void draw_smoke_volume(SmokeDomainSettings *sds, Object *ob,
const float min[3], const float max[3],
const float viewnormal[3])
{
if (!sds->tex || !sds->tex_shadow) {
fprintf(stderr, "Could not allocate 3D texture for volume rendering!\n");
return;
}
const bool use_fire = (sds->active_fields & SM_ACTIVE_FIRE) && sds->tex_flame;
GPUShader *shader = GPU_shader_get_builtin_shader(
(use_fire) ? GPU_SHADER_SMOKE_FIRE : GPU_SHADER_SMOKE);
if (!shader) {
fprintf(stderr, "Unable to create GLSL smoke shader.\n");
return;
}
const float ob_sizei[3] = {
1.0f / fabsf(ob->size[0]),
1.0f / fabsf(ob->size[1]),
1.0f / fabsf(ob->size[2])
};
const float size[3] = { max[0] - min[0], max[1] - min[1], max[2] - min[2] };
const float invsize[3] = { 1.0f / size[0], 1.0f / size[1], 1.0f / size[2] };
#ifdef DEBUG_DRAW_TIME
TIMEIT_START(draw);
#endif
/* setup smoke shader */
int soot_location = GPU_shader_get_uniform(shader, "soot_texture");
int spec_location = GPU_shader_get_uniform(shader, "spectrum_texture");
int shadow_location = GPU_shader_get_uniform(shader, "shadow_texture");
int flame_location = GPU_shader_get_uniform(shader, "flame_texture");
int actcol_location = GPU_shader_get_uniform(shader, "active_color");
int stepsize_location = GPU_shader_get_uniform(shader, "step_size");
int densityscale_location = GPU_shader_get_uniform(shader, "density_scale");
int invsize_location = GPU_shader_get_uniform(shader, "invsize");
int ob_sizei_location = GPU_shader_get_uniform(shader, "ob_sizei");
int min_location = GPU_shader_get_uniform(shader, "min");
GPU_shader_bind(shader);
GPU_texture_bind(sds->tex, 0);
GPU_shader_uniform_texture(shader, soot_location, sds->tex);
GPU_texture_bind(sds->tex_shadow, 1);
GPU_shader_uniform_texture(shader, shadow_location, sds->tex_shadow);
GPUTexture *tex_spec = NULL;
if (use_fire) {
GPU_texture_bind(sds->tex_flame, 2);
GPU_shader_uniform_texture(shader, flame_location, sds->tex_flame);
tex_spec = create_flame_spectrum_texture();
GPU_texture_bind(tex_spec, 3);
GPU_shader_uniform_texture(shader, spec_location, tex_spec);
}
float active_color[3] = { 0.9, 0.9, 0.9 };
float density_scale = 10.0f;
if ((sds->active_fields & SM_ACTIVE_COLORS) == 0)
mul_v3_v3(active_color, sds->active_color);
GPU_shader_uniform_vector(shader, actcol_location, 3, 1, active_color);
GPU_shader_uniform_vector(shader, stepsize_location, 1, 1, &sds->dx);
GPU_shader_uniform_vector(shader, densityscale_location, 1, 1, &density_scale);
GPU_shader_uniform_vector(shader, min_location, 3, 1, min);
GPU_shader_uniform_vector(shader, ob_sizei_location, 3, 1, ob_sizei);
GPU_shader_uniform_vector(shader, invsize_location, 3, 1, invsize);
/* setup slicing information */
const int max_slices = 256;
const int max_points = max_slices * 12;
VolumeSlicer slicer;
copy_v3_v3(slicer.min, min);
copy_v3_v3(slicer.max, max);
copy_v3_v3(slicer.size, size);
slicer.verts = MEM_mallocN(sizeof(float) * 3 * max_points, "smoke_slice_vertices");
const int num_points = create_view_aligned_slices(&slicer, max_slices, viewnormal);
/* setup buffer and draw */
