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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) {
if (surface->format != Driver::getRGBAPixelFormat()) {
// Convert the surface to texture format
Graphics::Surface *convertedSurface = surface->convertTo(Driver::getRGBAPixelFormat(), palette);
glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, convertedSurface->w, convertedSurface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, convertedSurface->getPixels());
convertedSurface->free();
delete convertedSurface;
} else {
glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, surface->w, surface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, surface->getPixels());
}
}
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);
}
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)
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