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https://github.com/libretro/scummvm.git
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95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
/* ResidualVM - A 3D game interpreter
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*
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* ResidualVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the AUTHORS
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "engines/myst3/gfx_tinygl_texture.h"
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#include "graphics/tinygl/zblit.h"
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namespace Myst3 {
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// From Bit Twiddling Hacks
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static uint32 upperPowerOfTwo(uint32 v) {
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v--;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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v++;
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return v;
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}
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TinyGLTexture::TinyGLTexture(const Graphics::Surface *surface, bool nonPoTSupport) {
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width = surface->w;
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height = surface->h;
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format = surface->format;
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// Pad the textures if non power of two support is unavailable
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if (nonPoTSupport) {
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internalHeight = height;
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internalWidth = width;
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} else {
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internalHeight = upperPowerOfTwo(height);
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internalWidth = upperPowerOfTwo(width);
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}
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if (format.bytesPerPixel == 4) {
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internalFormat = TGL_RGBA;
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sourceFormat = TGL_UNSIGNED_BYTE;
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} else if (format.bytesPerPixel == 2) {
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internalFormat = TGL_RGB;
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sourceFormat = TGL_UNSIGNED_BYTE; // UNSIGNED_SHORT_5_6_5 not provided
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} else
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error("Unknown pixel format");
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tglGenTextures(1, &id);
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tglBindTexture(TGL_TEXTURE_2D, id);
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tglTexImage2D(TGL_TEXTURE_2D, 0, 3, internalWidth, internalHeight, 0, internalFormat, sourceFormat, 0);
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tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_MIN_FILTER, TGL_LINEAR);
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tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_MAG_FILTER, TGL_LINEAR);
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// NOTE: TinyGL doesn't have issues with white lines so doesn't need use TGL_CLAMP_TO_EDGE
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tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_WRAP_S, TGL_REPEAT);
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tglTexParameteri(TGL_TEXTURE_2D, TGL_TEXTURE_WRAP_T, TGL_REPEAT);
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_blitImage = Graphics::tglGenBlitImage();
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update(surface);
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}
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TinyGLTexture::~TinyGLTexture() {
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tglDeleteTextures(1, &id);
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tglDeleteBlitImage(_blitImage);
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}
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void TinyGLTexture::update(const Graphics::Surface *surface) {
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tglBindTexture(TGL_TEXTURE_2D, id);
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tglTexImage2D(TGL_TEXTURE_2D, 0, 3, internalWidth, internalHeight, 0,
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internalFormat, sourceFormat, const_cast<void *>(surface->getPixels())); // TESTME: Not sure if it works.
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Graphics::tglUploadBlitImage(_blitImage, *surface, 0, false);
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}
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Graphics::BlitImage *TinyGLTexture::getBlitTexture() const {
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return _blitImage;
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}
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} // End of namespace Myst3
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