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/* ResidualVM - A 3D game interpreter
*
* ResidualVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the AUTHORS
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "engines/stark/gfx/opengltexture.h"
#include "engines/stark/gfx/driver.h"
#include "graphics/surface.h"
#include "graphics/opengl/system_headers.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 (level == 0) {
_width = surface->w;
_height = surface->h;
}
if (surface->format.bytesPerPixel != 4) {
// 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 {
assert(surface->format == Driver::getRGBAPixelFormat());
glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, surface->w, surface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, surface->getPixels());
}
}
void OpenGlTexture::update(const Graphics::Surface *surface, const byte *palette) {
bind();
updateLevel(0, surface, palette);
}
void OpenGlTexture::setLevelCount(uint32 count) {
_levelCount = count;
if (count >= 1) {
#if !defined(USE_GLES2)
// GLES2 does 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 GLES2
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, count - 1);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
#endif
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
glTexParameterf(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 defined(USE_GLES2)
if (level == 0)
#endif
{
updateLevel(level, surface, palette);
}
}
} // End of namespace Gfx
} // End of namespace Stark
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