int gl_depth = 0, gl_blend = 0;
glGetBooleanv(GL_BLEND, (GLboolean *)&gl_blend);
glGetBooleanv(GL_DEPTH_TEST, (GLboolean *)&gl_depth);
glEnable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
GLuint vertex_buffer;
glGenBuffers(1, &vertex_buffer);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 3 * num_points, &slicer.verts[0][0], GL_STATIC_DRAW);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, NULL);
glDrawArrays(GL_TRIANGLES, 0, num_points);
glDisableClientState(GL_VERTEX_ARRAY);
#ifdef DEBUG_DRAW_TIME
printf("Draw Time: %f\n", (float)TIMEIT_VALUE(draw));
TIMEIT_END(draw);
#endif
/* cleanup */
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDeleteBuffers(1, &vertex_buffer);
GPU_texture_unbind(sds->tex);
GPU_texture_unbind(sds->tex_shadow);
if (use_fire) {
GPU_texture_unbind(sds->tex_flame);
GPU_texture_unbind(tex_spec);
GPU_texture_free(tex_spec);
}
MEM_freeN(slicer.verts);
GPU_shader_unbind();
if (!gl_blend) {
glDisable(GL_BLEND);
}
if (gl_depth) {
glEnable(GL_DEPTH_TEST);
}
}
void draw_smoke_volume(SmokeDomainSettings *sds, Object *ob,
GPUTexture *tex, float min[3], float max[3],
int res[3], float dx, float UNUSED(base_scale), float viewnormal[3],
GPUTexture *tex_shadow, GPUTexture *tex_flame)
{
int i, j, k, n, good_index;
float d /*, d0 */ /* UNUSED */, dd, ds;
float *points = NULL;
int numpoints = 0;
float cor[3] = {1.0f, 1.0f, 1.0f};
int gl_depth = 0, gl_blend = 0;
/* draw slices of smoke is adapted from c++ code authored
* by: Johannes Schmid and Ingemar Rask, 2006, [email protected] */
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}}
};
unsigned char *spec_data;
float *spec_pixels;
GPUTexture *tex_spec;
/* Fragment program to calculate the view3d of smoke */
/* using 4 textures, density, shadow, flame and flame spectrum */
const char *shader_basic =
"!!ARBfp1.0\n"
"PARAM dx = program.local[0];\n"
"PARAM darkness = program.local[1];\n"
"PARAM render = program.local[2];\n"
"PARAM f = {1.442695041, 1.442695041, 1.442695041, 0.01};\n"
"TEMP temp, shadow, flame, spec, value;\n"
"TEX temp, fragment.texcoord[0], texture[0], 3D;\n"
"TEX shadow, fragment.texcoord[0], texture[1], 3D;\n"
"TEX flame, fragment.texcoord[0], texture[2], 3D;\n"
"TEX spec, flame.r, texture[3], 1D;\n"
/* calculate shading factor from density */
"MUL value.r, temp.a, darkness.a;\n"
"MUL value.r, value.r, dx.r;\n"
"MUL value.r, value.r, f.r;\n"
"EX2 temp, -value.r;\n"
/* alpha */
"SUB temp.a, 1.0, temp.r;\n"
/* shade colors */
"MUL temp.r, temp.r, shadow.r;\n"
"MUL temp.g, temp.g, shadow.r;\n"
"MUL temp.b, temp.b, shadow.r;\n"
"MUL temp.r, temp.r, darkness.r;\n"
"MUL temp.g, temp.g, darkness.g;\n"
"MUL temp.b, temp.b, darkness.b;\n"
/* for now this just replace smoke shading if rendering fire */
"CMP result.color, render.r, temp, spec;\n"
"END\n";
/* color shader */
const char *shader_color =
"!!ARBfp1.0\n"
"PARAM dx = program.local[0];\n"
"PARAM darkness = program.local[1];\n"
"PARAM render = program.local[2];\n"
"PARAM f = {1.442695041, 1.442695041, 1.442695041, 1.442695041};\n"
"TEMP temp, shadow, flame, spec, value;\n"
