int step_text(struct stl_reader *r)
{
float norm[3], pnt[3];
int j, vertices[3];
clock_t begin, end;
unsigned usec;
assert(r!=NULL);
begin = clock();
step_text_again:
if (read_text_vector(r, nl, norm)) {
return 1;
}
for (j=0; j<3; j++) {
if (read_text_vector(r, vt, pnt)) {
return 1;
}
vertices[j] = vertex_add(r, pnt);
}
facet_add(r, vertices, norm);
end = clock();
usec = end-begin;
if (usec < WORKSLICE)
goto step_text_again;
return 0;
}
int step_binary(struct stl_reader *r)
{
float *normal, *vertex1, *vertex2, *vertex3;
clock_t begin, end;
unsigned usec;
int vertices[3];
assert(r!=NULL);
begin = clock();
step_binary_again:
if ((r->ptr - r->buf + 50) > r->buflen) return 1;
normal = (float*) r->ptr; vertex1 = normal + 3;
vertex2 = vertex1 + 3; vertex3 = vertex2 + 3;
r->ptr += 50;
vertices[0] = vertex_add(r, vertex1);
vertices[1] = vertex_add(r, vertex2);
vertices[2] = vertex_add(r, vertex3);
facet_add(r, vertices, normal);
end = clock();
usec = end-begin;
if (usec < WORKSLICE)
goto step_binary_again;
return 0;
}
// 绘制扫描线
void device_draw_scanline(device_t *device, scanline_t *scanline) {
IUINT32 *framebuffer = device->framebuffer[scanline->y];
float *zbuffer = device->zbuffer[scanline->y];
int x = scanline->x;
int w = scanline->w;
int width = device->width;
int render_state = device->render_state;
for (; w > 0; x++, w--) {
if (x >= 0 && x < width) {
float rhw = scanline->v.rhw;
if (rhw >= zbuffer[x]) {
float w = 1.0f / rhw;
zbuffer[x] = rhw;
if (render_state & RENDER_STATE_COLOR) {
float r = scanline->v.color.r * w;
float g = scanline->v.color.g * w;
float b = scanline->v.color.b * w;
int R = (int)(r * 255.0f);
int G = (int)(g * 255.0f);
int B = (int)(b * 255.0f);
R = CMID(R, 0, 255);
G = CMID(G, 0, 255);
B = CMID(B, 0, 255);
framebuffer[x] = (R << 16) | (G << 8) | (B);
}
if (render_state & RENDER_STATE_TEXTURE) {
float u = scanline->v.tc.u * w;
float v = scanline->v.tc.v * w;
IUINT32 cc = device_texture_read(device, u, v);
framebuffer[x] = cc;
}
}
}
vertex_add(&scanline->v, &scanline->step);
if (x >= width) break;
}
}
