drawvolume.c

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/*
 * ***** BEGIN GPL 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.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * Contributor(s): Daniel Genrich
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <string.h>
#include <math.h>

#include "MEM_guardedalloc.h"

#include "DNA_scene_types.h"
#include "DNA_screen_types.h"
#include "DNA_view3d_types.h"

#include "BLI_blenlib.h"
#include "BLI_math.h"
#include "BLI_editVert.h"
#include "BLI_edgehash.h"
#include "BLI_rand.h"
#include "BLI_utildefines.h"

#include "BKE_curve.h"
#include "BKE_constraint.h" // for the get_constraint_target function
#include "BKE_DerivedMesh.h"
#include "BKE_deform.h"
#include "BKE_displist.h"
#include "BKE_effect.h"
#include "BKE_font.h"
#include "BKE_global.h"
#include "BKE_image.h"
#include "BKE_key.h"
#include "BKE_lattice.h"
#include "BKE_mesh.h"
#include "BKE_material.h"
#include "BKE_mball.h"
#include "BKE_modifier.h"
#include "BKE_object.h"
#include "BKE_paint.h"
#include "BKE_particle.h"
#include "BKE_property.h"
#include "BKE_smoke.h"

#include "smoke_API.h"

#include "BIF_gl.h"

#include "GPU_extensions.h"

#include "ED_mesh.h"


#include "BLF_api.h"


#include "view3d_intern.h"  // own include


#ifdef _WIN32
#include <time.h>
#include <stdio.h>
#include <conio.h>
#include <windows.h>

static LARGE_INTEGER liFrequency;
static LARGE_INTEGER liStartTime;
static LARGE_INTEGER liCurrentTime;

static void tstart ( void )
{
    QueryPerformanceFrequency ( &liFrequency );
    QueryPerformanceCounter ( &liStartTime );
}
static void tend ( void )
{
    QueryPerformanceCounter ( &liCurrentTime );
}
static double tval( void )
{
    return ((double)( (liCurrentTime.QuadPart - liStartTime.QuadPart)* (double)1000.0/(double)liFrequency.QuadPart ));
}
#else
#include <sys/time.h>
static struct timeval _tstart, _tend;
static struct timezone tz;
static void tstart ( void )
{
    gettimeofday ( &_tstart, &tz );
}
static void tend ( void )
{
    gettimeofday ( &_tend,&tz );
}
  #if 0
static double tval()
{
    double t1, t2;
    t1 = ( double ) _tstart.tv_sec*1000 + ( double ) _tstart.tv_usec/ ( 1000 );
    t2 = ( double ) _tend.tv_sec*1000 + ( double ) _tend.tv_usec/ ( 1000 );
    return t2-t1;
}
  #endif
#endif

struct GPUTexture;

static int intersect_edges(float *points, float a, float b, float c, float d, float edges[12][2][3])
{
    int i;
    float t;
    int numpoints = 0;
    
    for (i=0; i<12; i++) {
        t = -(a*edges[i][0][0] + b*edges[i][0][1] + c*edges[i][0][2] + d)
            / (a*edges[i][1][0] + b*edges[i][1][1] + c*edges[i][1][2]);
        if ((t>0)&&(t<1)) {
            points[numpoints * 3 + 0] = edges[i][0][0] + edges[i][1][0]*t;
            points[numpoints * 3 + 1] = edges[i][0][1] + edges[i][1][1]*t;
            points[numpoints * 3 + 2] = edges[i][0][2] + edges[i][1][2]*t;
            numpoints++;
        }
    }
    return numpoints;
}

static int convex(float *p0, float *up, float *a, float *b)
{
    // Vec3 va = a-p0, vb = b-p0;
    float va[3], vb[3], tmp[3];
    sub_v3_v3v3(va, a, p0);
    sub_v3_v3v3(vb, b, p0);
    cross_v3_v3v3(tmp, va, vb);
    return dot_v3v3(up, tmp) >= 0;
}

void draw_volume(ARegion *ar, GPUTexture *tex, float *min, float *max, int res[3], float dx, GPUTexture *tex_shadow)
{
    RegionView3D *rv3d= ar->regiondata;

    float viewnormal[3];
    int i, j, n, good_index;
    float d /*, d0 */ /* UNUSED */, dd, ds;
    float *points = NULL;
    int numpoints = 0;
    float cor[3] = {1.,1.,1.};
    int gl_depth = 0, gl_blend = 0;

