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/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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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 2 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 (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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/****************************************************************************
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History
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$Log: not supported by cvs2svn $
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****************************************************************************/
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#ifndef VCGLIB_GL_SURFACE_H
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#define VCGLIB_GL_SURFACE_H
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#include <vector>
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#include <GL/glew.h>
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namespace vcg
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{
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/****************************************************************************
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The gl_surface class simplify the render-to-texture OpenGL functionality.
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It provides a framebuffer composed of single or multiple color buffers and
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a depth buffer; color-only and depth-only framebuffers can also be created.
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Sample usage:
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****************************************************************
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// *** declaration
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gl_surface my_srf;
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***********************
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// *** initialization: single color render target, with depth buffer
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{
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std::vector<GLenum> color_formats;
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color_formats.push_back(GL_RGBA8);
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my_srf.set(width, height, color_formats, GL_DEPTH_COMPONENT);
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}
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***********************
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***********************
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// *** initialization: two color render targets, without depth buffer
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// NOTE: the maximum number of color targets is implementation dependent.
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// NOTE: DX10 class hardware allows different formats for each color target.
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{
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std::vector<GLenum> color_formats;
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color_formats.push_back(GL_RGBA8);
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color_formats.push_back(GL_RGBA8);
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my_srf.set(width, height, color_formats, GL_NONE);
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}
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***********************
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***********************
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// *** usage: render-to-targets
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{
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my_srf.begin_write();
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application_draw_code();
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my_srf.end_write();
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}
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***********************
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***********************
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// *** usage: using rendered textures
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{
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// 2 buffers
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// bind the second
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glActiveTexture(GL_TEXTURE1);
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my_srf.begin_read_color(1); // actually does a glBindTexture();
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// bind the first
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glActiveTexture(GL_TEXTURE0);
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my_srf.begin_read_color(0);
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application_draw_code();
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// unbind the second
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glActiveTexture(GL_TEXTURE1);
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my_srf.end_read_color(1);
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// unbind first
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glActiveTexture(GL_TEXTURE0);
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my_srf.end_read_color(0);
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}
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***********************
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// *** usage: use depth map
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{
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my_srf.begin_read_depth();
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// use depth map here
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application_draw_code();
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my_srf.end_read_depth();
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}
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***********************
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// *** usage: cleanup
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{
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my_srf.clear();
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// clear() is also safely called in the destructor.
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}
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***********************
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Other commodity methods for getting/setting pixels are also provided.
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****************************************************************************/
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class gl_surface
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{
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public:
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typedef gl_surface this_type;
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gl_surface(void) : width(0), height(0), depth_tex(0), fb(0)
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{
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;
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}
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~gl_surface(void)
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{
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this->clear();
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}
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bool set(int width, int height, const std::vector<GLenum> & color_formats, GLenum depth_format)
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{
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this->clear();
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this->width = width;
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this->height = height;
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this->color_formats = color_formats;
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this->color_texs.resize(color_formats.size());
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for (size_t i=0; i<this->color_texs.size(); ++i)
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{
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glGenTextures (1, &(this->color_texs[i]));
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glBindTexture (GL_TEXTURE_2D, this->color_texs[i]);
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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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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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glTexImage2D (GL_TEXTURE_2D, 0, this->color_formats[i], this->width, this->height, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, 0);
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}
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this->depth_format = depth_format;
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if (this->depth_format != GL_NONE)
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{
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glGenTextures (1, &(this->depth_tex));
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glBindTexture (GL_TEXTURE_2D, this->depth_tex);
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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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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_DEPTH_TEXTURE_MODE_ARB, GL_LUMINANCE);