"TEX temp, fragment.texcoord[0], texture[0], 3D;\n"
"TEX shadow, fragment.texcoord[0], texture[1], 3D;\n"
"TEX flame, fragment.texcoord[0], texture[2], 3D;\n"
"TEX spec, flame.r, texture[3], 1D;\n"
/* unpremultiply volume texture */
"RCP value.r, temp.a;\n"
"MUL temp.r, temp.r, value.r;\n"
"MUL temp.g, temp.g, value.r;\n"
"MUL temp.b, temp.b, value.r;\n"
/* calculate shading factor from density */
"MUL value.r, temp.a, darkness.a;\n"
"MUL value.r, value.r, dx.r;\n"
"MUL value.r, value.r, f.r;\n"
"EX2 value.r, -value.r;\n"
/* alpha */
"SUB temp.a, 1.0, value.r;\n"
/* shade colors */
"MUL temp.r, temp.r, shadow.r;\n"
"MUL temp.g, temp.g, shadow.r;\n"
"MUL temp.b, temp.b, shadow.r;\n"
"MUL temp.r, temp.r, value.r;\n"
"MUL temp.g, temp.g, value.r;\n"
"MUL temp.b, temp.b, value.r;\n"
/* for now this just replace smoke shading if rendering fire */
"CMP result.color, render.r, temp, spec;\n"
"END\n";
GLuint prog;
float size[3];
if (!tex) {
printf("Could not allocate 3D texture for 3D View smoke drawing.\n");
return;
}
#ifdef DEBUG_DRAW_TIME
TIMEIT_START(draw);
#endif
/* generate flame spectrum texture */
#define SPEC_WIDTH 256
#define FIRE_THRESH 7
#define MAX_FIRE_ALPHA 0.06f
#define FULL_ON_FIRE 100
spec_data = malloc(SPEC_WIDTH * 4 * sizeof(unsigned char));
flame_get_spectrum(spec_data, SPEC_WIDTH, 1500, 3000);
spec_pixels = malloc(SPEC_WIDTH * 4 * 16 * 16 * sizeof(float));
for (i = 0; i < 16; i++) {
for (j = 0; j < 16; j++) {
for (k = 0; k < SPEC_WIDTH; k++) {
int index = (j * SPEC_WIDTH * 16 + i * SPEC_WIDTH + k) * 4;
if (k >= FIRE_THRESH) {
spec_pixels[index] = ((float)spec_data[k * 4]) / 255.0f;
spec_pixels[index + 1] = ((float)spec_data[k * 4 + 1]) / 255.0f;
spec_pixels[index + 2] = ((float)spec_data[k * 4 + 2]) / 255.0f;
spec_pixels[index + 3] = MAX_FIRE_ALPHA * (
(k > FULL_ON_FIRE) ? 1.0f : (k - FIRE_THRESH) / ((float)FULL_ON_FIRE - FIRE_THRESH));
}
else {
spec_pixels[index] = spec_pixels[index + 1] = spec_pixels[index + 2] = spec_pixels[index + 3] = 0.0f;
}
}
}
}
tex_spec = GPU_texture_create_1D(SPEC_WIDTH, spec_pixels, NULL);
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);
glDepthMask(GL_FALSE);
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
/* 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] * size[0] * 0.5f;
y = cv[i][1] - viewnormal[1] * size[1] * 0.5f;
z = cv[i][2] - viewnormal[2] * size[2] * 0.5f;
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);
/* set shader */
if (sds->active_fields & SM_ACTIVE_COLORS)
glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, (GLsizei)strlen(shader_color), shader_color);
else
glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, (GLsizei)strlen(shader_basic), shader_basic);
/* cell spacing */
glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 0, dx, dx, dx, 1.0);
/* custom parameter for smoke style (higher = thicker) */
if (sds->active_fields & SM_ACTIVE_COLORS)
glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 1, 1.0, 1.0, 1.0, 10.0);
else
glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 1, sds->active_color[0], sds->active_color[1], sds->active_color[2], 10.0);
}
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 (tex_flame) {
GPU_texture_bind(tex_flame, 2);
GPU_texture_bind(tex_spec, 3);
}
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 = (fabsf(viewnormal[0]) * size[0] + fabsf(viewnormal[1]) * size[1] + fabsf(viewnormal[2]) * size[2]);
dd = max_fff(sds->global_size[0], sds->global_size[1], sds->global_size[2]) / 128.f;
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);
}
}
}
/* render fire slice */
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 2, 1.0, 0.0, 0.0, 0.0);
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] / fabsf(ob->size[0]),
points[i * 3 + 1] / fabsf(ob->size[1]),
points[i * 3 + 2] / fabsf(ob->size[2]));
}
glEnd();
/* render smoke slice */
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 2, -1.0, 0.0, 0.0, 0.0);
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] / fabsf(ob->size[0]),
points[i * 3 + 1] / fabsf(ob->size[1]),
points[i * 3 + 2] / fabsf(ob->size[2]));
}
glEnd();
}
n++;
}
#ifdef DEBUG_DRAW_TIME
printf("Draw Time: %f\n", (float)TIMEIT_VALUE(draw));
TIMEIT_END(draw);
#endif
if (tex_shadow)
GPU_texture_unbind(tex_shadow);
GPU_texture_unbind(tex);
if (tex_flame) {
GPU_texture_unbind(tex_flame);
GPU_texture_unbind(tex_spec);
}
GPU_texture_free(tex_spec);
free(spec_data);
free(spec_pixels);
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);
}
}
void draw_smoke_volume(SmokeDomainSettings *sds, Object *ob,
const float min[3], const float max[3],
const float viewnormal[3])
{
if (!sds->tex || !sds->tex_shadow) {
fprintf(stderr, "Could not allocate 3D texture for volume rendering!\n");
return;
}
const bool use_fire = (sds->active_fields & SM_ACTIVE_FIRE) && sds->tex_flame;
GPUShader *shader = GPU_shader_get_builtin_shader(GPU_SHADER_SMOKE);
if (!shader) {
fprintf(stderr, "Unable to create GLSL smoke shader.\n");
return;
}
GPUShader *fire_shader = NULL;
if (use_fire) {
fire_shader = GPU_shader_get_builtin_shader(GPU_SHADER_SMOKE_FIRE);
if (!fire_shader) {
fprintf(stderr, "Unable to create GLSL fire shader.\n");
return;
}
}
const float ob_sizei[3] = {
1.0f / fabsf(ob->size[0]),
1.0f / fabsf(ob->size[1]),
1.0f / fabsf(ob->size[2])
};
const float size[3] = { max[0] - min[0], max[1] - min[1], max[2] - min[2] };
const float invsize[3] = { 1.0f / size[0], 1.0f / size[1], 1.0f / size[2] };
#ifdef DEBUG_DRAW_TIME
TIMEIT_START(draw);
#endif
/* setup slicing information */
const int max_slices = 256;
const int max_points = max_slices * 12;
VolumeSlicer slicer;
copy_v3_v3(slicer.min, min);
copy_v3_v3(slicer.max, max);
copy_v3_v3(slicer.size, size);
slicer.verts = MEM_mallocN(sizeof(float) * 3 * max_points, "smoke_slice_vertices");
const int num_points = create_view_aligned_slices(&slicer, max_slices, viewnormal);
/* setup buffer and draw */
int gl_depth = 0, gl_blend = 0, gl_depth_write = 0;
glGetBooleanv(GL_BLEND, (GLboolean *)&gl_blend);
glGetBooleanv(GL_DEPTH_TEST, (GLboolean *)&gl_depth);
glGetBooleanv(GL_DEPTH_WRITEMASK, (GLboolean *)&gl_depth_write);
