Initial commit

engines/stark/gfx/openglbitmap.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 "engines/stark/gfx/openglbitmap.h"
+
+#include "engines/stark/gfx/driver.h"
+
+#include "graphics/surface.h"
+
+#if defined(USE_OPENGL_GAME) || defined(USE_OPENGL_SHADERS)
+
+#include "graphics/opengl/context.h"
+
+namespace Stark {
+namespace Gfx {
+
+OpenGlBitmap::OpenGlBitmap() :
+	Bitmap(),
+	_id(0) {
+	glGenTextures(1, &_id);
+
+	bind();
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+}
+
+OpenGlBitmap::~OpenGlBitmap() {
+	glDeleteTextures(1, &_id);
+}
+
+void OpenGlBitmap::bind() const {
+	glBindTexture(GL_TEXTURE_2D, _id);
+}
+
+void OpenGlBitmap::update(const Graphics::Surface *surface, const byte *palette) {
+	bind();
+
+	const Graphics::Surface *rgbaSurface = surface;
+	if (surface->format != Driver::getRGBAPixelFormat()) {
+		// Convert the surface to texture format
+		rgbaSurface = surface->convertTo(Driver::getRGBAPixelFormat(), palette);
+	}
+
+	_width = rgbaSurface->w;
+	_height = rgbaSurface->h;
+
+	GLfloat s, t;
+
+	if (!OpenGLContext.NPOTSupported) {
+		uint32 texWidth  = Common::nextHigher2(rgbaSurface->w);
+		uint32 texHeight = Common::nextHigher2(rgbaSurface->h);
+		s = (GLfloat)_width / texWidth;
+		t = (GLfloat)_height / texHeight;
+
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth, texHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+		glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, rgbaSurface->w, rgbaSurface->h,
+		                GL_RGBA, GL_UNSIGNED_BYTE, rgbaSurface->getPixels());
+	} else {
+		s = t = 1.f;
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, rgbaSurface->w, rgbaSurface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, rgbaSurface->getPixels());
+	}
+
+	_texCoords[0*2+0] = 0.0f;
+	_texCoords[0*2+1] = 0.0f;
+	_texCoords[1*2+0] = s;
+	_texCoords[1*2+1] = 0.0f;
+	_texCoords[2*2+0] = 0.0f;
+	_texCoords[2*2+1] = t;
+	_texCoords[3*2+0] = s;
+	_texCoords[3*2+1] = t;
+
+	if (rgbaSurface != surface) {
+		const_cast<Graphics::Surface *>(rgbaSurface)->free();
+		delete rgbaSurface;
+	}
+}
+
+void OpenGlBitmap::setSamplingFilter(Bitmap::SamplingFilter filter) {
+	switch (filter) {
+	case kNearest:
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+		break;
+	case kLinear:
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+		break;
+	default:
+		warning("Unhandled sampling filter %d", filter);
+	}
+}
+
+Graphics::PixelFormat OpenGlBitmap::getBestPixelFormat() const {
+	return Driver::getRGBAPixelFormat();
+}
+
+} // End of namespace Gfx
+} // End of namespace Stark
+
+#endif // defined(USE_OPENGL_GAME) || defined(USE_OPENGL_SHADERS)