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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 "common/textconsole.h"
#if defined(USE_OPENGL_GAME) || defined(USE_OPENGL_SHADERS)
#include "backends/graphics3d/opengl/texture.h"
#include "graphics/opengl/context.h"
namespace OpenGL {
template<class T>
static T nextHigher2(T k) {
if (k == 0)
return 1;
--k;
for (uint i = 1; i < sizeof(T) * 8; i <<= 1)
k = k | k >> i;
return k + 1;
}
const Graphics::PixelFormat TextureGL::getRGBAPixelFormat() {
#ifdef SCUMM_BIG_ENDIAN
return Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0);
#else
return Graphics::PixelFormat(4, 8, 8, 8, 8, 0, 8, 16, 24);
#endif
}
const Graphics::PixelFormat TextureGL::get565PixelFormat() {
return Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0);
}
TextureGL::TextureGL(const Graphics::Surface &srf) :
_managedTexture(true), _width(srf.w), _height(srf.h) {
if (OpenGLContext.NPOTSupported) {
_texWidth = _width;
_texHeight = _height;
} else {
_texWidth = nextHigher2(_width);
_texHeight = nextHigher2(_height);
}
const Graphics::Surface *surfaceToUpload = &srf;
Graphics::Surface *convertedSurface = nullptr;
Graphics::Surface *copiedSurface = nullptr;
GLenum type;
GLenum format;
if (srf.format == getRGBAPixelFormat()) {
type = GL_UNSIGNED_BYTE;
format = GL_RGBA;
} else if (srf.format == get565PixelFormat()) {
type = GL_UNSIGNED_SHORT_5_6_5;
format = GL_RGB;
} else {
type = GL_UNSIGNED_BYTE;
format = GL_RGBA;
convertedSurface = srf.convertTo(getRGBAPixelFormat());
surfaceToUpload = convertedSurface;
}
if (surfaceToUpload->pitch != surfaceToUpload->w * surfaceToUpload->format.bytesPerPixel) {
if (OpenGLContext.unpackSubImageSupported) {
glPixelStorei(GL_UNPACK_ROW_LENGTH, surfaceToUpload->pitch / surfaceToUpload->format.bytesPerPixel);
} else {
// When unpack sub-image is not supported we can't specify the pitch
// and have to copy the subimage
copiedSurface = new Graphics::Surface();
copiedSurface->copyFrom(*surfaceToUpload);
surfaceToUpload = copiedSurface;
}
}
glGenTextures(1, &_texture);
glBindTexture(GL_TEXTURE_2D, _texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, format, _texWidth, _texHeight, 0, format, type, 0);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, _width, _height, format, type, const_cast<void *>(surfaceToUpload->getPixels()));
if (OpenGLContext.unpackSubImageSupported) {
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
}
if (convertedSurface) {
convertedSurface->free();
delete convertedSurface;
}
if (copiedSurface) {
copiedSurface->free();
delete copiedSurface;
}
}
TextureGL::TextureGL(uint width, uint height) :
_managedTexture(true), _width(width), _height(height) {
if (OpenGLContext.NPOTSupported) {
_texWidth = _width;
_texHeight = _height;
} else {
_texWidth = nextHigher2(_width);
_texHeight = nextHigher2(_height);
}
glGenTextures(1, &_texture);
glBindTexture(GL_TEXTURE_2D, _texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, _texWidth, _texHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
}
TextureGL::TextureGL(GLuint texture_name, uint width, uint height, uint texture_width, uint texture_height) :
_managedTexture(false), _texture(texture_name), _width(width), _height(height),
_texWidth(texture_width), _texHeight(texture_height) {
}
TextureGL::~TextureGL() {
if (_managedTexture) {
glDeleteTextures(1, &_texture);
}
}
} // End of namespace OpenGL
#endif
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