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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 "common/scummsys.h"
#if defined(USE_OPENGL) || defined(USE_GLES2) || defined(USE_OPENGL_SHADERS)
#include "engines/myst3/gfx_opengl_texture.h"
#include "graphics/opengl/context.h"
namespace Myst3 {
// From Bit Twiddling Hacks
static uint32 upperPowerOfTwo(uint32 v) {
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
return v;
}
OpenGLTexture::OpenGLTexture(const Graphics::Surface *surface) {
width = surface->w;
height = surface->h;
format = surface->format;
// Pad the textures if non power of two support is unavailable
if (OpenGLContext.NPOTSupported) {
internalHeight = height;
internalWidth = width;
} else {
internalHeight = upperPowerOfTwo(height);
internalWidth = upperPowerOfTwo(width);
}
if (format.bytesPerPixel == 4) {
assert(surface->format == getRGBAPixelFormat());
internalFormat = GL_RGBA;
sourceFormat = GL_UNSIGNED_BYTE;
} else if (format.bytesPerPixel == 2) {
internalFormat = GL_RGB;
sourceFormat = GL_UNSIGNED_SHORT_5_6_5;
} else
error("Unknown pixel format");
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, internalWidth, internalHeight, 0, internalFormat, sourceFormat, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// TODO: If non power of two textures are unavailable this clamping
// has no effect on the padded sides (resulting in white lines on the edges)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
update(surface);
}
OpenGLTexture::~OpenGLTexture() {
glDeleteTextures(1, &id);
}
void OpenGLTexture::update(const Graphics::Surface *surface) {
updatePartial(surface, Common::Rect(surface->w, surface->h));
}
void OpenGLTexture::updateTexture(const Graphics::Surface* surface, const Common::Rect& rect) {
assert(surface->format == format);
glBindTexture(GL_TEXTURE_2D, id);
if (OpenGLContext.unpackSubImageSupported) {
const Graphics::Surface subArea = surface->getSubArea(rect);
glPixelStorei(GL_UNPACK_ROW_LENGTH, surface->pitch / surface->format.bytesPerPixel);
glTexSubImage2D(GL_TEXTURE_2D, 0, rect.left, rect.top, subArea.w, subArea.h, internalFormat, sourceFormat, subArea.getPixels());
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
} else {
// GL_UNPACK_ROW_LENGTH is not supported, don't bother and do a full texture update
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, surface->w, surface->h, internalFormat, sourceFormat, surface->getPixels());
}
}
void OpenGLTexture::updatePartial(const Graphics::Surface *surface, const Common::Rect &rect) {
updateTexture(surface, rect);
}
} // End of namespace Myst3
#endif
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