glEnable(GL_DEPTH_TEST);
glDepthMask(GL_FALSE);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
draw_buffer(sds, shader, &slicer, ob_sizei, invsize, num_points, false);
/* Draw fire separately (T47639). */
if (use_fire) {
glBlendFunc(GL_ONE, GL_ONE);
draw_buffer(sds, fire_shader, &slicer, ob_sizei, invsize, num_points, true);
}
#ifdef DEBUG_DRAW_TIME
printf("Draw Time: %f\n", (float)TIMEIT_VALUE(draw));
TIMEIT_END(draw);
#endif
MEM_freeN(slicer.verts);
glDepthMask(gl_depth_write);
if (!gl_blend) {
glDisable(GL_BLEND);
}
if (gl_depth) {
glEnable(GL_DEPTH_TEST);
}
}
void draw_smoke_volume(SmokeDomainSettings *sds, Object *ob,
GPUTexture *tex, const float min[3], const float max[3],
const int res[3], float dx, float UNUSED(base_scale), const float viewnormal[3],
GPUTexture *tex_shadow, GPUTexture *tex_flame)
{
const float ob_sizei[3] = {
1.0f / fabsf(ob->size[0]),
1.0f / fabsf(ob->size[1]),
1.0f / fabsf(ob->size[2])};
int i, j, k, n, good_index;
float d /*, d0 */ /* UNUSED */, dd, ds;
float (*points)[3] = NULL;
int numpoints = 0;
float cor[3] = {1.0f, 1.0f, 1.0f};
int gl_depth = 0, gl_blend = 0;
int use_fire = (sds->active_fields & SM_ACTIVE_FIRE);
/* draw slices of smoke is adapted from c++ code authored
* by: Johannes Schmid and Ingemar Rask, 2006, [email protected] */
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}}
};
unsigned char *spec_data;
float *spec_pixels;
GPUTexture *tex_spec;
GPUProgram *smoke_program;
int progtype = (sds->active_fields & SM_ACTIVE_COLORS) ? GPU_PROGRAM_SMOKE_COLORED : GPU_PROGRAM_SMOKE;
float size[3];
if (!tex) {
printf("Could not allocate 3D texture for 3D View smoke drawing.\n");
return;
}
#ifdef DEBUG_DRAW_TIME
TIMEIT_START(draw);
#endif
/* generate flame spectrum texture */
#define SPEC_WIDTH 256
#define FIRE_THRESH 7
#define MAX_FIRE_ALPHA 0.06f
#define FULL_ON_FIRE 100
spec_data = malloc(SPEC_WIDTH * 4 * sizeof(unsigned char));
flame_get_spectrum(spec_data, SPEC_WIDTH, 1500, 3000);
spec_pixels = malloc(SPEC_WIDTH * 4 * 16 * 16 * sizeof(float));
for (i = 0; i < 16; i++) {
for (j = 0; j < 16; j++) {
for (k = 0; k < SPEC_WIDTH; k++) {
int index = (j * SPEC_WIDTH * 16 + i * SPEC_WIDTH + k) * 4;
if (k >= FIRE_THRESH) {
spec_pixels[index] = ((float)spec_data[k * 4]) / 255.0f;
spec_pixels[index + 1] = ((float)spec_data[k * 4 + 1]) / 255.0f;
spec_pixels[index + 2] = ((float)spec_data[k * 4 + 2]) / 255.0f;
spec_pixels[index + 3] = MAX_FIRE_ALPHA * (
(k > FULL_ON_FIRE) ? 1.0f : (k - FIRE_THRESH) / ((float)FULL_ON_FIRE - FIRE_THRESH));
}
else {
spec_pixels[index] = spec_pixels[index + 1] = spec_pixels[index + 2] = spec_pixels[index + 3] = 0.0f;
}
}
}
}
tex_spec = GPU_texture_create_1D(SPEC_WIDTH, spec_pixels, NULL);
#undef SPEC_WIDTH
#undef FIRE_THRESH
#undef MAX_FIRE_ALPHA
#undef FULL_ON_FIRE
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);
glEnable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
/* 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] * size[0] * 0.5f;
y = cv[i][1] - viewnormal[1] * size[1] * 0.5f;
z = cv[i][2] - viewnormal[2] * size[2] * 0.5f;