    /* draw slices of smoke is adapted from c++ code authored by: Johannes Schmid and Ingemar Rask, 2006, johnny@grob.org */
    float cv[][3] = {
        {1.0f, 1.0f, 1.0f}, {-1.0f, 1.0f, 1.0f}, {-1.0f, -1.0f, 1.0f}, {1.0f, -1.0f, 1.0f},
        {1.0f, 1.0f, -1.0f}, {-1.0f, 1.0f, -1.0f}, {-1.0f, -1.0f, -1.0f}, {1.0f, -1.0f, -1.0f}
    };

    // edges have the form edges[n][0][xyz] + t*edges[n][1][xyz]
    float edges[12][2][3] = {
        {{1.0f, 1.0f, -1.0f}, {0.0f, 0.0f, 2.0f}},
        {{-1.0f, 1.0f, -1.0f}, {0.0f, 0.0f, 2.0f}},
        {{-1.0f, -1.0f, -1.0f}, {0.0f, 0.0f, 2.0f}},
        {{1.0f, -1.0f, -1.0f}, {0.0f, 0.0f, 2.0f}},

        {{1.0f, -1.0f, 1.0f}, {0.0f, 2.0f, 0.0f}},
        {{-1.0f, -1.0f, 1.0f}, {0.0f, 2.0f, 0.0f}},
        {{-1.0f, -1.0f, -1.0f}, {0.0f, 2.0f, 0.0f}},
        {{1.0f, -1.0f, -1.0f}, {0.0f, 2.0f, 0.0f}},

        {{-1.0f, 1.0f, 1.0f}, {2.0f, 0.0f, 0.0f}},
        {{-1.0f, -1.0f, 1.0f}, {2.0f, 0.0f, 0.0f}},
        {{-1.0f, -1.0f, -1.0f}, {2.0f, 0.0f, 0.0f}},
        {{-1.0f, 1.0f, -1.0f}, {2.0f, 0.0f, 0.0f}}
    };

    /* Fragment program to calculate the view3d of smoke */
    /* using 2 textures, density and shadow */
    const char *text = "!!ARBfp1.0\n"
                    "PARAM dx = program.local[0];\n"
                    "PARAM darkness = program.local[1];\n"
                    "PARAM f = {1.442695041, 1.442695041, 1.442695041, 0.01};\n"
                    "TEMP temp, shadow, value;\n"
                    "TEX temp, fragment.texcoord[0], texture[0], 3D;\n"
                    "TEX shadow, fragment.texcoord[0], texture[1], 3D;\n"
                    "MUL value, temp, darkness;\n"
                    "MUL value, value, dx;\n"
                    "MUL value, value, f;\n"
                    "EX2 temp, -value.r;\n"
                    "SUB temp.a, 1.0, temp.r;\n"
                    "MUL temp.r, temp.r, shadow.r;\n"
                    "MUL temp.g, temp.g, shadow.r;\n"
                    "MUL temp.b, temp.b, shadow.r;\n"
                    "MOV result.color, temp;\n"
                    "END\n";
    GLuint prog;

    
    float size[3];

    if(!tex) {
        printf("Could not allocate 3D texture for 3D View smoke drawing.\n");
        return;
    }

    tstart();

    sub_v3_v3v3(size, max, min);

    // maxx, maxy, maxz
    cv[0][0] = max[0];
    cv[0][1] = max[1];
    cv[0][2] = max[2];
    // minx, maxy, maxz
    cv[1][0] = min[0];
    cv[1][1] = max[1];
    cv[1][2] = max[2];
    // minx, miny, maxz
    cv[2][0] = min[0];
    cv[2][1] = min[1];
    cv[2][2] = max[2];
    // maxx, miny, maxz
    cv[3][0] = max[0];
    cv[3][1] = min[1];
    cv[3][2] = max[2];

