mirror of
https://github.com/libretro/scummvm.git
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117 lines
3.7 KiB
C++
117 lines
3.7 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 "common/scummsys.h"
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#if defined(USE_OPENGL) || defined(USE_GLES2) || defined(USE_OPENGL_SHADERS)
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#include "engines/myst3/gfx_opengl_texture.h"
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#include "graphics/opengl/context.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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OpenGLTexture::OpenGLTexture(const Graphics::Surface *surface) {
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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 (OpenGLContext.NPOTSupported) {
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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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assert(surface->format == getRGBAPixelFormat());
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internalFormat = GL_RGBA;
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sourceFormat = GL_UNSIGNED_BYTE;
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} else if (format.bytesPerPixel == 2) {
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internalFormat = GL_RGB;
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sourceFormat = GL_UNSIGNED_SHORT_5_6_5;
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} else
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error("Unknown pixel format");
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glGenTextures(1, &id);
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glBindTexture(GL_TEXTURE_2D, id);
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glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, internalWidth, internalHeight, 0, internalFormat, sourceFormat, 0);
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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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// TODO: If non power of two textures are unavailable this clamping
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// has no effect on the padded sides (resulting in white lines on the edges)
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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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update(surface);
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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::update(const Graphics::Surface *surface) {
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updatePartial(surface, Common::Rect(surface->w, surface->h));
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}
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void OpenGLTexture::updateTexture(const Graphics::Surface* surface, const Common::Rect& rect) {
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assert(surface->format == format);
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glBindTexture(GL_TEXTURE_2D, id);
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if (OpenGLContext.unpackSubImageSupported) {
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const Graphics::Surface subArea = surface->getSubArea(rect);
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glPixelStorei(GL_UNPACK_ROW_LENGTH, surface->pitch / surface->format.bytesPerPixel);
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glTexSubImage2D(GL_TEXTURE_2D, 0, rect.left, rect.top, subArea.w, subArea.h, internalFormat, sourceFormat, subArea.getPixels());
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glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
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} else {
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// GL_UNPACK_ROW_LENGTH is not supported, don't bother and do a full texture update
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, surface->w, surface->h, internalFormat, sourceFormat, surface->getPixels());
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}
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}
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void OpenGLTexture::updatePartial(const Graphics::Surface *surface, const Common::Rect &rect) {
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updateTexture(surface, rect);
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}
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} // End of namespace Myst3
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#endif
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