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glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB, GL_COMPARE_R_TO_TEXTURE_ARB);
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glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC_ARB, GL_LEQUAL);
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glTexImage2D (GL_TEXTURE_2D, 0, this->depth_format, this->width, this->height, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, 0);
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}
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glGenFramebuffersEXT(1, &(this->fb));
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glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, this->fb);
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std::vector<GLenum> sites(this->color_texs.size());
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for (size_t i=0; i<this->color_texs.size(); ++i)
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{
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sites[i] = GL_COLOR_ATTACHMENT0_EXT + i;
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glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, sites[i], GL_TEXTURE_2D, this->color_texs[i], 0);
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}
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if (this->depth_format != GL_NONE)
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{
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glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_2D, this->depth_tex, 0);
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}
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if (!sites.empty())
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{
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glDrawBuffers((GLsizei)(sites.size()), &(sites[0]));
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}
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const GLenum s = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
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const bool res = (s == GL_FRAMEBUFFER_COMPLETE_EXT);
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glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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if (!res)
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{
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glDeleteFramebuffersEXT(1, &(this->fb));
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this->fb = 0;
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for (size_t i=0; i<this->color_texs.size(); ++i)
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{
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glDeleteTextures(1, &(this->color_texs[i]));
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}
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this->color_texs.clear();
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this->color_formats.clear();
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if (this->depth_tex != 0)
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{
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glDeleteTextures(1, &(this->depth_tex));
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this->depth_tex = 0;
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}
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this->width = 0;
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this->height = 0;
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return false;
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}
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return true;
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}
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bool set_simple(int width, int height)
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{
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std::vector<GLenum> c_formats;
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c_formats.push_back(GL_RGBA8);
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return this->set(width, height, c_formats, GL_DEPTH_COMPONENT);
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}
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bool set_color_only(int width, int height, GLenum color_format)
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{
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std::vector<GLenum> c_formats;
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c_formats.push_back(color_format);
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return this->set(width, height, c_formats, GL_NONE);
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}
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bool set_color_only(int width, int height, const std::vector<GLenum> & color_formats)
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{
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return this->set(width, height, color_formats, GL_NONE);
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}
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bool set_depth_only(int width, int height, GLenum depth_format)
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{
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std::vector<GLenum> c_formats;
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return this->set(width, height, c_formats, depth_format);
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}
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bool clear(void)
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{
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if (!this->is_valid()) return false;
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glDeleteFramebuffersEXT(1, &(this->fb));
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this->fb = 0;
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for (size_t i=0; i<this->color_texs.size(); ++i)
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{
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glDeleteTextures(1, &(this->color_texs[i]));
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}
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this->color_texs.clear();
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this->color_formats.clear();
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if (this->depth_tex != 0)
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{
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glDeleteTextures(1, &(this->depth_tex));
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this->depth_tex = 0;
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}
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this->width = 0;
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this->height = 0;
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return true;
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}
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bool is_valid(void) const
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{
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return (this->fb != 0);
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}
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int get_width(void) const
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{
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return this->width;
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}
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int get_height(void) const
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{
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return this->height;
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}
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int color_attachments_count(void) const
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{
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return ((int)(this->color_texs.size()));
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}
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GLenum get_color_attachment_format(int attachment) const
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{
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if (!this->is_valid()) return GL_NONE;
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if ((attachment < 0) || (attachment >= this->color_attachments_count())) return GL_NONE;
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return this->color_formats[attachment];
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}
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bool has_depth_attachment(void) const
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{
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return (this->depth_tex != 0);
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}
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GLenum get_depth_attachment_format(void) const
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{
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if (!this->is_valid()) return GL_NONE;
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if (!this->has_depth_attachment()) return GL_NONE;
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return this->depth_format;
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}
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bool set_color_pixels(int attachment, GLenum format, GLenum type, const void * pixels)
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{
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if (!this->begin_read_color(attachment)) return false;
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glTexImage2D(GL_TEXTURE_2D, 0, this->color_formats[attachment], this->width, this->height, 0, format, type, pixels);
