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/**
* $Id$
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* 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. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* 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, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
*/
#include <math.h>
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef WIN32
#include "BLI_winstuff.h"
#endif
#include "MEM_guardedalloc.h"
#include "DNA_vec_types.h"
#include "BIF_gl.h"
#include "BIF_glutil.h"
/* Invert line handling */
#define glToggle(mode, onoff) (((onoff)?glEnable:glDisable)(mode))
static void set_inverted_drawing(int enable)
{
glLogicOp(enable?GL_INVERT:GL_COPY);
/* Use GL_BLEND_EQUATION_EXT on sgi (if we have it),
* apparently GL_COLOR_LOGIC_OP doesn't work on O2?
* Is this an sgi bug or our bug?
*/
#if defined(__sgi) && defined(GL_BLEND_EQUATION_EXT)
glBlendEquationEXT(enable?GL_LOGIC_OP:GL_FUNC_ADD_EXT);
glToggle(GL_BLEND, enable);
#else
glToggle(GL_COLOR_LOGIC_OP, enable);
#endif
glToggle(GL_DITHER, !enable);
}
void sdrawXORline(int x0, int y0, int x1, int y1)
{
if(x0==x1 && y0==y1) return;
set_inverted_drawing(1);
glBegin(GL_LINES);
glVertex2i(x0, y0);
glVertex2i(x1, y1);
glEnd();
set_inverted_drawing(0);
}
void glutil_draw_front_xor_line(int x0, int y0, int x1, int y1)
{
glReadBuffer(GL_FRONT);
glDrawBuffer(GL_FRONT);
sdrawXORline(x0, y0, x1, y1);
glFlush();
glReadBuffer(GL_BACK);
glDrawBuffer(GL_BACK);
}
void sdrawXORline4(int nr, int x0, int y0, int x1, int y1)
{
static short old[4][2][2];
static char flags[4]= {0, 0, 0, 0};
/* with builtin memory, max 4 lines */
set_inverted_drawing(1);
glBegin(GL_LINES);
if(nr== -1) { /* flush */
for (nr=0; nr<4; nr++) {
if (flags[nr]) {
glVertex2sv(old[nr][0]);
glVertex2sv(old[nr][1]);
flags[nr]= 0;
}
}
} else {
if(nr>=0 && nr<4) {
if(flags[nr]) {
glVertex2sv(old[nr][0]);
glVertex2sv(old[nr][1]);
}
old[nr][0][0]= x0;
old[nr][0][1]= y0;
old[nr][1][0]= x1;
old[nr][1][1]= y1;
flags[nr]= 1;
}
glVertex2i(x0, y0);
glVertex2i(x1, y1);
}
glEnd();
set_inverted_drawing(0);
}
void fdrawXORcirc(float xofs, float yofs, float rad)
{
set_inverted_drawing(1);
glPushMatrix();
glTranslatef(xofs, yofs, 0.0);
glutil_draw_lined_arc(0.0, M_PI*2.0, rad, 20);
glPopMatrix();
set_inverted_drawing(0);
}
void glutil_draw_filled_arc(float start, float angle, float radius, int nsegments) {
int i;
glBegin(GL_TRIANGLE_FAN);
glVertex2f(0.0, 0.0);
for (i=0; i<nsegments; i++) {
float t= (float) i/(nsegments-1);
float cur= start + t*angle;
glVertex2f(cos(cur)*radius, sin(cur)*radius);
}
glEnd();
}
void glutil_draw_lined_arc(float start, float angle, float radius, int nsegments) {
int i;
glBegin(GL_LINE_STRIP);
for (i=0; i<nsegments; i++) {
float t= (float) i/(nsegments-1);
float cur= start + t*angle;
glVertex2f(cos(cur)*radius, sin(cur)*radius);
}
glEnd();
}
int glaGetOneInteger(int param)
{
GLint i;
glGetIntegerv(param, &i);
return i;
}
float glaGetOneFloat(int param)
{
GLfloat v;
glGetFloatv(param, &v);
return v;
}
void glaRasterPosSafe2f(float x, float y, float known_good_x, float known_good_y)
{
GLubyte dummy= 0;
/* As long as known good coordinates are correct
* this is guarenteed to generate an ok raster
* position (ignoring potential (real) overflow
* issues).
