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authorVito Caputo <vcaputo@pengaru.com>2022-04-25 22:29:44 -0700
committerVito Caputo <vcaputo@pengaru.com>2022-04-25 22:31:21 -0700
commit35755c822a02ee15c21792b933a925338b3286d3 (patch)
tree927d6603f7cd2c5e3005aed972c4dbef4bbebb14
parent0c1e61f0a7f949b8ec895ae714349fb781ea40fb (diff)
modules/flui2d: colorify the density field
This is a first approximation at introducing colors to flui2d, the emitter colors aren't really well tuned or anything yet.
-rw-r--r--src/modules/flui2d/flui2d.c45
1 files changed, 35 insertions, 10 deletions
diff --git a/src/modules/flui2d/flui2d.c b/src/modules/flui2d/flui2d.c
index bbd3567..ffeb883 100644
--- a/src/modules/flui2d/flui2d.c
+++ b/src/modules/flui2d/flui2d.c
@@ -24,7 +24,9 @@
typedef struct flui2d_t {
float u[SIZE], v[SIZE], u_prev[SIZE], v_prev[SIZE];
- float dens[SIZE], dens_prev[SIZE];
+ float dens_r[SIZE], dens_prev_r[SIZE];
+ float dens_g[SIZE], dens_prev_g[SIZE];
+ float dens_b[SIZE], dens_prev_b[SIZE];
float visc, diff, decay;
} flui2d_t;
@@ -253,7 +255,9 @@ static void flui2d_prepare_frame(void *context, unsigned ticks, unsigned n_cpus,
int x = (cos(r) * .4f + .5f) * (float)ROOT; /* figure eight pattern for the added densities */
int y = (sin(r * 2.f) * .4f + .5f) * (float)ROOT;
- ctxt->fluid.dens_prev[IX(x, y)] = 1.f;
+ ctxt->fluid.dens_prev_r[IX(x, y)] = .5f + cos(r) * .5f;
+ ctxt->fluid.dens_prev_g[IX(x, y)] = .5f + sin(r) * .5f;
+ ctxt->fluid.dens_prev_b[IX(x, y)] = .5f + cos(r * 2.f) * .5f;
/* This orientation for the added velocities at the added densities isn't trying to
* emulate any sort of physical relationship to the movement - it's just creating a variety
@@ -269,7 +273,10 @@ static void flui2d_prepare_frame(void *context, unsigned ticks, unsigned n_cpus,
#define FLUI2D_CLOCKGRID_STEP (ROOT/FLUI2D_CLOCKGRID_SIZE)
for (int y = FLUI2D_CLOCKGRID_STEP; y < ROOT; y += FLUI2D_CLOCKGRID_STEP) {
for (int x = FLUI2D_CLOCKGRID_STEP; x < ROOT; x += FLUI2D_CLOCKGRID_STEP, r += ctxt->clockstep * M_PI * 2) {
- ctxt->fluid.dens_prev[IX(x, y)] = 1.f;
+
+ ctxt->fluid.dens_prev_r[IX(x, y)] = .5f + cos(r) * .5f;
+ ctxt->fluid.dens_prev_g[IX(x, y)] = .5f + sin(r) * .5f;
+ ctxt->fluid.dens_prev_b[IX(x, y)] = .5f + cos(r * 2.f) * .5f;
ctxt->fluid.u_prev[IX(x, y)] = cos(r * 3.f);
ctxt->fluid.v_prev[IX(x, y)] = sin(r * 3.f);
@@ -285,7 +292,9 @@ static void flui2d_prepare_frame(void *context, unsigned ticks, unsigned n_cpus,
* a GLSL implementation for a fragment shader.
*/
vel_step(ROOT, ctxt->fluid.u, ctxt->fluid.v, ctxt->fluid.u_prev, ctxt->fluid.v_prev, ctxt->fluid.visc, .1f);
- dens_step(ROOT, ctxt->fluid.dens, ctxt->fluid.dens_prev, ctxt->fluid.u, ctxt->fluid.v, ctxt->fluid.diff, ctxt->fluid.decay, .1f);
+ dens_step(ROOT, ctxt->fluid.dens_r, ctxt->fluid.dens_prev_r, ctxt->fluid.u, ctxt->fluid.v, ctxt->fluid.diff, ctxt->fluid.decay, .1f);
+ dens_step(ROOT, ctxt->fluid.dens_g, ctxt->fluid.dens_prev_g, ctxt->fluid.u, ctxt->fluid.v, ctxt->fluid.diff, ctxt->fluid.decay, .1f);
+ dens_step(ROOT, ctxt->fluid.dens_b, ctxt->fluid.dens_prev_b, ctxt->fluid.u, ctxt->fluid.v, ctxt->fluid.diff, ctxt->fluid.decay, .1f);
ctxt->xf = 1.f / fragment->frame_width;
ctxt->yf = 1.f / fragment->frame_height;
@@ -315,14 +324,30 @@ static void flui2d_render_fragment(void *context, unsigned ticks, unsigned cpu,
x1 = x0 + 1;
/* linear interpolation of density samples */
- dx0 = ctxt->fluid.dens[(int)IX(x0, y0)] * (1.f - (X - x0));
- dx0 += ctxt->fluid.dens[(int)IX(x1, y0)] * (X - x0);
- dx1 = ctxt->fluid.dens[(int)IX(x0, y1)] * (1.f - (X - x0));
- dx1 += ctxt->fluid.dens[(int)IX(x1, y1)] * (X - x0);
+ dx0 = ctxt->fluid.dens_r[(int)IX(x0, y0)] * (1.f - (X - x0));
+ dx0 += ctxt->fluid.dens_r[(int)IX(x1, y0)] * (X - x0);
+ dx1 = ctxt->fluid.dens_r[(int)IX(x0, y1)] * (1.f - (X - x0));
+ dx1 += ctxt->fluid.dens_r[(int)IX(x1, y1)] * (X - x0);
+ dens = dx0 * (1.f - (Y - y0)) + dx1 * (Y - y0);
+
+ pixel = ((uint32_t)((float)dens * 256.f)) << 16;
+
+ dx0 = ctxt->fluid.dens_g[(int)IX(x0, y0)] * (1.f - (X - x0));
+ dx0 += ctxt->fluid.dens_g[(int)IX(x1, y0)] * (X - x0);
+ dx1 = ctxt->fluid.dens_g[(int)IX(x0, y1)] * (1.f - (X - x0));
+ dx1 += ctxt->fluid.dens_g[(int)IX(x1, y1)] * (X - x0);
dens = dx0 * (1.f - (Y - y0)) + dx1 * (Y - y0);
- pixel = ((float)dens * 256.f);
- pixel = pixel << 16 | pixel << 8 | pixel;
+ pixel |= ((uint32_t)((float)dens * 256.f)) << 8;
+
+ dx0 = ctxt->fluid.dens_b[(int)IX(x0, y0)] * (1.f - (X - x0));
+ dx0 += ctxt->fluid.dens_b[(int)IX(x1, y0)] * (X - x0);
+ dx1 = ctxt->fluid.dens_b[(int)IX(x0, y1)] * (1.f - (X - x0));
+ dx1 += ctxt->fluid.dens_b[(int)IX(x1, y1)] * (X - x0);
+ dens = dx0 * (1.f - (Y - y0)) + dx1 * (Y - y0);
+
+ pixel |= ((uint32_t)((float)dens * 256.f));
+
til_fb_fragment_put_pixel_unchecked(fragment, x, y, pixel);
}
}
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