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this->end_read_color(attachment);
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return true;
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}
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bool get_color_pixels(int attachment, GLenum format, GLenum type, void * pixels)
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{
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if (!this->begin_read_color(attachment)) return false;
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glGetTexImage(GL_TEXTURE_2D, 0, format, type, pixels);
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this->end_read_color(attachment);
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return true;
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}
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bool set_depth_pixels(GLenum format, GLenum type, const void * pixels)
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{
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if (!this->is_valid()) return false;
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if (!this->has_depth_attachment()) return false;
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glTexImage2D(GL_TEXTURE_2D, 0, this->depth_format, this->width, this->height, 0, format, type, pixels);
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return true;
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}
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bool get_depth_pixels(GLenum format, GLenum type, void * pixels)
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{
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if (!this->begin_read_depth()) return false;
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glGetTexImage(GL_TEXTURE_2D, 0, format, type, pixels);
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this->end_read_depth();
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return true;
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}
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bool begin_read_color(int attachment)
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{
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if (!this->is_valid()) return false;
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if ((attachment < 0) || (attachment >= this->color_attachments_count())) return false;
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glBindTexture(GL_TEXTURE_2D, this->color_texs[attachment]);
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return true;
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}
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bool end_read_color(int attachment)
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{
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if (!this->is_valid()) return false;
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if ((attachment < 0) || (attachment >= this->color_attachments_count())) return false;
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glBindTexture(GL_TEXTURE_2D, 0);
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return true;
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}
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bool begin_read_depth(void)
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{
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if (!this->is_valid()) return false;
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if (!this->has_depth_attachment()) return false;
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glBindTexture(GL_TEXTURE_2D, this->depth_tex);
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return true;
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}
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bool end_read_depth(void)
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{
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if (!this->is_valid()) return false;
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if (!this->has_depth_attachment()) return false;
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glBindTexture(GL_TEXTURE_2D, 0);
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return true;
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}
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bool begin_write(void)
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{
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if (!this->is_valid()) return false;
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glPushAttrib(GL_VIEWPORT_BIT);
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glViewport(0, 0, this->width, this->height);
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glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, this->fb);
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return true;
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}
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bool end_write(void)
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{
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if (!this->is_valid()) return false;
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glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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glPopAttrib();
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return true;
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}
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bool draw_color_attachment(int x, int y, int width, int height, int attachment)
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{
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if (!this->is_valid()) return false;
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if ((attachment < 0) || (attachment >= this->color_attachments_count())) return false;
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glPushAttrib(GL_ALL_ATTRIB_BITS);
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glViewport(x, y, width, height);
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
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glMatrixMode(GL_PROJECTION);
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glPushMatrix();
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glLoadIdentity();
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glLoadIdentity();
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this->begin_read_color(attachment);
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glBegin(GL_QUADS);
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glTexCoord2f(0.0f, 0.0f); glVertex2f(-1.0f, -1.0f);
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glTexCoord2f(1.0f, 0.0f); glVertex2f( 1.0f, -1.0f);
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glTexCoord2f(1.0f, 1.0f); glVertex2f( 1.0f, 1.0f);
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glTexCoord2f(0.0f, 1.0f); glVertex2f(-1.0f, 1.0f);
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glEnd();
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this->end_read_color(attachment);
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glMatrixMode(GL_PROJECTION);
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glPopMatrix();
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glMatrixMode(GL_MODELVIEW);
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glPopMatrix();
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glPopAttrib();
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}
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bool draw_depth_attachment(int x, int y, int width, int height)
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{
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if (!this->is_valid()) return false;
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if (!this->has_depth_attachment()) return false;
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glPushAttrib(GL_ALL_ATTRIB_BITS);
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glViewport(x, y, width, height);
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
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glMatrixMode(GL_PROJECTION);
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glPushMatrix();
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glLoadIdentity();
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glLoadIdentity();
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this->begin_read_depth();
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glBegin(GL_QUADS);
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glTexCoord2f(0.0f, 0.0f); glVertex2f(-1.0f, -1.0f);
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glTexCoord2f(1.0f, 0.0f); glVertex2f( 1.0f, -1.0f);
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glTexCoord2f(1.0f, 1.0f); glVertex2f( 1.0f, 1.0f);
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glTexCoord2f(0.0f, 1.0f); glVertex2f(-1.0f, 1.0f);
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glEnd();
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this->end_read_depth();
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glMatrixMode(GL_PROJECTION);
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glPopMatrix();
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glMatrixMode(GL_MODELVIEW);
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glPopMatrix();
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glPopAttrib();
|
||||
}
|
||||
|
||||
protected:
|
||||
|
||||
int width;
|
||||
int height;
|
||||
std::vector<GLenum> color_formats;
|
||||
std::vector<GLuint> color_texs;
|
||||
GLenum depth_format;
|
||||
GLuint depth_tex;
|
||||
GLuint fb;
|
||||
};
|
||||
|
||||
} // end namespace vcg
|
||||
|
||||
#endif // VCGLIB_GL_SURFACE_H
|
||||
Loading…
Reference in New Issue