vcglib/wrap/gl/gl_surface.h

539 lines
14 KiB
C++

/****************************************************************************
* VCGLib o o *
* Visual and Computer Graphics Library o o *
* _ O _ *
* Copyright(C) 2004-2016 \/)\/ *
* Visual Computing Lab /\/| *
* ISTI - Italian National Research Council | *
* \ *
* All rights reserved. *
* *
* 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 2 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 (http://www.gnu.org/licenses/gpl.txt) *
* for more details. *
* *
****************************************************************************/
/****************************************************************************
History
$Log: not supported by cvs2svn $
Revision 1.1 2007/07/26 16:22:47 m_di_benedetto
First Commit.
****************************************************************************/
#ifndef VCGLIB_GL_SURFACE_H
#define VCGLIB_GL_SURFACE_H
#include <vector>
#include <GL/glew.h>
namespace vcg
{
/****************************************************************************
The gl_surface class simplify the render-to-texture OpenGL functionality.
It provides a framebuffer composed of single or multiple color buffers and
a depth buffer; color-only and depth-only framebuffers can also be created.
Sample usage:
****************************************************************
// *** declaration
gl_surface my_srf;
***********************
// *** initialization: single color render target, with depth buffer
{
std::vector<GLenum> color_formats;
color_formats.push_back(GL_RGBA8);
my_srf.set(width, height, color_formats, GL_DEPTH_COMPONENT);
}
***********************
***********************
// *** initialization: two color render targets, without depth buffer
// NOTE: the maximum number of color targets is implementation dependent.
// NOTE: DX10 class hardware allows different formats for each color target.
{
std::vector<GLenum> color_formats;
color_formats.push_back(GL_RGBA8);
color_formats.push_back(GL_RGBA8);
my_srf.set(width, height, color_formats, GL_NONE);
}
***********************
***********************
// *** usage: render-to-targets
{
my_srf.begin_write();
application_draw_code();
my_srf.end_write();
}
***********************
***********************
// *** usage: using rendered textures
{
// 2 buffers
// bind the second
glActiveTexture(GL_TEXTURE1);
my_srf.begin_read_color(1); // actually does a glBindTexture();
// bind the first
glActiveTexture(GL_TEXTURE0);
my_srf.begin_read_color(0);
application_draw_code();
// unbind the second
glActiveTexture(GL_TEXTURE1);
my_srf.end_read_color(1);
// unbind first
glActiveTexture(GL_TEXTURE0);
my_srf.end_read_color(0);
}
***********************
// *** usage: use depth map
{
my_srf.begin_read_depth();
// use depth map here
application_draw_code();
my_srf.end_read_depth();
}
***********************
// *** usage: cleanup
{
my_srf.clear();
// clear() is also safely called in the destructor.
}
***********************
Other commodity methods for getting/setting pixels are also provided.
****************************************************************************/
class gl_surface
{
public:
typedef gl_surface this_type;
gl_surface(void) : width(0), height(0), depth_tex(0), fb(0)
{
;
}
~gl_surface(void)
{
this->clear();
}
bool set(int width, int height, const std::vector<GLenum> & color_formats, GLenum depth_format)
{
this->clear();
this->width = width;
this->height = height;
this->color_formats = color_formats;
this->color_texs.resize(color_formats.size());
for (size_t i=0; i<this->color_texs.size(); ++i)
{
glGenTextures (1, &(this->color_texs[i]));
glBindTexture (GL_TEXTURE_2D, this->color_texs[i]);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D (GL_TEXTURE_2D, 0, this->color_formats[i], this->width, this->height, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, 0);
}
this->depth_format = depth_format;
if (this->depth_format != GL_NONE)
{
glGenTextures (1, &(this->depth_tex));
glBindTexture (GL_TEXTURE_2D, this->depth_tex);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE_ARB, GL_LUMINANCE);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB, GL_COMPARE_R_TO_TEXTURE_ARB);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC_ARB, GL_LEQUAL);
glTexImage2D (GL_TEXTURE_2D, 0, this->depth_format, this->width, this->height, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, 0);
}
glGenFramebuffersEXT(1, &(this->fb));
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, this->fb);
std::vector<GLenum> sites(this->color_texs.size());
for (size_t i=0; i<this->color_texs.size(); ++i)
{
sites[i] = GL_COLOR_ATTACHMENT0_EXT + ((GLenum)i);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, sites[i], GL_TEXTURE_2D, this->color_texs[i], 0);
}
if (this->depth_format != GL_NONE)
{
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_2D, this->depth_tex, 0);
}
if (!sites.empty())
{
glDrawBuffers((GLsizei)(sites.size()), &(sites[0]));
}
const GLenum s = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
const bool res = (s == GL_FRAMEBUFFER_COMPLETE_EXT);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
if (!res)
{
glDeleteFramebuffersEXT(1, &(this->fb));
this->fb = 0;
for (size_t i=0; i<this->color_texs.size(); ++i)
{
glDeleteTextures(1, &(this->color_texs[i]));
}
this->color_texs.clear();
this->color_formats.clear();
if (this->depth_tex != 0)
{
glDeleteTextures(1, &(this->depth_tex));
this->depth_tex = 0;
}
this->width = 0;
this->height = 0;