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]);
smoke_program = GPU_shader_get_builtin_program(progtype);
if (smoke_program) {
GPU_program_bind(smoke_program);
/* cell spacing */
GPU_program_parameter_4f(smoke_program, 0, dx, dx, dx, 1.0);
/* custom parameter for smoke style (higher = thicker) */
if (sds->active_fields & SM_ACTIVE_COLORS)
GPU_program_parameter_4f(smoke_program, 1, 1.0, 1.0, 1.0, 10.0);
else
GPU_program_parameter_4f(smoke_program, 1, sds->active_color[0], sds->active_color[1], sds->active_color[2], 10.0);
}
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 (tex_flame) {
GPU_texture_bind(tex_flame, 2);
GPU_texture_bind(tex_spec, 3);
}
if (!GPU_non_power_of_two_support()) {
cor[0] = (float)res[0] / (float)power_of_2_max_u(res[0]);
cor[1] = (float)res[1] / (float)power_of_2_max_u(res[1]);
cor[2] = (float)res[2] / (float)power_of_2_max_u(res[2]);
}
cor[0] /= size[0];
cor[1] /= size[1];
cor[2] /= size[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 = (fabsf(viewnormal[0]) * size[0] + fabsf(viewnormal[1]) * size[1] + fabsf(viewnormal[2]) * size[2]);
dd = max_fff(sds->global_size[0], sds->global_size[1], sds->global_size[2]) / 128.f;
n = 0;
good_index = i;
// printf("d0: %f, dd: %f, ds: %f\n\n", d0, dd, ds);
points = MEM_callocN(sizeof(*points) * 12, "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[0]);
/* 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], points[i])) {
swap_v3_v3(points[i], points[j]);
}
}
}
/* render fire slice */
if (use_fire) {
if (GLEW_VERSION_1_4)
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_ONE, GL_ONE);
else
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
GPU_program_parameter_4f(smoke_program, 2, 1.0, 0.0, 0.0, 0.0);
glBegin(GL_POLYGON);
glColor3f(1.0, 1.0, 1.0);
for (i = 0; i < numpoints; i++) {
glTexCoord3d((points[i][0] - min[0]) * cor[0],
(points[i][1] - min[1]) * cor[1],
(points[i][2] - min[2]) * cor[2]);
glVertex3f(points[i][0] * ob_sizei[0],
points[i][1] * ob_sizei[1],
points[i][2] * ob_sizei[2]);
}
glEnd();
}
/* render smoke slice */
if (GLEW_VERSION_1_4)
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
else
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
GPU_program_parameter_4f(smoke_program, 2, -1.0, 0.0, 0.0, 0.0);
glBegin(GL_POLYGON);
glColor3f(1.0, 1.0, 1.0);
for (i = 0; i < numpoints; i++) {
glTexCoord3d((points[i][0] - min[0]) * cor[0],
(points[i][1] - min[1]) * cor[1],
(points[i][2] - min[2]) * cor[2]);
glVertex3f(points[i][0] * ob_sizei[0],
points[i][1] * ob_sizei[1],
points[i][2] * ob_sizei[2]);
}
glEnd();
}
n++;
}
#ifdef DEBUG_DRAW_TIME
printf("Draw Time: %f\n", (float)TIMEIT_VALUE(draw));
TIMEIT_END(draw);
#endif
if (tex_shadow)
GPU_texture_unbind(tex_shadow);
GPU_texture_unbind(tex);
if (tex_flame) {
GPU_texture_unbind(tex_flame);
GPU_texture_unbind(tex_spec);
}
GPU_texture_free(tex_spec);
free(spec_data);
free(spec_pixels);
if (smoke_program)
GPU_program_unbind(smoke_program);
MEM_freeN(points);
if (!gl_blend) {
glDisable(GL_BLEND);
}
if (gl_depth) {
glEnable(GL_DEPTH_TEST);
}
}