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#define _POSIX_C_SOURCE 200112L
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "gr3.h"
#include "gr3_internals.h"
#ifndef fabsf
#define fabsf(x) ((x) < 0 ? -(x) : (x))
#endif
int gr3_getpovray_(char *pixels, int width, int height, int use_alpha, int ssaa_factor)
{
int i;
#ifdef GR3_USE_WIN
char *povfile = malloc(40);
char *pngfile = malloc(40);
snprintf(povfile, 40, "./gr3.%lu.pov", (long unsigned)GetCurrentProcessId());
snprintf(pngfile, 40, "./gr3.%lu.png", (long unsigned)GetCurrentProcessId());
#else
char *povfile = malloc(40);
char *pngfile = malloc(40);
snprintf(povfile, 40, "/tmp/gr3.%d.pov", getpid());
snprintf(pngfile, 40, "/tmp/gr3.%d.png", getpid());
#endif
gr3_export_pov_(povfile, width, height);
{
int res;
char *povray_call = malloc(strlen(povfile) + strlen(povfile) + 80);
#ifdef GR3_USE_WIN
snprintf(povray_call, strlen(povfile) + strlen(povfile) + 80,
"megapov +I%s +O%s +W%d +H%d -D +UA +FN +A +R%d 2>NUL", povfile, pngfile, width, height, ssaa_factor);
#else
snprintf(povray_call, strlen(povfile) + strlen(povfile) + 80,
"povray +I%s +O%s +W%d +H%d -D +UA +FN +A +R%d 2>/dev/null", povfile, pngfile, width, height, ssaa_factor);
#endif
res = system(povray_call);
free(povray_call);
if (use_alpha)
{
res = gr3_readpngtomemory_((int *)pixels, pngfile, width, height);
if (res)
{
RETURN_ERROR(GR3_ERROR_EXPORT);
}
}
else
{
char *raw_pixels = malloc(width * height * 4);
if (!raw_pixels)
{
RETURN_ERROR(GR3_ERROR_OUT_OF_MEM);
}
res = gr3_readpngtomemory_((int *)raw_pixels, pngfile, width, height);
if (res)
{
free(raw_pixels);
RETURN_ERROR(GR3_ERROR_EXPORT);
}
for (i = 0; i < width * height; i++)
{
pixels[3 * i + 0] = raw_pixels[4 * i + 0];
pixels[3 * i + 1] = raw_pixels[4 * i + 1];
pixels[3 * i + 2] = raw_pixels[4 * i + 2];
}
free(raw_pixels);
}
}
remove(povfile);
remove(pngfile);
free(povfile);
free(pngfile);
return GR3_ERROR_NONE;
}
static void gr3_write_clipped_by(FILE *povfp)
{
if (isfinite(context_struct_.clip_xmin) || isfinite(context_struct_.clip_xmax) ||
isfinite(context_struct_.clip_ymin) || isfinite(context_struct_.clip_ymax) ||
isfinite(context_struct_.clip_zmin) || isfinite(context_struct_.clip_zmax))
{
fprintf(povfp, "clipped_by { intersection {\n");
if (isfinite(context_struct_.clip_xmin))
{
fprintf(povfp, "plane { x, %f inverse }\n", context_struct_.clip_xmin);
}
if (isfinite(context_struct_.clip_xmax))
{
fprintf(povfp, "plane { x, %f }\n", context_struct_.clip_xmax);
}
if (isfinite(context_struct_.clip_ymin))
{
fprintf(povfp, "plane { y, %f inverse }\n", context_struct_.clip_ymin);
}
if (isfinite(context_struct_.clip_ymax))
{
fprintf(povfp, "plane { y, %f }\n", context_struct_.clip_ymax);
}
if (isfinite(context_struct_.clip_zmin))
{
fprintf(povfp, "plane { z, %f inverse }\n", context_struct_.clip_zmin);
}
if (isfinite(context_struct_.clip_zmax))
{
fprintf(povfp, "plane { z, %f }\n", context_struct_.clip_zmax);
}
fprintf(povfp, "} }\n");
}
}
static void print_pigment_and_finish(GR3_DrawList_t_ *draw, char *alpha_text, float alpha_val, int i, FILE *povfp,
float red, float green, float blue)
{
if (draw->alpha_mode == 0)
{
fprintf(povfp,
"pigment { color rgb <%f, %f, %f> } finish { ambient %f diffuse %f "
"specular %f roughness %f } \n",
draw->colors[i * 3 + 0] * red, draw->colors[i * 3 + 1] * green, draw->colors[i * 3 + 2] * blue,