    // maxx, maxy, minz
    cv[4][0] = max[0];
    cv[4][1] = max[1];
    cv[4][2] = min[2];
    // minx, maxy, minz
    cv[5][0] = min[0];
    cv[5][1] = max[1];
    cv[5][2] = min[2];
    // minx, miny, minz
    cv[6][0] = min[0];
    cv[6][1] = min[1];
    cv[6][2] = min[2];
    // maxx, miny, minz
    cv[7][0] = max[0];
    cv[7][1] = min[1];
    cv[7][2] = min[2];

    copy_v3_v3(edges[0][0], cv[4]); // maxx, maxy, minz
    copy_v3_v3(edges[1][0], cv[5]); // minx, maxy, minz
    copy_v3_v3(edges[2][0], cv[6]); // minx, miny, minz
    copy_v3_v3(edges[3][0], cv[7]); // maxx, miny, minz

    copy_v3_v3(edges[4][0], cv[3]); // maxx, miny, maxz
    copy_v3_v3(edges[5][0], cv[2]); // minx, miny, maxz
    copy_v3_v3(edges[6][0], cv[6]); // minx, miny, minz
    copy_v3_v3(edges[7][0], cv[7]); // maxx, miny, minz

    copy_v3_v3(edges[8][0], cv[1]); // minx, maxy, maxz
    copy_v3_v3(edges[9][0], cv[2]); // minx, miny, maxz
    copy_v3_v3(edges[10][0], cv[6]); // minx, miny, minz
    copy_v3_v3(edges[11][0], cv[5]); // minx, maxy, minz

    // printf("size x: %f, y: %f, z: %f\n", size[0], size[1], size[2]);
    // printf("min[2]: %f, max[2]: %f\n", min[2], max[2]);

    edges[0][1][2] = size[2];
    edges[1][1][2] = size[2];
    edges[2][1][2] = size[2];
    edges[3][1][2] = size[2];

    edges[4][1][1] = size[1];
    edges[5][1][1] = size[1];
    edges[6][1][1] = size[1];
    edges[7][1][1] = size[1];

    edges[8][1][0] = size[0];
    edges[9][1][0] = size[0];
    edges[10][1][0] = size[0];
    edges[11][1][0] = size[0];

    glGetBooleanv(GL_BLEND, (GLboolean *)&gl_blend);
    glGetBooleanv(GL_DEPTH_TEST, (GLboolean *)&gl_depth);

    glLoadMatrixf(rv3d->viewmat);
    // glMultMatrixf(ob->obmat);    

    glDepthMask(GL_FALSE);
    glDisable(GL_DEPTH_TEST);
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    /*
    printf("Viewinv:\n");
    printf("%f, %f, %f\n", rv3d->viewinv[0][0], rv3d->viewinv[0][1], rv3d->viewinv[0][2]);
    printf("%f, %f, %f\n", rv3d->viewinv[1][0], rv3d->viewinv[1][1], rv3d->viewinv[1][2]);
    printf("%f, %f, %f\n", rv3d->viewinv[2][0], rv3d->viewinv[2][1], rv3d->viewinv[2][2]);
    */

    // get view vector
    copy_v3_v3(viewnormal, rv3d->viewinv[2]);
    normalize_v3(viewnormal);

    // find cube vertex that is closest to the viewer
    for (i=0; i<8; i++) {
        float x,y,z;

        x = cv[i][0] - viewnormal[0];
        y = cv[i][1] - viewnormal[1];
        z = cv[i][2] - viewnormal[2];

        if ((x>=min[0])&&(x<=max[0])
            &&(y>=min[1])&&(y<=max[1])
            &&(z>=min[2])&&(z<=max[2])) {
            break;
        }
    }

    if(i >= 8) {
        /* fallback, avoid using buffer over-run */
        i= 0;
    }

    // printf("i: %d\n", i);
    // printf("point %f, %f, %f\n", cv[i][0], cv[i][1], cv[i][2]);

    if (GL_TRUE == glewIsSupported("GL_ARB_fragment_program"))
    {
        glEnable(GL_FRAGMENT_PROGRAM_ARB);
        glGenProgramsARB(1, &prog);

        glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, prog);
        glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, (GLsizei)strlen(text), text);

