl.h"
+
+namespace Wintermute {
+
+class XMeshTinyGL : public XMesh {
+public:
+	XMeshTinyGL(BaseGame *inGame);
+	~XMeshTinyGL() override;
+
+	bool render(XModel *model) override;
+	bool renderFlatShadowModel(uint32 shadowColor) override;
+
+private:
+	void renderEffect(Material *material);
+};
+
+} // namespace Wintermute
+
+#endif // defined(USE_TINYGL)
+
+#endif

engines/wintermute/base/gfx/tinygl/shadow_volume_tinygl.cpp

@@ -0,0 +1,195 @@
+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * This file is based on WME.
+ * http://dead-code.org/redir.php?target=wme
+ * Copyright (c) 2003-2013 Jan Nedoma and contributors
+ */
+
+#include "engines/wintermute/base/base_game.h"
+#include "engines/wintermute/dcgf.h"
+
+#if defined(USE_TINYGL)
+
+#include "engines/wintermute/base/gfx/tinygl/base_render_tinygl.h"
+#include "engines/wintermute/base/gfx/tinygl/shadow_volume_tinygl.h"
+
+namespace Wintermute {
+
+//////////////////////////////////////////////////////////////////////////
+ShadowVolumeTinyGL::ShadowVolumeTinyGL(BaseGame *inGame) : ShadowVolume(inGame) {
+}
+
+//////////////////////////////////////////////////////////////////////////
+ShadowVolumeTinyGL::~ShadowVolumeTinyGL() {
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool ShadowVolumeTinyGL::render() {
+	tglBindTexture(TGL_TEXTURE_2D, 0);
+	tglDisable(TGL_TEXTURE_2D);
+	_game->_renderer3D->_lastTexture = nullptr;
+
+	tglEnableClientState(TGL_VERTEX_ARRAY);
+	tglVertexPointer(3, TGL_FLOAT, 0, _vertices.getData());
+	tglDrawArrays(TGL_TRIANGLES, 0, _vertices.getSize());
+	tglDisableClientState(TGL_VERTEX_ARRAY);
+
+	return true;
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool ShadowVolumeTinyGL::renderToStencilBuffer() {
+	// Disable z-buffer/color writes (note: z-testing still occurs), and enable the
+	// stencil-buffer
+	tglDepthMask(TGL_FALSE);
+	tglColorMask(TGL_FALSE, TGL_FALSE, TGL_FALSE, TGL_FALSE);
+	tglDisable(TGL_TEXTURE_2D);
+	tglDisable(TGL_LIGHTING);
+	tglEnable(TGL_STENCIL_TEST);
+	tglEnable(TGL_CULL_FACE);
+
+	// Set up stencil compare fuction, reference value, and masks.
+	// Stencil test passes if ((ref & mask) cmpfn (stencil & mask)) is true.
+	// Note: since we set up the stencil-test to always pass, the STENCILFAIL
+	// renderstate is really not needed.
+	tglStencilFunc(TGL_ALWAYS, 0x1, 0xff);
+
+	tglShadeModel(TGL_FLAT);
+
+	tglStencilOp(TGL_KEEP, TGL_KEEP, TGL_INCR);
+
+	// Draw back-side of shadow volume in stencil/z only
+	tglFrontFace(TGL_CCW);
+	render();
+
+	// Decrement stencil buffer value
+	tglStencilOp(TGL_KEEP, TGL_KEEP, TGL_DECR);
+
+	// Draw front-side of shadow volume in stencil/z only
+	tglFrontFace(TGL_CW);
+	render();
+
+	// Restore render states
+	tglEnable(TGL_LIGHTING);
+	tglFrontFace(TGL_CCW);
+	tglShadeModel(TGL_SMOOTH);
+	tglDepthMask(TGL_TRUE);
+	tglColorMask(TGL_TRUE, TGL_TRUE, TGL_TRUE, TGL_TRUE);
+	tglDisable(TGL_STENCIL_TEST);
+	tglDisable(TGL_BLEND);
+
+	return true;
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool ShadowVolumeTinyGL::renderToScene() {
+	initMask();
+
