144 lines
4.5 KiB
C++
144 lines
4.5 KiB
C++
/*
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QGLView
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Copyright (C) 2017 Ivan Pelipenko peri4ko@yandex.ru
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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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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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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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#include "glframebuffer.h"
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GLFramebuffer::GLFramebuffer(int colorAttachments_, bool withDepth, GLenum colorFormat_, GLenum target__) {
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is_depth = withDepth;
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color_format = colorFormat_;
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target_ = target__;
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colors.fill(0, colorAttachments_);
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fbo = drbo = 0;
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tex_d = 0;
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wid = hei = 0;
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is_changed = false;
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}
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GLFramebuffer::~GLFramebuffer() {
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deleteGLFramebuffer(fbo);
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deleteGLRenderbuffer(drbo);
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for (int i = 0; i < colors.size(); ++i)
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deleteGLTexture(colors[i]);
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deleteGLTexture(tex_d);
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}
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void GLFramebuffer::resize(int width, int height, bool force) {
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if ((wid == width) && (hei == height) && !force) return;
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wid = width;
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hei = height;
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deleteGLFramebuffer(fbo);
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glGenFramebuffers(1, &fbo);
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glBindFramebuffer(GL_FRAMEBUFFER, fbo);
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for (int i = 0; i < colors.size(); ++i) {
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deleteGLTexture(colors[i]);
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createGLTexture(colors[i], width, height, color_format, target_);
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glTexParameteri(target_, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(target_, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(target_, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(target_, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(target_, GL_TEXTURE_MAX_LEVEL, 4);
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glTexParameteri(target_, GL_GENERATE_MIPMAP_SGIS, GL_FALSE);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, target_, colors[i], 0);
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}
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if (is_depth) {
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deleteGLTexture(tex_d);
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deleteGLRenderbuffer(drbo);
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glGenRenderbuffers(1, &drbo);
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glBindRenderbuffer(GL_RENDERBUFFER, drbo);
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glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, drbo);
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createGLTexture(tex_d, width, height, GL_DEPTH_COMPONENT);
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glTexParameteri(target_, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(target_, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(target_, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(target_, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(target_, GL_GENERATE_MIPMAP_SGIS, GL_FALSE);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, target_, tex_d, 0);
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}
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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is_changed = false;
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}
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QImage GLFramebuffer::grab() const {
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//glReadPixels(0, 0, wid, hei, GL_RGBA, );
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//QImage ret();
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return QImage();
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}
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void GLFramebuffer::bind() {
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if (is_changed) resize(wid, hei);
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if (fbo == 0) return;
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glFlush();
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glGetIntegerv(GL_VIEWPORT, prev_view);
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//glClearError();
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glBindFramebuffer(GL_FRAMEBUFFER, fbo);
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//qDebug() << QString::number(glGetError(), 16);
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QVector<GLenum> buffers;
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for (int i = 0; i < colors.size(); ++i)
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buffers << GL_COLOR_ATTACHMENT0 + i;
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glDrawBuffers(buffers.size(), buffers.constData());
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glReadBuffer(GL_COLOR_ATTACHMENT0);
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//glDrawBuffer(GL_COLOR_ATTACHMENT0);
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glViewport(0, 0, wid, hei);
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}
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void GLFramebuffer::release() {
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is_changed = false;
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if (fbo == 0) return;
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glFlush();
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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glViewport(prev_view[0], prev_view[1], prev_view[2], prev_view[3]);
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}
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void GLFramebuffer::setWriteBuffer(int index) {
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//QVector<GLenum> buffers; buffers << GL_COLOR_ATTACHMENT0 + index;
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glDrawBuffer(GL_COLOR_ATTACHMENT0 + index);
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//glDrawBuffers(buffers.size(), buffers.constData());
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}
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void GLFramebuffer::setWriteBuffers(int * indeces, int count) {
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QVector<GLenum> buffers;
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for (int i = 0; i < count; ++i)
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buffers << GL_COLOR_ATTACHMENT0 + indeces[i];
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glDrawBuffers(buffers.size(), buffers.constData());
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}
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void GLFramebuffer::bindColorTextures() {
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for (int i = colors.size() - 1; i >= 0; --i) {
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glActiveTextureChannel(i);
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glBindTexture(GL_TEXTURE_2D, colors[i]);
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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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}
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}
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void GLFramebuffer::bindDepthTexture(int channel) {
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glActiveTextureChannel(channel);
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glBindTexture(GL_TEXTURE_2D, tex_d);
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}
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