*/
glRasterPos2f(known_good_x, known_good_y);
/* Now shift the raster position to where we wanted
* it in the first place using the glBitmap trick.
*/
glBitmap(0, 0, 0, 0, x - known_good_x, y - known_good_y, &dummy);
}
static int get_cached_work_texture(int *w_r, int *h_r)
{
static GLint texid= -1;
static int tex_w= 256;
static int tex_h= 256;
if (texid==-1) {
GLint ltexid= glaGetOneInteger(GL_TEXTURE_2D);
unsigned char *tbuf;
glGenTextures(1, &texid);
glBindTexture(GL_TEXTURE_2D, texid);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
tbuf= MEM_callocN(tex_w*tex_h*4, "tbuf");
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, tex_w, tex_h, 0, GL_RGBA, GL_UNSIGNED_BYTE, tbuf);
MEM_freeN(tbuf);
glBindTexture(GL_TEXTURE_2D, ltexid);
}
*w_r= tex_w;
*h_r= tex_h;
return texid;
}
void glaDrawPixelsTex(float x, float y, int img_w, int img_h, void *rect)
{
unsigned char *uc_rect= (unsigned char*) rect;
float xzoom= glaGetOneFloat(GL_ZOOM_X), yzoom= glaGetOneFloat(GL_ZOOM_Y);
int ltexid= glaGetOneInteger(GL_TEXTURE_2D);
int lrowlength= glaGetOneInteger(GL_UNPACK_ROW_LENGTH);
int subpart_x, subpart_y, tex_w, tex_h;
int texid= get_cached_work_texture(&tex_w, &tex_h);
int nsubparts_x= (img_w+(tex_w-1))/tex_w;
int nsubparts_y= (img_h+(tex_h-1))/tex_h;
glPixelStorei(GL_UNPACK_ROW_LENGTH, img_w);
glBindTexture(GL_TEXTURE_2D, texid);
for (subpart_y=0; subpart_y<nsubparts_y; subpart_y++) {
for (subpart_x=0; subpart_x<nsubparts_x; subpart_x++) {
int subpart_w= (subpart_x==nsubparts_x-1)?(img_w-subpart_x*tex_w):tex_w;
int subpart_h= (subpart_y==nsubparts_y-1)?(img_h-subpart_y*tex_h):tex_h;
float rast_x= x+subpart_x*tex_w*xzoom;
float rast_y= y+subpart_y*tex_h*yzoom;
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, subpart_w, subpart_h, GL_RGBA, GL_UNSIGNED_BYTE, &uc_rect[(subpart_y*tex_w)*img_w*4 + (subpart_x*tex_w)*4]);
glColor3ub(255, 255, 255);
glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS);
glTexCoord2f(0, 0);
glVertex2f(rast_x, rast_y);
glTexCoord2f((float) subpart_w/tex_w, 0);
glVertex2f(rast_x+subpart_w*xzoom, rast_y);
glTexCoord2f((float) subpart_w/tex_w, (float) subpart_h/tex_h);
glVertex2f(rast_x+subpart_w*xzoom, rast_y+subpart_h*yzoom);
glTexCoord2f(0, (float) subpart_h/tex_h);
glVertex2f(rast_x, rast_y+subpart_h*yzoom);
glEnd();
glDisable(GL_TEXTURE_2D);
}
}
glBindTexture(GL_TEXTURE_2D, ltexid);
glPixelStorei(GL_UNPACK_ROW_LENGTH, lrowlength);
}
void glaDrawPixelsSafe(float x, float y, int img_w, int img_h, void *rect)
{
unsigned char *uc_rect= (unsigned char*) rect;
float origin_x= 0.375;
float origin_y= 0.375;
/* Trivial case */
if (x>=origin_x && y>=origin_y) {
glRasterPos2f(x, y);
glDrawPixels(img_w, img_h, GL_RGBA, GL_UNSIGNED_BYTE, uc_rect);
} else {
int old_row_length= glaGetOneInteger(GL_UNPACK_ROW_LENGTH);
float xzoom= glaGetOneFloat(GL_ZOOM_X);
float yzoom= glaGetOneFloat(GL_ZOOM_Y);
/* The pixel space coordinate of the intersection of
* the [zoomed] image with the origin.
