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/*
Copyright (C) 2011 ezQuake team
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 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/>.
*/
#if defined(FRAMEBUFFERS)
// Loads and does all the framebuffer stuff
#include "quakedef.h"
#include "gl_framebuffer.h"
cvar_t framebuffer = {"framebuffer", "0"};
/*
cvar_t fb_width = {"fb_width","0"};
cvar_t fb_height = {"fb_height","0"};
cvar_t fb_ratio_w = {"fb_ratio_w","0"};
cvar_t fb_ratio_h = {"fb_ratio_h","0"};
cvar_t fb_x = {"fb_x","0"};
cvar_t fb_y = {"fb_y","0"};
*/
fb_t main_fb; // The main framebuffer that can be used generally to draw things offscreen.
qbool use_framebuffer = false;
//
// EXT_framebuffer_object - http://oss.sgi.com/projects/ogl-sample/registry/EXT/framebuffer_object.txt
//
extern PFNGLISRENDERBUFFEREXTPROC glIsRenderbufferEXT = NULL; // boolean IsRenderbufferEXT(uint renderbuffer);
extern PFNGLBINDRENDERBUFFEREXTPROC glBindRenderbufferEXT = NULL; // void BindRenderbufferEXT(enum target, uint renderbuffer);
extern PFNGLDELETERENDERBUFFERSEXTPROC glDeleteRenderbuffersEXT = NULL; // void DeleteRenderbuffersEXT(sizei n, const uint *renderbuffers);
extern PFNGLGENRENDERBUFFERSEXTPROC glGenRenderbuffersEXT = NULL; // void GenRenderbuffersEXT(sizei n, uint *renderbuffers);
extern PFNGLRENDERBUFFERSTORAGEEXTPROC glRenderbufferStorageEXT = NULL; // void RenderbufferStorageEXT(enum target, enum internalformat, sizei width, sizei height);
extern PFNGLGETRENDERBUFFERPARAMETERIVEXTPROC glGetRenderbufferParameterivEXT = NULL; // void GetRenderbufferParameterivEXT(enum target, enum pname, int *params);
extern PFNGLISFRAMEBUFFEREXTPROC glIsFramebufferEXT = NULL; // boolean IsFramebufferEXT(uint framebuffer);
extern PFNGLBINDFRAMEBUFFEREXTPROC glBindFramebufferEXT = NULL; // void BindFramebufferEXT(enum target, uint framebuffer);
extern PFNGLDELETEFRAMEBUFFERSEXTPROC glDeleteFramebuffersEXT = NULL; // void DeleteFramebuffersEXT(sizei n, const uint *framebuffers);
extern PFNGLGENFRAMEBUFFERSEXTPROC glGenFramebuffersEXT = NULL; // void GenFramebuffersEXT(sizei n, uint *framebuffers)
extern PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC glCheckFramebufferStatusEXT = NULL; // enum CheckFramebufferStatusEXT(enum target);
extern PFNGLFRAMEBUFFERTEXTURE1DEXTPROC glFramebufferTexture1DEXT = NULL; // void FramebufferTexture1DEXT(enum target, enum attachment, enum textarget, uint texture, int level);
extern PFNGLFRAMEBUFFERTEXTURE2DEXTPROC glFramebufferTexture2DEXT = NULL; // void FramebufferTexture2DEXT(enum target, enum attachment, enum textarget, uint texture, int level);
extern PFNGLFRAMEBUFFERTEXTURE3DEXTPROC glFramebufferTexture3DEXT = NULL; // void FramebufferTexture3DEXT(enum target, enum attachment, enum textarget, uint texture, int level, int zoffset);
extern PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC glFramebufferRenderbufferEXT = NULL; // void FramebufferRenderbufferEXT(enum target, enum attachment, enum renderbuffertarget, uint renderbuffer);
extern PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC glGetFramebufferAttachmentParameterivEXT = NULL; // void GetFramebufferAttachmentParameterivEXT(enum target, enum attachment, enum pname, int *params);
extern PFNGLGENERATEMIPMAPEXTPROC glGenerateMipmapEXT = NULL; // void GenerateMipmapEXT(enum target);
// GL_ARB_multitexture.
extern PFNGLACTIVETEXTUREARBPROC glActiveTextureEXT = NULL;
extern PFNGLCLIENTACTIVETEXTUREARBPROC glClientActiveTextureEXT = NULL;
extern PFNGLMULTITEXCOORD2FARBPROC glMultiTexCoord2fEXT = NULL;
//
// Initialize framebuffer stuff, Loads procadresses and such.