return false;
}
return true;
}
bool set_simple(int width, int height)
{
std::vector<GLenum> c_formats;
c_formats.push_back(GL_RGBA8);
return this->set(width, height, c_formats, GL_DEPTH_COMPONENT);
}
bool set_color_only(int width, int height, GLenum color_format)
{
std::vector<GLenum> c_formats;
c_formats.push_back(color_format);
return this->set(width, height, c_formats, GL_NONE);
}
bool set_color_only(int width, int height, const std::vector<GLenum> & color_formats)
{
return this->set(width, height, color_formats, GL_NONE);
}
bool set_depth_only(int width, int height, GLenum depth_format)
{
std::vector<GLenum> c_formats;
return this->set(width, height, c_formats, depth_format);
}
bool clear(void)
{
if (!this->is_valid()) return false;
glDeleteFramebuffersEXT(1, &(this->fb));
this->fb = 0;
for (size_t i=0; i<this->color_texs.size(); ++i)
{
glDeleteTextures(1, &(this->color_texs[i]));
}
this->color_texs.clear();
this->color_formats.clear();
if (this->depth_tex != 0)
{
glDeleteTextures(1, &(this->depth_tex));
this->depth_tex = 0;
}
this->width = 0;
this->height = 0;
return true;
}
bool is_valid(void) const
{
return (this->fb != 0);
}
int get_width(void) const
{
return this->width;
}
int get_height(void) const
{
return this->height;
}
int color_attachments_count(void) const
{
return ((int)(this->color_texs.size()));
}
GLenum get_color_attachment_format(int attachment) const
{
if (!this->is_valid()) return GL_NONE;
if ((attachment < 0) || (attachment >= this->color_attachments_count())) return GL_NONE;
return this->color_formats[attachment];
}
bool has_depth_attachment(void) const
{
return (this->depth_tex != 0);
}
GLenum get_depth_attachment_format(void) const
{
if (!this->is_valid()) return GL_NONE;
if (!this->has_depth_attachment()) return GL_NONE;
return this->depth_format;
}
bool set_color_pixels(int attachment, GLenum format, GLenum type, const void * pixels)
{
if (!this->begin_read_color(attachment)) return false;
glTexImage2D(GL_TEXTURE_2D, 0, this->color_formats[attachment], this->width, this->height, 0, format, type, pixels);
this->end_read_color(attachment);
return true;
}
bool get_color_pixels(int attachment, GLenum format, GLenum type, void * pixels)
{
if (!this->begin_read_color(attachment)) return false;
glGetTexImage(GL_TEXTURE_2D, 0, format, type, pixels);
this->end_read_color(attachment);
return true;
}
bool set_depth_pixels(GLenum format, GLenum type, const void * pixels)
{
if (!this->is_valid()) return false;
if (!this->has_depth_attachment()) return false;
glTexImage2D(GL_TEXTURE_2D, 0, this->depth_format, this->width, this->height, 0, format, type, pixels);
return true;
}
bool get_depth_pixels(GLenum format, GLenum type, void * pixels)
{
if (!this->begin_read_depth()) return false;
glGetTexImage(GL_TEXTURE_2D, 0, format, type, pixels);
this->end_read_depth();
return true;
}
bool begin_read_color(int attachment)
{
if (!this->is_valid()) return false;
if ((attachment < 0) || (attachment >= this->color_attachments_count())) return false;
glBindTexture(GL_TEXTURE_2D, this->color_texs[attachment]);
return true;
}
bool end_read_color(int attachment)
{
if (!this->is_valid()) return false;
if ((attachment < 0) || (attachment >= this->color_attachments_count())) return false;
glBindTexture(GL_TEXTURE_2D, 0);
return true;
}
bool begin_read_depth(void)
{
if (!this->is_valid()) return false;
if (!this->has_depth_attachment()) return false;
glBindTexture(GL_TEXTURE_2D, this->depth_tex);
return true;
}
bool end_read_depth(void)
{
if (!this->is_valid()) return false;
if (!this->has_depth_attachment()) return false;
glBindTexture(GL_TEXTURE_2D, 0);
return true;
}
bool begin_write(void)
{
if (!this->is_valid()) return false;
glPushAttrib(GL_VIEWPORT_BIT);
glViewport(0, 0, this->width, this->height);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, this->fb);
return true;
}
bool end_write(void)
{
if (!this->is_valid()) return false;
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glPopAttrib();
return true;
}
bool draw_color_attachment(int x, int y, int width, int height, int attachment)
{
if (!this->is_valid()) return false;
if ((attachment < 0) || (attachment >= this->color_attachments_count())) return false;
glPushAttrib(GL_ALL_ATTRIB_BITS);
glViewport(x, y, width, height);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
this->begin_read_color(attachment);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex2f(-1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex2f( 1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex2f( 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex2f(-1.0f, 1.0f);
glEnd();
this->end_read_color(attachment);
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glPopAttrib();
return true;
}
bool draw_depth_attachment(int x, int y, int width, int height)
{
if (!this->is_valid()) return false;
if (!this->has_depth_attachment()) return false;
glPushAttrib(GL_ALL_ATTRIB_BITS);
glViewport(x, y, width, height);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
this->begin_read_depth();
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex2f(-1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex2f( 1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex2f( 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex2f(-1.0f, 1.0f);
glEnd();
this->end_read_depth();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glPopAttrib();
return true;
}
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