Initial commit

engines/watchmaker/3d/render/opengl_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 "watchmaker/3d/render/opengl_texture.h"
+#include "common/textconsole.h"
+#include "graphics/opengl/system_headers.h"
+#include "watchmaker/3d/dds_header.h"
+#include "watchmaker/render.h"
+
+#ifdef USE_OPENGL_GAME
+
+namespace Watchmaker {
+
+GLuint dxtCompressionToTextureFormat(DxtCompression compression) {
+	switch (compression) {
+	case DxtCompression::UNCOMPRESSED:
+	default:
+		return GL_RGBA;
+	case DxtCompression::DXT1:
+		return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
+	case DxtCompression::DXT2:
+		error("DXT2 Support is not implemented");
+	case DxtCompression::DXT3:
+		return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
+	case DxtCompression::DXT4:
+		error("DXT4 Support is not implemented");
+	case DxtCompression::DXT5:
+		return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
+	}
+}
+
+class OpenGLTexture : public Texture {
+public:
+	unsigned int _texId;
+	OpenGLTexture() {
+		glGenTextures(1, &_texId);
+	}
+	OpenGLTexture(unsigned int texId) : _texId(texId) {}
+	void assignData(const TextureData &data) override {
+		glBindTexture(GL_TEXTURE_2D, _texId);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+
+		// TODO: Check both compiletime and runtime for the existence of EXT_texture_compression_s3tc
+		GLuint texFormat = dxtCompressionToTextureFormat(data._compression);
+		bool compressed = data._compression != DxtCompression::UNCOMPRESSED;
+
+		if (compressed) {
+			glCompressedTexImage2D(GL_TEXTURE_2D, // target
+								   0, // level
+								   texFormat, // internalFormat
+								   data.getWidth(), // width
+								   data.getHeight(), // height
+								   0, // border
+								   data.getDataSize(),
+								   data.getData()
+			);
+			checkGlError("glCompressedTexImage");
+		} else {
+			glTexImage2D(GL_TEXTURE_2D, 0, texFormat, data.getWidth(), data.getHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, data.getData());
+			checkGlError("glTexImage2D");
+		}
+	}
+	void bind() override {
+		glBindTexture(GL_TEXTURE_2D, _texId);
+		checkGlError("OpenGLTexture::bind");
+	};
+};
+
+Texture *createGLTexture() {
+	return new OpenGLTexture();
+}
+
+} // End of namespace Watchmaker
+
+#endif // USE_OPENGL_GAME