context_struct_.light_parameters.ambient, context_struct_.light_parameters.diffuse,
context_struct_.light_parameters.specular, 1 / (context_struct_.light_parameters.specular_exponent + 1));
}
else
{
fprintf(povfp,
"pigment { color rgb <%f, %f, %f> %s %f} finish { ambient %f diffuse %f specular "
"%f roughness %f} \n",
draw->colors[i * 3 + 0] * red, draw->colors[i * 3 + 1] * green, draw->colors[i * 3 + 2] * blue,
alpha_text, alpha_val, context_struct_.light_parameters.ambient * (1 - alpha_val),
context_struct_.light_parameters.diffuse * (1 - alpha_val),
context_struct_.light_parameters.specular * (1 - alpha_val),
(1 - alpha_val) / (context_struct_.light_parameters.specular_exponent + 1));
}
}
int gr3_export_pov_(const char *filename, int width, int height)
{
int i, j, k, l;
FILE *povfp;
GR3_DrawList_t_ *draw;
povfp = fopen(filename, "w");
if (!povfp)
{
RETURN_ERROR(GR3_ERROR_CANNOT_OPEN_FILE);
}
fprintf(povfp, "camera {\n");
if (context_struct_.projection_type == GR3_PROJECTION_ORTHOGRAPHIC)
{
fprintf(povfp, " orthographic\n");
}
fprintf(povfp, " location <%f, %f, %f>\n", context_struct_.camera_x, context_struct_.camera_y,
context_struct_.camera_z);
fprintf(povfp, " look_at <%f, %f, %f>\n", context_struct_.center_x, context_struct_.center_y,
context_struct_.center_z);
fprintf(povfp, " sky <%f, %f, %f>\n", context_struct_.up_x, context_struct_.up_y, context_struct_.up_z);
if (context_struct_.projection_type != GR3_PROJECTION_ORTHOGRAPHIC)
{
fprintf(povfp, " up <0,1,0>\n");
fprintf(povfp, " right <-%f,0,0>\n", 1.0 * width / height);
fprintf(povfp, " angle %f\n", context_struct_.vertical_field_of_view * 1.0 * width / height);
}
else
{
fprintf(povfp, " up <0 %f 0>\n", fabsf(context_struct_.top) + fabsf(context_struct_.bottom));
fprintf(povfp, " right <-%f,0,0>\n", fabsf(context_struct_.right) + fabsf(context_struct_.left));
}
fprintf(povfp, "}\n");
if (context_struct_.num_lights == 0)
{
GLfloat camera_pos[3];
camera_pos[0] = context_struct_.camera_x;
camera_pos[1] = context_struct_.camera_y;
camera_pos[2] = context_struct_.camera_z;
fprintf(povfp, "light_source { <%f, %f, %f> color rgb <1.0, 1.0, 1.0> parallel point_at <0,0,0>}\n",
camera_pos[0], camera_pos[1], camera_pos[2]);
}
else
{
for (i = 0; i < context_struct_.num_lights; i++)
{
if (context_struct_.light_sources[i].x == 0 && context_struct_.light_sources[i].y == 0 &&
context_struct_.light_sources[i].z == 0)
{
GLfloat camera_pos[3];
camera_pos[0] = context_struct_.camera_x;
camera_pos[1] = context_struct_.camera_y;
camera_pos[2] = context_struct_.camera_z;
fprintf(povfp, "light_source { <%f, %f, %f> color rgb <%f, %f, %f> parallel point_at <0,0,0>}\n",
camera_pos[0], camera_pos[1], camera_pos[2], context_struct_.light_sources[i].r,
context_struct_.light_sources[i].g, context_struct_.light_sources[i].b);
}
else
{
fprintf(povfp, "light_source { <%f, %f, %f> color rgb <%f, %f, %f> parallel point_at <0,0,0>}\n",
context_struct_.light_sources[i].x, context_struct_.light_sources[i].y,
context_struct_.light_sources[i].z, context_struct_.light_sources[i].r,
context_struct_.light_sources[i].g, context_struct_.light_sources[i].b);
}
}
}
fprintf(povfp, "background { color rgb <%f, %f, %f> }\n", context_struct_.background_color[0],
context_struct_.background_color[1], context_struct_.background_color[2]);
draw = context_struct_.draw_list_;
while (draw)
{
