1

git-svn-id: svn://db.shs.com.ru/libs@1 a8b55f48-bf90-11e4-a774-851b48703e85

qglview/glframebuffer.cpp

@@ -0,0 +1,127 @@
+/*
+    QGLView
+    Copyright (C) 2012  Ivan Pelipenko peri4ko@gmail.com
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "glframebuffer.h"
+
+
+GLFramebuffer::GLFramebuffer(int colorAttachments_, bool withDepth, GLenum colorFormat_, GLenum target__) {
+	is_depth = withDepth;
+	color_format = colorFormat_;
+	target_ = target__;
+	colors.fill(0, colorAttachments_);
+	fbo = drbo = 0;
+	tex_d = 0;
+	wid = hei = 0;
+	is_changed = false;
+}
+
+
+GLFramebuffer::~GLFramebuffer() {
+	deleteGLFramebuffer(fbo);
+	deleteGLRenderbuffer(drbo);
+	for (int i = 0; i < colors.size(); ++i)
+		deleteGLTexture(colors[i]);
+	deleteGLTexture(tex_d);
+}
+
+
+void GLFramebuffer::resize(int width, int height) {
+	wid = width;
+	hei = height;
+	deleteGLFramebuffer(fbo);
+	glGenFramebuffers(1, &fbo);
+	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+	for (int i = 0; i < colors.size(); ++i) {
+		deleteGLTexture(colors[i]);
+		createGLTexture(colors[i], width, height, color_format, target_);
+		glTexParameteri(target_, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTexParameteri(target_, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+		glTexParameteri(target_, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+		glTexParameteri(target_, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+		glTexParameteri(target_, GL_GENERATE_MIPMAP_SGIS, GL_FALSE);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, target_, colors[i], 0);
+	}
+	if (is_depth) {
+		deleteGLTexture(tex_d);
+		deleteGLRenderbuffer(drbo);
+		glGenRenderbuffers(1, &drbo);
+		glBindRenderbuffer(GL_RENDERBUFFER, drbo);
+		glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height);
+		glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, drbo);
+		createGLTexture(tex_d, width, height, GL_DEPTH_COMPONENT);
+		glTexParameteri(target_, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTexParameteri(target_, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+		glTexParameteri(target_, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+		glTexParameteri(target_, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+		glTexParameteri(target_, GL_GENERATE_MIPMAP_SGIS, GL_FALSE);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, target_, tex_d, 0);
+	}
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+	is_changed = false;
+}
+
+
+void GLFramebuffer::bind() {
+	if (is_changed) resize(wid, hei);
+	if (fbo == 0) return;
+	glFlush();
+	glGetIntegerv(GL_VIEWPORT, prev_view);
+	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+	QVector<GLenum> buffers;
+	for (int i = 0; i < colors.size(); ++i)
+		buffers << GL_COLOR_ATTACHMENT0 + i;
+	glDrawBuffers(colors.size(), buffers.constData());
+	glReadBuffer(GL_COLOR_ATTACHMENT0);
+	//glDrawBuffer(GL_COLOR_ATTACHMENT0);
+	glViewport(0, 0, wid, hei);
+}
+
+
+void GLFramebuffer::release() {
+	is_changed = false;
+	if (fbo == 0) return;
+	glFlush();
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+	glViewport(prev_view[0], prev_view[1], prev_view[2], prev_view[3]);
+}
+
+
+void GLFramebuffer::setWriteBuffers(int indeces[]) {
+	QVector<GLenum> buffers;
+	for (uint i = 0; i < sizeof(indeces); ++i)
+		buffers << GL_COLOR_ATTACHMENT0 + indeces[i];
+	glDrawBuffers(colors.size(), buffers.constData());
+}
+
+
+void GLFramebuffer::setWriteBuffers(int * indeces, int count) {
+	QVector<GLenum> buffers;
+	for (int i = 0; i < count; ++i)
+		buffers << GL_COLOR_ATTACHMENT0 + indeces[i];
+	glDrawBuffers(colors.size(), buffers.constData());
+}
+
+
+void GLFramebuffer::bindColorTextures() {
+	for (int i = colors.size() - 1; i >= 0; --i) {
+		glActiveTextureChannel(i);
+		glBindTexture(GL_TEXTURE_2D, colors[i]);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	}
+}