//
void Framebuffer_Init (void)
{
char *ext = (char*)qglGetString( GL_EXTENSIONS );
// int temp;
// FIXME: alredy initialized, what to do?
// doubt this will work on vid_restart...
if (use_framebuffer)
{
return;
}
/* wtf, and a bit later set to use_framebuffer = true;
if ((temp = COM_CheckParm("-framebuffer")) && temp + 1 < COM_Argc())
{
use_framebuffer = Q_atoi(COM_Argv(temp+1));
}
*/
// Check if the driver supports framebuffers.
if( strstr( ext, "EXT_framebuffer_object" ) == NULL || !strstr(ext, "GL_ARB_multitexture"))
{
Com_Printf("Framebuffer extension is not supported by your driver/graphics card.\n");
use_framebuffer = false;
}
else
{
//
// Get the procedure adresses for the frame buffer functions.
//
use_framebuffer = true;
Com_Printf("Framebuffer extension do exist \n");
glIsRenderbufferEXT = (PFNGLISRENDERBUFFEREXTPROC)wglGetProcAddress("glIsRenderbufferEXT");
glBindRenderbufferEXT = (PFNGLBINDRENDERBUFFEREXTPROC)wglGetProcAddress("glBindRenderbufferEXT");
glDeleteRenderbuffersEXT = (PFNGLDELETERENDERBUFFERSEXTPROC)wglGetProcAddress("glDeleteRenderbuffersEXT");
glGenRenderbuffersEXT = (PFNGLGENRENDERBUFFERSEXTPROC)wglGetProcAddress("glGenRenderbuffersEXT");
glRenderbufferStorageEXT = (PFNGLRENDERBUFFERSTORAGEEXTPROC)wglGetProcAddress("glRenderbufferStorageEXT");
glGetRenderbufferParameterivEXT = (PFNGLGETRENDERBUFFERPARAMETERIVEXTPROC)wglGetProcAddress("glGetRenderbufferParameterivEXT");
glIsFramebufferEXT = (PFNGLISFRAMEBUFFEREXTPROC)wglGetProcAddress("glIsFramebufferEXT");
glBindFramebufferEXT = (PFNGLBINDFRAMEBUFFEREXTPROC)wglGetProcAddress("glBindFramebufferEXT");
glDeleteFramebuffersEXT = (PFNGLDELETEFRAMEBUFFERSEXTPROC)wglGetProcAddress("glDeleteFramebuffersEXT");
glGenFramebuffersEXT = (PFNGLGENFRAMEBUFFERSEXTPROC)wglGetProcAddress("glGenFramebuffersEXT");
glCheckFramebufferStatusEXT = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC)wglGetProcAddress("glCheckFramebufferStatusEXT");
glFramebufferTexture1DEXT = (PFNGLFRAMEBUFFERTEXTURE1DEXTPROC)wglGetProcAddress("glFramebufferTexture1DEXT");
glFramebufferTexture2DEXT = (PFNGLFRAMEBUFFERTEXTURE2DEXTPROC)wglGetProcAddress("glFramebufferTexture2DEXT");
glFramebufferTexture3DEXT = (PFNGLFRAMEBUFFERTEXTURE3DEXTPROC)wglGetProcAddress("glFramebufferTexture3DEXT");
glFramebufferRenderbufferEXT = (PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC)wglGetProcAddress("glFramebufferRenderbufferEXT");
glGetFramebufferAttachmentParameterivEXT = (PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC)wglGetProcAddress("glGetFramebufferAttachmentParameterivEXT");
glGenerateMipmapEXT = (PFNGLGENERATEMIPMAPEXTPROC)wglGetProcAddress("glGenerateMipmapEXT");
glActiveTextureEXT = (PFNGLACTIVETEXTUREARBPROC)wglGetProcAddress("glActiveTextureARB");
glClientActiveTextureEXT = (PFNGLCLIENTACTIVETEXTUREARBPROC)wglGetProcAddress("glClientActiveTextureARB");
glMultiTexCoord2fEXT = (PFNGLMULTITEXCOORD2FARBPROC)wglGetProcAddress("glMultiTexCoord2fARB");
//
// Make sure we find them all.