*/
float ix= (origin_x-x)/xzoom;
float iy= (origin_y-y)/yzoom;
/* The maximum pixel amounts the image can cropped
* without exceeding the origin.
*/
int off_x= floor((ix>origin_x)?ix:origin_x);
int off_y= floor((iy>origin_y)?iy:origin_y);
/* The zoomed space coordinate of the raster
* position.
*/
float rast_x= x + off_x*xzoom;
float rast_y= y + off_y*yzoom;
if (off_x<img_w && off_y<img_h) {
glaRasterPosSafe2f(rast_x, rast_y, origin_x, origin_y);
glPixelStorei(GL_UNPACK_ROW_LENGTH, img_w);
glDrawPixels(img_w-off_x, img_h-off_y, GL_RGBA, GL_UNSIGNED_BYTE, uc_rect+off_y*img_w*4+off_x*4);
glPixelStorei(GL_UNPACK_ROW_LENGTH, old_row_length);
}
}
}
/* 2D Drawing Assistance */
void glaDefine2DArea(rcti *screen_rect)
{
int sc_w= screen_rect->xmax - screen_rect->xmin;
int sc_h= screen_rect->ymax - screen_rect->ymin;
glViewport(screen_rect->xmin, screen_rect->ymin, sc_w, sc_h);
glScissor(screen_rect->xmin, screen_rect->ymin, sc_w, sc_h);
/* The 0.375 magic number is to shift the matrix so that
* both raster and vertex integer coordinates fall at pixel
* centers properly. For a longer discussion see the OpenGL
* Programming Guide, Appendix H, Correctness Tips.
*/
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0, sc_w, 0.0, sc_h, -1, 1);
glTranslatef(0.375, 0.375, 0.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
struct gla2DDrawInfo {
int orig_vp[4], orig_sc[4];
float orig_projmat[16], orig_viewmat[16];
rcti screen_rect;
rctf world_rect;
float wo_to_sc[2];
};
gla2DDrawInfo *glaBegin2DDraw(rcti *screen_rect, rctf *world_rect)
{
gla2DDrawInfo *di= MEM_mallocN(sizeof(*di), "gla2DDrawInfo");
int sc_w, sc_h;
float wo_w, wo_h;
glGetIntegerv(GL_VIEWPORT, (GLint *)di->orig_vp);
glGetIntegerv(GL_SCISSOR_BOX, (GLint *)di->orig_sc);
glGetFloatv(GL_PROJECTION_MATRIX, (GLfloat *)di->orig_projmat);
glGetFloatv(GL_MODELVIEW_MATRIX, (GLfloat *)di->orig_viewmat);
di->screen_rect= *screen_rect;
if (world_rect) {
di->world_rect= *world_rect;
} else {
di->world_rect.xmin= di->screen_rect.xmin;
di->world_rect.ymin= di->screen_rect.ymin;
di->world_rect.xmax= di->screen_rect.xmax;
di->world_rect.ymax= di->screen_rect.ymax;
}
sc_w= (di->screen_rect.xmax-di->screen_rect.xmin);
sc_h= (di->screen_rect.ymax-di->screen_rect.ymin);
wo_w= (di->world_rect.xmax-di->world_rect.xmin);
wo_h= (di->world_rect.ymax-di->world_rect.ymin);
di->wo_to_sc[0]= sc_w/wo_w;
di->wo_to_sc[1]= sc_h/wo_h;
glaDefine2DArea(&di->screen_rect);
return di;
}
void gla2DDrawTranslatePt(gla2DDrawInfo *di, float wo_x, float wo_y, int *sc_x_r, int *sc_y_r)
{
