#include <assert.h>
#include <imago2.h>
#include "voxscape.h"
+#include "lut.h"
enum {
SLICELEN = 1
uint32_t *fb;
int fbwidth, fbheight;
int *coltop;
+ int horizon;
/* view */
int32_t x, y, angle;
int32_t *slicelen;
int proj_dist;
+ int zfog; /* fog start Z (0: no fog) */
+ int fogcolor[3];
+
unsigned int valid;
};
vox->xshift++;
}
- vox->vheight = 50;
+ vox->vheight = 80;
vox->proj_dist = 4; /* TODO */
return vox;
{
unsigned char *hpix;
uint32_t *cpix;
- int width, height, cwidth, cheight;
+ int i, width, height, cwidth, cheight;
struct voxscape *vox;
if(!(hpix = img_load_pixels(hfile, &width, &height, IMG_FMT_GREY8))) {
img_free_pixels(cpix);
return 0;
}
+
memcpy(vox->height, hpix, width * height);
- memcpy(vox->color, cpix, width * height * sizeof *vox->color);
+
+ for(i=0; i<width*height; i++) {
+ vox->color[i] = cpix[i] & 0xffffff; /* discard alpha */
+ }
img_free_pixels(hpix);
img_free_pixels(cpix);
free(vox);
}
-void vox_framebuf(struct voxscape *vox, int xres, int yres, uint32_t *fb)
+void vox_fog(struct voxscape *vox, int zstart, uint32_t color)
+{
+ vox->zfog = zstart;
+
+ vox->fogcolor[0] = color >> 16;
+ vox->fogcolor[1] = (color >> 8) & 0xff;
+ vox->fogcolor[2] = color & 0xff;
+}
+
+int vox_height(struct voxscape *vox, int32_t x, int32_t y)
+{
+ int tx = (x >> 16) & vox->xmask;
+ int ty = (y >> 16) & vox->ymask;
+
+ return vox->height[(ty << vox->xshift) + tx];
+}
+
+void vox_framebuf(struct voxscape *vox, int xres, int yres, uint32_t *fb, int horizon)
{
if(xres != vox->fbwidth) {
free(vox->coltop);
vox->fb = fb;
vox->fbwidth = xres;
vox->fbheight = yres;
+ vox->horizon = horizon >= 0 ? horizon : vox->fbheight / 2;
}
-void vox_view(struct voxscape *vox, int32_t x, int32_t y, int32_t angle)
+void vox_view(struct voxscape *vox, int32_t x, int32_t y, int h, int32_t angle)
{
+ if(h < 0) {
+ h = vox_height(vox, x, y) - h;
+ }
+
vox->x = x;
vox->y = y;
+ vox->vheight = h;
vox->angle = angle;
- /* TODO precalc stuff */
vox->valid &= ~SLICELEN;
}
{
int i;
- /*
- for(i=0; i<vox->fbwidth; i++) {
- vox->coltop[i] = vox->fbheight;
- }
- */
memset(vox->coltop, 0, vox->fbwidth * sizeof *vox->coltop);
if(!(vox->valid & SLICELEN)) {
float theta = (float)vox->fov * M_PI / 360.0f; /* half angle */
for(i=0; i<vox->nslices; i++) {
- vox->slicelen[i] = (int32_t)((vox->znear + i) * tan(theta) * 10.0f * 65536.0f);
+ vox->slicelen[i] = (int32_t)((vox->znear + i) * tan(theta) * 4.0f * 65536.0f);
}
vox->valid |= SLICELEN;
}
void vox_render_slice(struct voxscape *vox, int n)
{
- int i, j, tx, ty, hval, colstart, colheight;
- int32_t x, y, len, xstep;
+ int i, j, tx, ty, hval, colstart, colheight, z, r, g, b;
+ int32_t x, y, len, xstep, ystep, fog;
uint32_t color;
uint32_t *fbptr;
- len = vox->slicelen[n];
- xstep = len / vox->fbwidth;
+ if(vox->zfog > 0 && n > vox->zfog) {
+ fog = ((n - vox->zfog) << 8) / (vox->zfar - vox->zfog);
+ } else {
+ fog = 0;
+ }
- x = vox->x - xstep * (vox->fbwidth >> 1);
- y = vox->y + ((vox->znear + n) << 16);
+ z = vox->znear + n;
+
+ len = vox->slicelen[n] >> 8;
+ xstep = ((COS(vox->angle) >> 8) * len) / vox->fbwidth;
+ ystep = ((SIN(vox->angle) >> 8) * len) / vox->fbwidth;
+
+ x = vox->x - SIN(vox->angle) * z - xstep * (vox->fbwidth >> 1);
+ y = vox->y + COS(vox->angle) * z - ystep * (vox->fbwidth >> 1);
for(i=0; i<vox->fbwidth; i++) {
tx = (x >> 16) & vox->xmask;
ty = (y >> 16) & vox->ymask;
- hval = vox->height[(ty << vox->xshift) + tx] - 80;
- hval = hval * 80 / (vox->znear + n) + 250;
+ hval = vox->height[(ty << vox->xshift) + tx] - vox->vheight;
+ hval = hval * 160 / (vox->znear + n) + vox->horizon;
if(hval > vox->fbheight) hval = vox->fbheight;
if(hval > vox->coltop[i]) {
color = vox->color[(ty << vox->xshift) + tx];
colheight = hval - vox->coltop[i];
fbptr = vox->fb + colstart * vox->fbwidth + i;
+ if(fog > 0) {
+ r = color >> 16;
+ g = (color >> 8) & 0xff;
+ b = color & 0xff;
+ r = ((r << 8) + (vox->fogcolor[0] - r) * fog) >> 8;
+ g = ((g << 8) + (vox->fogcolor[1] - g) * fog) >> 8;
+ b = ((b << 8) + (vox->fogcolor[2] - b) * fog) >> 8;
+ color = (r << 16) | (g << 8) | b;
+ }
+
for(j=0; j<colheight; j++) {
*fbptr = color;
fbptr += vox->fbwidth;
}
x += xstep;
+ y += ystep;
+ }
+}
+
+void vox_sky_solid(struct voxscape *vox, uint32_t color)
+{
+ int i, j, colheight;
+ uint32_t *fbptr;
+
+ for(i=0; i<vox->fbwidth; i++) {
+ fbptr = vox->fb + i;
+ colheight = vox->fbheight - vox->coltop[i];
+ for(j=0; j<colheight; j++) {
+ *fbptr = color;
+ fbptr += vox->fbwidth;
+ }
}
}
{
int i, j, colheight, t;
int r0, g0, b0, r1, g1, b1, r, g, b;
- int d = vox->fbheight - 250;
+ int d = vox->fbheight - vox->horizon;
uint32_t *grad, *fbptr;
grad = alloca(vox->fbheight * sizeof *grad);