//
if( !glIsRenderbufferEXT || !glBindRenderbufferEXT || !glDeleteRenderbuffersEXT ||
!glGenRenderbuffersEXT || !glRenderbufferStorageEXT || !glGetRenderbufferParameterivEXT ||
!glIsFramebufferEXT || !glBindFramebufferEXT || !glDeleteFramebuffersEXT ||
!glGenFramebuffersEXT || !glCheckFramebufferStatusEXT || !glFramebufferTexture1DEXT ||
!glFramebufferTexture2DEXT || !glFramebufferTexture3DEXT || !glFramebufferRenderbufferEXT||
!glGetFramebufferAttachmentParameterivEXT || !glGenerateMipmapEXT )
{
Com_Printf("Couldnt get the function addresses for framebuffer support.\n");
use_framebuffer = false;
return;
}
/*
Cmd_AddCommand("framebuffer_load", Framebuffer_Main_Init);
Cvar_Register(&fb_width);
Cvar_Register(&fb_height);
Cvar_Register(&fb_ratio_w);
Cvar_Register(&fb_ratio_h);
Cvar_Register(&fb_x);
Cvar_Register(&fb_y);
*/
// FIXME: which group we belong?
Cvar_Register(&framebuffer);
}
}
//
// Disable drawing to a framebuffer.
//
void Framebuffer_Disable (fb_t *fbs)
{
if (!framebuffer.value)
{
return;
}
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
}
//
// Enable drawing to a framebuffer.
//
void Framebuffer_Enable (fb_t *fbs)
{
if (!framebuffer.value)
{
return;
}
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbs->frame_buffer);
}
//
// Create a framebuffer object.
//
void Framebuffer_Create (fb_t *fbs)
{
GLenum status;
extern RECT window_rect;
// Frame buffers not supported.
if (!use_framebuffer)
{
return;
}
// Set the texture specs.
if (!fbs->texture)
{
extern int texture_extension_number;
// Make sure the texture resolution is a power of 2.
Q_ROUND_POWER2(window_rect.right - window_rect.left, fbs->width);
Q_ROUND_POWER2(window_rect.bottom - window_rect.top, fbs->height);
if (fbs->width < main_fb.height)
{
fbs->width = main_fb.height;
}
else
{
main_fb.height = main_fb.width;
}
fbs->texture = texture_extension_number++;
fbs->depthtex = texture_extension_number++;
fbs->realwidth = (int)(window_rect.right - window_rect.left);
fbs->realheight = (int)(window_rect.bottom - window_rect.top);
fbs->ratio_h = (float) fbs->realheight / fbs->height;
fbs->ratio_w = (float) fbs->realwidth / fbs->width;
fbs->x = 0;
fbs->y = 0;
}
// Generate framebuffer.
glGenFramebuffersEXT(1, &fbs->frame_buffer);
// Generate depthbuffer.
glGenRenderbuffersEXT(1, &fbs->depth_buffer);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbs->frame_buffer);
// Initializing the texture.
glBindTexture(GL_TEXTURE_2D, fbs->texture);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, fbs->width, fbs->height, 0, GL_RGB, GL_FLOAT, NULL);
glTexImage2D(GL_TEXTURE_2D, 0, 4, fbs->width, fbs->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, fbs->texture, 0);
// Initializing the depthbuffer.
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, fbs->depth_buffer);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24, fbs->width, fbs->height);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, fbs->depth_buffer);
status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
switch (status)
{
case GL_FRAMEBUFFER_COMPLETE_EXT:
Com_Printf("Frame buffer configuration supported\n");
break;
case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
Com_Printf("Frame buffer configuration unsupported\n");
return ;
default:
Com_Printf("Error\n");
return ;
}
// Unbind the frame buffer so that we dont draw to it accidentally.
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0);
}
//
// Initializes the main frame buffer object, which can be reused
// in several places. Use Framebuffer_Create(...) and create a new
// buffer for specialized use.
//
void Framebuffer_Main_Init (void)
{
if (!use_framebuffer)
{
return;
}
if (main_fb.texture != 0)
{
return;
}
Framebuffer_Create(&main_fb);
}
//
// Draws the specified frame buffer object onto a polygon
// with the coordinates / bounds specified in it.
//
void Framebuffer_Draw (fb_t *fbs)
{
if (!framebuffer.value)
{
return;
}
GL_Bind(fbs->texture);
glBegin (GL_QUADS);
// Top left corner.
glTexCoord2f (0, 0);
glVertex2f (fbs->x, fbs->y + fbs->realheight);
// Upper right corner.
glTexCoord2f (fbs->ratio_w, 0);
glVertex2f (fbs->x + fbs->realwidth, fbs->y + fbs->realheight);
// Bottom right corner.
glTexCoord2f (fbs->ratio_w, fbs->ratio_h);
glVertex2f (fbs->x + fbs->realwidth, fbs->y);
// Bottom left corner.
glTexCoord2f (0, fbs->ratio_h);
glVertex2f (fbs->x, fbs->y);
glEnd();
}
#endif // FRAMEBUFFERS
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