*sc_x_r= (wo_x - di->world_rect.xmin)*di->wo_to_sc[0];
*sc_y_r= (wo_y - di->world_rect.ymin)*di->wo_to_sc[1];
}
void gla2DDrawTranslatePtv(gla2DDrawInfo *di, float world[2], int screen_r[2])
{
screen_r[0]= (world[0] - di->world_rect.xmin)*di->wo_to_sc[0];
screen_r[1]= (world[1] - di->world_rect.ymin)*di->wo_to_sc[1];
}
void glaEnd2DDraw(gla2DDrawInfo *di)
{
glViewport(di->orig_vp[0], di->orig_vp[1], di->orig_vp[2], di->orig_vp[3]);
glScissor(di->orig_vp[0], di->orig_vp[1], di->orig_vp[2], di->orig_vp[3]);
glMatrixMode(GL_PROJECTION);
glLoadMatrixf(di->orig_projmat);
glMatrixMode(GL_MODELVIEW);
glLoadMatrixf(di->orig_viewmat);
MEM_freeN(di);
}
/* **************** glPoint hack ************************ */
static int curmode=0;
static int pointhack=0;
static GLubyte Squaredot[16] = { 0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff};
void bglBegin(int mode)
{
curmode= mode;
if(mode==GL_POINTS) {
float value[4];
glGetFloatv(GL_POINT_SIZE_RANGE, value);
if(value[1]<2.0) {
glGetFloatv(GL_POINT_SIZE, value);
pointhack= floor(value[0]+0.5);
if(pointhack>4) pointhack= 4;
}
else glBegin(mode);
}
}
void bglVertex3fv(float *vec)
{
switch(curmode) {
case GL_POINTS:
if(pointhack) {
glRasterPos3fv(vec);
glBitmap(pointhack, pointhack, (float)pointhack/2.0, (float)pointhack/2.0, 0.0, 0.0, Squaredot);
}
else glVertex3fv(vec);
break;
}
}
void bglVertex2fv(float *vec)
{
switch(curmode) {
case GL_POINTS:
if(pointhack) {
glRasterPos2fv(vec);
glBitmap(pointhack, pointhack, (float)pointhack/2, pointhack/2, 0.0, 0.0, Squaredot);
}
else glVertex2fv(vec);
break;
}
}
void bglEnd(void)
{
if(pointhack) pointhack= 0;
else glEnd();
}
/* *************** glPolygonOffset hack ************* */
// both temporal, so here for now (ton)
#include "BKE_global.h"
#include "DNA_view3d_types.h"
/* dist is only for ortho now... */
void bglPolygonOffset(float dist)
{
static float winmat[16], offset=0.0;
if(dist!=0.0) {
float offs;
// glEnable(GL_POLYGON_OFFSET_FILL);
// glPolygonOffset(-1.0, -1.0);
/* hack below is to mimic polygon offset */
glMatrixMode(GL_PROJECTION);
glGetFloatv(GL_PROJECTION_MATRIX, (float *)winmat);
/* dist is from camera to center point */
if(winmat[15]>0.5) offs= 0.00001*dist*G.vd->dist; // ortho tweaking
else offs= 0.0005*dist; // should be clipping value or so...
winmat[14]-= offs;
offset+= offs;
glLoadMatrixf(winmat);
glMatrixMode(GL_MODELVIEW);
}
else {
glMatrixMode(GL_PROJECTION);
winmat[14]+= offset;
offset= 0.0;
glLoadMatrixf(winmat);
glMatrixMode(GL_MODELVIEW);
}
}
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