Initial commit

engines/stark/gfx/opengltexture.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/opengltexture.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 {
+
+OpenGlTexture::OpenGlTexture() :
+	Texture(),
+	_id(0),
+	_levelCount(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);
+}
+
+OpenGlTexture::~OpenGlTexture() {
+	glDeleteTextures(1, &_id);
+}
+
+void OpenGlTexture::bind() const {
+	glBindTexture(GL_TEXTURE_2D, _id);
+}
+
+void OpenGlTexture::updateLevel(uint32 level, const Graphics::Surface *surface, const byte *palette) {
+	const Graphics::Surface *rgbaSurface = surface;
+	if (surface->format != Driver::getRGBAPixelFormat()) {
+		// Convert the surface to texture format
+		rgbaSurface = surface->convertTo(Driver::getRGBAPixelFormat(), palette);
+	}
+
+	// Stark textures (not bitmaps!) are always POT
+	glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, rgbaSurface->w, rgbaSurface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, rgbaSurface->getPixels());
+
+	if (rgbaSurface != surface) {
+		const_cast<Graphics::Surface *>(rgbaSurface)->free();
+		delete rgbaSurface;
+	}
+}
+
+void OpenGlTexture::setLevelCount(uint32 count) {
+	_levelCount = count;
+
+	if (count >= 1) {
+		// GLES1 and GLES2 do not allow setting the max provided mipmap level.
+		// It expects all the levels to be provided, which is not the case in TLJ.
+		// FIXME: Enable mipmapping on GLES without this extension
+		if (OpenGLContext.textureMaxLevelSupported) {
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, count - 1);
+
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+		}
+
+		// TODO: Provide a fallback if this isn't available.
+		if (OpenGLContext.textureMirrorRepeatSupported) {
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
+		}
+	}
+}
+
+void OpenGlTexture::addLevel(uint32 level, const Graphics::Surface *surface, const byte *palette) {
+	assert(level < _levelCount);
+
+	if (level == 0 || OpenGLContext.textureMaxLevelSupported) {
+		updateLevel(level, surface, palette);
+	}
+}
+
+} // End of namespace Gfx
+} // End of namespace Stark
+
+#endif // defined(USE_OPENGL_GAME) || defined(USE_OPENGL_SHADERS)