123 lines
3.6 KiB
C++
123 lines
3.6 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/openglbitmap.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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OpenGlBitmap::OpenGlBitmap() :
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Bitmap(),
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_id(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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OpenGlBitmap::~OpenGlBitmap() {
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glDeleteTextures(1, &_id);
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}
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void OpenGlBitmap::bind() const {
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glBindTexture(GL_TEXTURE_2D, _id);
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}
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void OpenGlBitmap::update(const Graphics::Surface *surface, const byte *palette) {
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bind();
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const Graphics::Surface *rgbaSurface = surface;
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if (surface->format != Driver::getRGBAPixelFormat()) {
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// Convert the surface to texture format
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rgbaSurface = surface->convertTo(Driver::getRGBAPixelFormat(), palette);
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}
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_width = rgbaSurface->w;
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_height = rgbaSurface->h;
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GLfloat s, t;
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if (!OpenGLContext.NPOTSupported) {
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uint32 texWidth = Common::nextHigher2(rgbaSurface->w);
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uint32 texHeight = Common::nextHigher2(rgbaSurface->h);
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s = (GLfloat)_width / texWidth;
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t = (GLfloat)_height / texHeight;
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth, texHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, rgbaSurface->w, rgbaSurface->h,
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GL_RGBA, GL_UNSIGNED_BYTE, rgbaSurface->getPixels());
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} else {
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s = t = 1.f;
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, rgbaSurface->w, rgbaSurface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, rgbaSurface->getPixels());
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}
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_texCoords[0*2+0] = 0.0f;
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_texCoords[0*2+1] = 0.0f;
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_texCoords[1*2+0] = s;
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_texCoords[1*2+1] = 0.0f;
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_texCoords[2*2+0] = 0.0f;
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_texCoords[2*2+1] = t;
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_texCoords[3*2+0] = s;
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_texCoords[3*2+1] = t;
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if (rgbaSurface != surface) {
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const_cast<Graphics::Surface *>(rgbaSurface)->free();
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delete rgbaSurface;
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}
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}
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void OpenGlBitmap::setSamplingFilter(Bitmap::SamplingFilter filter) {
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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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Graphics::PixelFormat OpenGlBitmap::getBestPixelFormat() const {
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return Driver::getRGBAPixelFormat();
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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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