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engines/freescape/gfx_tinygl_texture.cpp

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+/* 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 "graphics/tinygl/zblit.h"
+
+#include "freescape/gfx_tinygl_texture.h"
+
+namespace Freescape {
+
+TinyGL2DTexture::TinyGL2DTexture(const Graphics::Surface *surface) {
+	_width = surface->w;
+	_height = surface->h;
+	_format = surface->format;
+	_internalFormat = 0;
+	_sourceFormat = 0;
+
+	_blitImage = tglGenBlitImage();
+
+	update(surface);
+}
+
+TinyGL2DTexture::~TinyGL2DTexture() {
+	tglDeleteBlitImage(_blitImage);
+}
+
+void TinyGL2DTexture::update(const Graphics::Surface *surface) {
+	uint32 keyColor = surface->format.RGBToColor(0xA0, 0xA0, 0xA0);
+	tglUploadBlitImage(_blitImage, *surface, keyColor, true);
+}
+
+void TinyGL2DTexture::updatePartial(const Graphics::Surface *surface, const Common::Rect &rect) {
+	// FIXME: TinyGL does not support partial texture update
+	update(surface);
+}
+
+TinyGL::BlitImage *TinyGL2DTexture::getBlitTexture() const {
+	return _blitImage;
+}
+
+TinyGL3DTexture::TinyGL3DTexture(byte *stipple, uint32 c1, uint32 c2) {
+	Graphics::Surface *surface = new Graphics::Surface();
+	int width = 32;
+	int height = 32;
+
+	surface->create(width, height, getRGBAPixelFormat());
+	surface->fillRect(Common::Rect(0, 0, width, height), surface->format.RGBToColor(0, 0, 0xFF));
+
+	const int stippleWidth = 32;
+	const int stippleHeight = 32;
+
+
+	for (int y = 0; y < height; ++y) {
+		for (int x = 0; x < width; ++x) {
+
+			// Match OpenGL's stipple bit layout
+			int stippleX = x % stippleWidth; // Bit position in the row
+			int stippleY = y % stippleHeight; // Row index
+
+			int byteIndex = stippleY * 4 + (stippleX / 8); // 4 bytes per row
+			int bitIndex = stippleX % 8;
+
+			byte bitmask = 1 << (7 - bitIndex);
+			bool isForeground = stipple[byteIndex] & bitmask;
+			//debug("stippleX=%d stippleY=%d byteIndex=%d bitIndex=%d stipple[byteIndex]: %x color: %s", stippleX, stippleY, byteIndex, bitIndex, stipple[byteIndex], isForeground ? "X" : " ");
+			surface->setPixel(stippleX, stippleY, isForeground ? c1 : c2);
+		}
+	}
+	//assert(0);
+	Graphics::Surface *texture = new Graphics::Surface();
+	texture->create(320, 200, getRGBAPixelFormat());
+	texture->fillRect(Common::Rect(0, 0, 320, 200), texture->format.RGBToColor(0, 0, 0xFF));
+	//texture->copyRectToSurface(*surface, 0, 0, Common::Rect(0, 0, 32, 32));
+
+	// Replicate the stipple pattern to fill the entire texture
+	for (int x = 0; x < 320; x += width) {
+		for (int y = 0; y < 200; y += height) {
+			if (x + width >= 320 || y + height >= 200) {
+				texture->copyRectToSurface(*surface, x, y, Common::Rect(0, 0, MIN(width, 320 - x), MIN(height, 200 - y)));
+			} else
+				texture->copyRectToSurface(*surface, x, y, Common::Rect(0, 0, width, height));
+		}
+	}
+
+	// This surface is no longer needed
+	surface->free();
+	delete surface;
+
+	_width = texture->w;
+	_height = texture->h;
+	_format = texture->format;
+	_upsideDown = false;
+
+	if (_format.bytesPerPixel == 4) {
+		assert(texture->format == getRGBAPixelFormat());
+		_format = texture->format;
+		_internalFormat = TGL_RGBA;
+		_sourceFormat = TGL_UNSIGNED_BYTE;
+	} else if (_format.bytesPerPixel == 2) {
+		_internalFormat = TGL_RGB;
+		_sourceFormat = TGL_UNSIGNED_SHORT_5_6_5;
+	} else
+		error("Unknown pixel format");
+
+	tglGenTextures(1, &_id);
+	tglBindTexture(TGL_TEXTURE_2D, _id);
+	tglTexImage2D(TGL_TEXTURE_2D, 0, _internalFormat, _width, _height, 0, _internalFormat, _sourceFormat, nullptr);
+	tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_MIN_FILTER, TGL_NEAREST);
+	tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_MAG_FILTER, TGL_NEAREST);
+
+	update(texture);
+
+	texture->free();
+	delete texture;
+}
+
+TinyGL3DTexture::TinyGL3DTexture(const Graphics::Surface *surface) {
+	_width = surface->w;
+	_height = surface->h;
+	_format = surface->format;
+	_upsideDown = false;
+
+	if (_format.bytesPerPixel == 4) {
+		assert(surface->format == getRGBAPixelFormat());
+		_format = surface->format;
+		_internalFormat = TGL_RGBA;
+		_sourceFormat = TGL_UNSIGNED_BYTE;
+	} else if (_format.bytesPerPixel == 2) {
+		_internalFormat = TGL_RGB;
+		_sourceFormat = TGL_UNSIGNED_SHORT_5_6_5;
+	} else
+		error("Unknown pixel format");
+
+
+	tglGenTextures(1, &_id);
+	tglBindTexture(TGL_TEXTURE_2D, _id);
+	tglTexImage2D(TGL_TEXTURE_2D, 0, _internalFormat, _width, _height, 0, _internalFormat, _sourceFormat, nullptr);
+	tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_MIN_FILTER, TGL_NEAREST);
+	tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_MAG_FILTER, TGL_NEAREST);
+
+	// NOTE: TinyGL doesn't have issues with white lines so doesn't need use TGL_CLAMP_TO_EDGE
+	//tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_WRAP_S, TGL_CLAMP_TO_EDGE);
+	//tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_WRAP_T, TGL_CLAMP_TO_EDGE);
+	update(surface);
+}
+
+TinyGL3DTexture::~TinyGL3DTexture() {
+	tglDeleteTextures(1, &_id);
+}
+
+void TinyGL3DTexture::update(const Graphics::Surface *surface) {
+	assert(surface->format == _format);
+
+	tglBindTexture(TGL_TEXTURE_2D, _id);
+	tglTexImage2D(TGL_TEXTURE_2D, 0, _internalFormat, surface->w, surface->h, 0, _internalFormat, _sourceFormat, const_cast<void *>(surface->getPixels()));
+}
+
+void TinyGL3DTexture::updatePartial(const Graphics::Surface *surface, const Common::Rect &rect) {
+	// FIXME: TinyGL does not support partial texture update
+	update(surface);
+}
+
+} // End of namespace Freescape