float alpha_val;
char *alpha_text;
if (draw->alpha_mode == 0)
{
alpha_text = "";
}
else if (draw->alpha_mode == 1)
{
alpha_text = "transmit";
alpha_val = 1 - draw->alphas[0];
}
else
{
alpha_text = "filter";
alpha_val = 1 - (draw->alphas[0] + draw->alphas[1] + draw->alphas[2]) / 3;
}
gr3_sortindexedmeshdata(draw->mesh);
switch (context_struct_.mesh_list_[draw->mesh].data.type)
{
case kMTSphereMesh:
for (i = 0; i < draw->n; i++)
{
fprintf(povfp, "sphere {\n");
fprintf(povfp, " <%f, %f, %f>, %f\n", draw->positions[i * 3 + 0], draw->positions[i * 3 + 1],
draw->positions[i * 3 + 2], draw->scales[i * 3 + 0]);
fprintf(povfp, " texture {\n");
print_pigment_and_finish(draw, alpha_text, alpha_val, i, povfp, 1, 1, 1);
fprintf(povfp, " }\n");
gr3_write_clipped_by(povfp);
fprintf(povfp, " no_shadow \n");
fprintf(povfp, "}\n");
}
break;
case kMTCylinderMesh:
for (i = 0; i < draw->n; i++)
{
float len_sq = draw->directions[i * 3 + 0] * draw->directions[i * 3 + 0] +
draw->directions[i * 3 + 1] * draw->directions[i * 3 + 1] +
draw->directions[i * 3 + 2] * draw->directions[i * 3 + 2];
float len = sqrt(len_sq);
fprintf(povfp, "cylinder {\n");
fprintf(povfp, " <%f, %f, %f>, <%f, %f, %f>, %f\n", draw->positions[i * 3 + 0],
draw->positions[i * 3 + 1], draw->positions[i * 3 + 2],
draw->positions[i * 3 + 0] + draw->directions[i * 3 + 0] / len * draw->scales[i * 3 + 2],
draw->positions[i * 3 + 1] + draw->directions[i * 3 + 1] / len * draw->scales[i * 3 + 2],
draw->positions[i * 3 + 2] + draw->directions[i * 3 + 2] / len * draw->scales[i * 3 + 2],
draw->scales[i * 3 + 0]);
fprintf(povfp, " texture {\n");
print_pigment_and_finish(draw, alpha_text, alpha_val, i, povfp, 1, 1, 1);
fprintf(povfp, " }\n");
gr3_write_clipped_by(povfp);
fprintf(povfp, " no_shadow \n");
fprintf(povfp, "}\n");
}
break;
case kMTConeMesh:
for (i = 0; i < draw->n; i++)
{
float len_sq = draw->directions[i * 3 + 0] * draw->directions[i * 3 + 0] +
draw->directions[i * 3 + 1] * draw->directions[i * 3 + 1] +
draw->directions[i * 3 + 2] * draw->directions[i * 3 + 2];
float len = sqrt(len_sq);
fprintf(povfp, "cone {\n");
fprintf(povfp, " <%f, %f, %f>, %f, <%f, %f, %f>, %f\n", draw->positions[i * 3 + 0],
draw->positions[i * 3 + 1], draw->positions[i * 3 + 2], draw->scales[i * 3 + 0],
draw->positions[i * 3 + 0] + draw->directions[i * 3 + 0] / len * draw->scales[i * 3 + 2],
draw->positions[i * 3 + 1] + draw->directions[i * 3 + 1] / len * draw->scales[i * 3 + 2],
draw->positions[i * 3 + 2] + draw->directions[i * 3 + 2] / len * draw->scales[i * 3 + 2], 0.0);
fprintf(povfp, " texture {\n");
print_pigment_and_finish(draw, alpha_text, alpha_val, i, povfp, 1, 1, 1);
fprintf(povfp, " }\n");
gr3_write_clipped_by(povfp);
fprintf(povfp, " no_shadow \n");
fprintf(povfp, "}\n");
}
break;
case kMTIndexedMesh:
case kMTNormalMesh:
for (i = 0; i < draw->n; i++)
{
GLfloat model_matrix[4][4] = {{0}};
const float *vertices = context_struct_.mesh_list_[draw->mesh].data.vertices;
const float *normals = context_struct_.mesh_list_[draw->mesh].data.normals;
const float *colors = context_struct_.mesh_list_[draw->mesh].data.colors;
{
int m;
GLfloat forward[3], up[3], left[3];
float tmp;
/* Calculate an orthonormal base in IR^3, correcting the up vector
* in case it is not perpendicular to the forward vector. This base
* is used to create the model matrix as a base-transformation
* matrix.
