mirror of
https://github.com/libretro/scummvm.git
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134 lines
4.1 KiB
C++
134 lines
4.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "engines/stark/gfx/opengltexture.h"
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#include "engines/stark/gfx/driver.h"
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#include "graphics/surface.h"
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#if defined(USE_OPENGL_GAME) || defined(USE_OPENGL_SHADERS)
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#include "graphics/opengl/context.h"
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namespace Stark {
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namespace Gfx {
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OpenGlTexture::OpenGlTexture() :
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Texture(),
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_id(0),
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_levelCount(0) {
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glGenTextures(1, &_id);
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bind();
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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}
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OpenGlTexture::~OpenGlTexture() {
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glDeleteTextures(1, &_id);
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}
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void OpenGlTexture::bind() const {
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glBindTexture(GL_TEXTURE_2D, _id);
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}
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void OpenGlTexture::updateLevel(uint32 level, const Graphics::Surface *surface, const byte *palette) {
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if (level == 0) {
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_width = surface->w;
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_height = surface->h;
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}
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if (surface->format.bytesPerPixel != 4) {
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// Convert the surface to texture format
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Graphics::Surface *convertedSurface = surface->convertTo(Driver::getRGBAPixelFormat(), palette);
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glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, convertedSurface->w, convertedSurface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, convertedSurface->getPixels());
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convertedSurface->free();
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delete convertedSurface;
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} else {
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assert(surface->format == Driver::getRGBAPixelFormat());
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glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, surface->w, surface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, surface->getPixels());
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}
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}
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void OpenGlTexture::update(const Graphics::Surface *surface, const byte *palette) {
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bind();
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updateLevel(0, surface, palette);
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}
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void OpenGlTexture::setSamplingFilter(Texture::SamplingFilter filter) {
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assert(_levelCount == 0);
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switch (filter) {
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case kNearest:
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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break;
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case kLinear:
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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break;
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default:
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warning("Unhandled sampling filter %d", filter);
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}
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}
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void OpenGlTexture::setLevelCount(uint32 count) {
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_levelCount = count;
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if (count >= 1) {
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#if !USE_FORCED_GLES2
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// GLES2 does not allow setting the max provided mipmap level.
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// It expects all the levels to be provided, which is not the case in TLJ.
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// FIXME: Enable mipmapping on GLES2
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if (OpenGLContext.type != OpenGL::kOGLContextGLES2) {
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, count - 1);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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}
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#endif
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
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}
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}
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void OpenGlTexture::addLevel(uint32 level, const Graphics::Surface *surface, const byte *palette) {
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assert(level < _levelCount);
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if (level == 0 || OpenGLContext.type != OpenGL::kOGLContextGLES2) {
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updateLevel(level, surface, palette);
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}
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}
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} // End of namespace Gfx
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} // End of namespace Stark
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#endif // defined(USE_OPENGL_GAME) || defined(USE_OPENGL_SHADERS)
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