        // cell spacing
        glProgramLocalParameter4fARB (GL_FRAGMENT_PROGRAM_ARB, 0, dx, dx, dx, 1.0);
        // custom parameter for smoke style (higher = thicker)
        glProgramLocalParameter4fARB (GL_FRAGMENT_PROGRAM_ARB, 1, 7.0, 7.0, 7.0, 1.0);
    }
    else
        printf("Your gfx card does not support 3D View smoke drawing.\n");

    GPU_texture_bind(tex, 0);
    if(tex_shadow)
        GPU_texture_bind(tex_shadow, 1);
    else
        printf("No volume shadow\n");

    if (!GPU_non_power_of_two_support()) {
        cor[0] = (float)res[0]/(float)power_of_2_max_i(res[0]);
        cor[1] = (float)res[1]/(float)power_of_2_max_i(res[1]);
        cor[2] = (float)res[2]/(float)power_of_2_max_i(res[2]);
    }

    // our slices are defined by the plane equation a*x + b*y +c*z + d = 0
    // (a,b,c), the plane normal, are given by viewdir
    // d is the parameter along the view direction. the first d is given by
    // inserting previously found vertex into the plane equation

    /* d0 = (viewnormal[0]*cv[i][0] + viewnormal[1]*cv[i][1] + viewnormal[2]*cv[i][2]); */ /* UNUSED */
    ds = (ABS(viewnormal[0])*size[0] + ABS(viewnormal[1])*size[1] + ABS(viewnormal[2])*size[2]);
    dd = 0.05; // ds/512.0f;
    n = 0;
    good_index = i;

    // printf("d0: %f, dd: %f, ds: %f\n\n", d0, dd, ds);

    points = MEM_callocN(sizeof(float)*12*3, "smoke_points_preview");

    while(1) {
        float p0[3];
        float tmp_point[3], tmp_point2[3];

        if(dd*(float)n > ds)
            break;

        copy_v3_v3(tmp_point, viewnormal);
        mul_v3_fl(tmp_point, -dd*((ds/dd)-(float)n));
        add_v3_v3v3(tmp_point2, cv[good_index], tmp_point);
        d = dot_v3v3(tmp_point2, viewnormal);

        // printf("my d: %f\n", d);

        // intersect_edges returns the intersection points of all cube edges with
        // the given plane that lie within the cube
        numpoints = intersect_edges(points, viewnormal[0], viewnormal[1], viewnormal[2], -d, edges);

        // printf("points: %d\n", numpoints);

        if (numpoints > 2) {
            copy_v3_v3(p0, points);

            // sort points to get a convex polygon
            for(i = 1; i < numpoints - 1; i++)
            {
                for(j = i + 1; j < numpoints; j++)
                {
                    if(!convex(p0, viewnormal, &points[j * 3], &points[i * 3]))
                    {
                        float tmp2[3];
                        copy_v3_v3(tmp2, &points[j * 3]);
                        copy_v3_v3(&points[j * 3], &points[i * 3]);
                        copy_v3_v3(&points[i * 3], tmp2);
                    }
                }
            }

            // printf("numpoints: %d\n", numpoints);
            glBegin(GL_POLYGON);
            glColor3f(1.0, 1.0, 1.0);
            for (i = 0; i < numpoints; i++) {
                glTexCoord3d((points[i * 3 + 0] - min[0] )*cor[0]/size[0], (points[i * 3 + 1] - min[1])*cor[1]/size[1], (points[i * 3 + 2] - min[2])*cor[2]/size[2]);
                glVertex3f(points[i * 3 + 0], points[i * 3 + 1], points[i * 3 + 2]);
            }
            glEnd();
        }
        n++;
    }

    tend();
    // printf ( "Draw Time: %f\n",( float ) tval() );

    if(tex_shadow)
        GPU_texture_unbind(tex_shadow);
    GPU_texture_unbind(tex);

    if(GLEW_ARB_fragment_program)
    {
        glDisable(GL_FRAGMENT_PROGRAM_ARB);
        glDeleteProgramsARB(1, &prog);
    }


    MEM_freeN(points);

    if(!gl_blend)
        glDisable(GL_BLEND);
    if(gl_depth)
    {
        glEnable(GL_DEPTH_TEST);
        glDepthMask(GL_TRUE);   
    }
}