*/
/* forward = normalize(&directions[i*3]); */
tmp = 0;
for (m = 0; m < 3; m++)
{
tmp += draw->directions[i * 3 + m] * draw->directions[i * 3 + m];
}
tmp = sqrt(tmp);
for (m = 0; m < 3; m++)
{
forward[m] = draw->directions[i * 3 + m] / tmp;
} /* up = normalize(&ups[i*3]); */
tmp = 0;
for (m = 0; m < 3; m++)
{
tmp += draw->ups[i * 3 + m] * draw->ups[i * 3 + m];
}
tmp = sqrt(tmp);
for (m = 0; m < 3; m++)
{
up[m] = draw->ups[i * 3 + m] / tmp;
}
/* left = cross(forward,up); */
for (m = 0; m < 3; m++)
{
left[m] = forward[(m + 1) % 3] * up[(m + 2) % 3] - up[(m + 1) % 3] * forward[(m + 2) % 3];
}
/* up = cross(left,forward); */
for (m = 0; m < 3; m++)
{
up[m] = left[(m + 1) % 3] * forward[(m + 2) % 3] - forward[(m + 1) % 3] * left[(m + 2) % 3];
}
for (m = 0; m < 3; m++)
{
model_matrix[0][m] = -left[m];
model_matrix[1][m] = up[m];
model_matrix[2][m] = forward[m];
model_matrix[3][m] = draw->positions[i * 3 + m];
}
model_matrix[3][3] = 1;
}
fprintf(povfp, "mesh {\n");
for (j = 0; j < context_struct_.mesh_list_[draw->mesh].data.number_of_vertices / 3; j++)
{
float red = (colors[j * 9 + 0] + colors[j * 9 + 3] + colors[j * 9 + 6]) / 3.0;
float green = (colors[j * 9 + 1] + colors[j * 9 + 4] + colors[j * 9 + 7]) / 3.0;
float blue = (colors[j * 9 + 2] + colors[j * 9 + 5] + colors[j * 9 + 8]) / 3.0;
fprintf(povfp, "#local tex = texture { ");
print_pigment_and_finish(draw, alpha_text, alpha_val, i, povfp, red, green, blue);
fprintf(povfp, "}\n");
fprintf(povfp, " smooth_triangle {\n");
for (k = 0; k < 3; k++)
{
float vertex1[4];
float vertex2[4];
float normal1[3];
float normal2[3];
for (l = 0; l < 3; l++)
{
vertex1[l] = draw->scales[i * 3 + l] * vertices[j * 9 + k * 3 + l];
}
vertex1[3] = 1;
for (l = 0; l < 4; l++)
{
vertex2[l] = model_matrix[0][l] * vertex1[0] + model_matrix[1][l] * vertex1[1] +
model_matrix[2][l] * vertex1[2] + model_matrix[3][l] * vertex1[3];
}
for (l = 0; l < 3; l++)
{
normal1[l] = normals[j * 9 + k * 3 + l];
}
vertex1[3] = 1;
for (l = 0; l < 3; l++)
{
normal2[l] = model_matrix[0][l] * normal1[0] + model_matrix[1][l] * normal1[1] +
model_matrix[2][l] * normal1[2];
}
fprintf(povfp, " <%f, %f, %f>,", vertex2[0], vertex2[1], vertex2[2]);
fprintf(povfp, " <%f, %f, %f>", normal2[0], normal2[1], normal2[2]);
if (k < 2)
{
fprintf(povfp, ",");
}
fprintf(povfp, "\n");
}
fprintf(povfp, " texture { tex }\n");
fprintf(povfp, " }\n");
}
gr3_write_clipped_by(povfp);
fprintf(povfp, " no_shadow \n");
fprintf(povfp, "}\n");
}
break;
default:
gr3_log_("Unknown mesh type");
break;
}
draw = draw->next;
}
fclose(povfp);
return 0;
}
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