+	tglDisable(TGL_DEPTH_TEST);
+	tglEnable(TGL_STENCIL_TEST);
+	tglEnable(TGL_BLEND);
+	tglBlendFunc(TGL_SRC_ALPHA, TGL_ONE_MINUS_SRC_ALPHA);
+
+	// Only write where stencil val >= 1 (count indicates # of shadows that overlap that pixel)
+	tglStencilFunc(TGL_LEQUAL, 0x1, 0xff);
+	tglStencilOp(TGL_KEEP, TGL_KEEP, TGL_KEEP);
+
+	tglDisable(TGL_FOG);
+	tglDisable(TGL_LIGHTING);
+	tglDisable(TGL_ALPHA_TEST);
+
+	tglBindTexture(TGL_TEXTURE_2D, 0);
+
+	BaseRenderTinyGL *renderer = (BaseRenderTinyGL *)_game->_renderer3D;
+	renderer->setProjection2D();
+
+	// FIXME: CW->CCW Why it differ from OpenGL?
+	tglFrontFace(TGL_CCW);
+
+	tglEnableClientState(TGL_COLOR_ARRAY);
+	tglEnableClientState(TGL_VERTEX_ARRAY);
+
+	// Draw a big, gray square
+	tglVertexPointer(3, TGL_FLOAT, sizeof(ShadowVertex), &_shadowMask[0].x);
+	tglColorPointer(4, TGL_UNSIGNED_BYTE, sizeof(ShadowVertex), &_shadowMask[0].r);
+
+	tglDrawArrays(TGL_TRIANGLE_STRIP, 0, 4);
+
+	tglDisableClientState(TGL_COLOR_ARRAY);
+	tglDisableClientState(TGL_VERTEX_ARRAY);
+
+	// Restore render states
+	tglEnable(TGL_DEPTH_TEST);
+	tglDisable(TGL_STENCIL_TEST);
+
+	_game->_renderer3D->setup3D(nullptr, true);
+
+	// clear stencil buffer
+	tglClearStencil(0);
+	tglClear(TGL_STENCIL_BUFFER_BIT);
+
+	return true;
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool ShadowVolumeTinyGL::initMask() {
+	auto *rend = _game->_renderer3D;
+
+	// bottom left
+	_shadowMask[0].x = 0.0f;
+	_shadowMask[0].y = rend->getHeight();
+	_shadowMask[0].z = 1.0f;
+
+	// top left
+	_shadowMask[1].x = 0.0f;
+	_shadowMask[1].y = 0.0f;
+	_shadowMask[1].z = 1.0f;
+
+	// bottom right
+	_shadowMask[2].x = rend->getWidth();
+	_shadowMask[2].y = rend->getHeight();
+	_shadowMask[2].z = 1.0f;
+
+	// top right
+	_shadowMask[3].x = rend->getWidth();
+	_shadowMask[3].y = 0.0f;
+	_shadowMask[3].z = 1.0f;
+
+	byte a = RGBCOLGetA(_color);
+	byte r = RGBCOLGetR(_color);
+	byte g = RGBCOLGetG(_color);
+	byte b = RGBCOLGetB(_color);
+
+	for (int i = 0; i < 4; ++i) {
+		_shadowMask[i].r = r;
+		_shadowMask[i].g = g;
+		_shadowMask[i].b = b;
+		_shadowMask[i].a = a;
+	}
+
+	return true;
+}
+
+} // namespace Wintermute
+
+#endif // defined(USE_TINYGL)

engines/wintermute/base/gfx/tinygl/shadow_volume_tinygl.h

@@ -0,0 +1,57 @@
+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * This file is based on WME.
+ * http://dead-code.org/redir.php?target=wme
+ * Copyright (c) 2003-2013 Jan Nedoma and contributors
+ */
+
+#ifndef WINTERMUTE_SHADOW_VOLUME_TINYGL_H
+#define WINTERMUTE_SHADOW_VOLUME_TINYGL_H
+
+#include "engines/wintermute/base/gfx/3dshadow_volume.h"
+
+#if defined(USE_TINYGL)
+
+#include "graphics/tinygl/tinygl.h"
+
+namespace Wintermute {
+
+class ShadowVolumeTinyGL : public ShadowVolume {
+public:
+	ShadowVolumeTinyGL(BaseGame *inGame);
+	virtual ~ShadowVolumeTinyGL();
+
+	bool renderToStencilBuffer() override;
+	bool renderToScene() override;
+
+private:
+	bool render();
+	ShadowVertex _shadowMask[4]{};
+	bool initMask() override;
+};
+
+} // namespace Wintermute
+
+#endif // defined(USE_TINYGL)
+
+#endif