int flush_dma() {
dma_data.count = pbuf - dma_data.virt_base;
if(version == 1) {
// Start the DMA transfer
while(EVAL_CONTROL(DMACount) != 0) ;
LOAD_CONTROL(DMAAddress, glint_board.dmagob[dma_num].phys_base);
LOAD_CONTROL(DMACount, dma_data.count);
// Switch to the other DMA buffer
dma_num = (dma_num == 0)?1:0;
pbuf = dma_data.virt_base =
glint_board.dmagob[dma_num].virt_base;
} else {
// Start the DMA transfer and get the new virtual base
ioctl(fd, START_DMA, &dma_data);
pbuf = dma_data.virt_base;
}
return GRAPH3D_OK;
}
int draw_color_tri(
int x1, int y1, GraphicsColor c1,
int x2, int y2, GraphicsColor c2,
int x3, int y3, GraphicsColor c3) {
int c;
int drdy, dgdy, dbdy;
int drdx, dgdx, dbdx;
c1.r <<= 15; c2.r <<= 15; c3.r <<= 15;
c1.g <<= 15; c2.g <<= 15; c3.g <<= 15;
c1.b <<= 15; c2.b <<= 15; c3.b <<= 15;
c = abs((x1 - x3)*(y2-y3) - (x2-x3)*(y1-y3));
drdy = (c3.r-c1.r)/(y3-y1);
dgdy = (c3.g-c1.g)/(y3-y1);
dbdy = (c3.b-c1.b)/(y3-y1);
// Without these casts, we can run into overflow problems
drdx = ((long long)(c1.r - c3.r)*(y2-y3)/c) -
((long long)(c2.r-c3.r)*(y1-y3)/c);
dgdx = ((long long)(c1.g - c3.g)*(y2-y3)/c) -
((long long)(c2.g-c3.g)*(y1-y3)/c);
dbdx = ((long long)(c1.b - c3.b)*(y2-y3)/c) -
((long long)(c2.b-c3.b)*(y1-y3)/c);
// Set up color
printf("%d\n%d %d %d\n", c, c1.r, c1.g, c1.b);
printf("%lld %lld %lld\n%d %d %d\n", drdx, dgdx, dbdx, drdy, dgdy, dbdy);
LOAD_CONTROL(RStart, c1.r);
LOAD_CONTROL(GStart, c1.g);
LOAD_CONTROL(BStart, c1.b);
LOAD_CONTROL(dRdyDom, drdy);
LOAD_CONTROL(dGdyDom, dgdy);
LOAD_CONTROL(dBdyDom, dbdy);
LOAD_CONTROL(dRdx, drdx);
LOAD_CONTROL(dGdx, dgdx);
LOAD_CONTROL(dBdx, dbdx);
// Set up the top half of the triangle
LOAD_CONTROL(StartXDom, x1 << 16);
LOAD_CONTROL(dXDom, ((x3 - x1)<<16) / (y3 - y1));
LOAD_CONTROL(StartXSub, x1 << 16);
LOAD_CONTROL(dXSub, ((x2 - x1)<<16) / (y2 - y1));
LOAD_CONTROL(StartY, y1 << 16);
LOAD_CONTROL(dY, 1 << 16);
LOAD_CONTROL(Count, abs(y2 - y1));
LOAD_CONTROL(Render, RENDER_TRAPEZOID_SPC);
// Draw the second half of the triangle
LOAD_CONTROL(StartXSub, x2 << 16);
LOAD_CONTROL(dXSub, ((x3 - x2)<<16) / (y3 - y2));
LOAD_CONTROL(ContinueNewSub, abs(y3 - y2));
return GRAPHICS_OK;
}
int draw_rect(int x1, int y1, int x2, int y2) {
// Set up constant color
LOAD_CONTROL(RStart, gp.draw_color.r);
LOAD_CONTROL(GStart, gp.draw_color.g);
LOAD_CONTROL(BStart, gp.draw_color.b);
// LOAD_CONTROL(AStart, 0);
LOAD_CONTROL(dRdx, 0);
LOAD_CONTROL(dGdx, 0);
LOAD_CONTROL(dBdx, 0);
// LOAD_CONTROL(dAdx, 0);
LOAD_CONTROL(dRdyDom, 0);
LOAD_CONTROL(dGdyDom, 0);
LOAD_CONTROL(dBdyDom, 0);
// LOAD_CONTROL(dAdyDom, 0);
LOAD_CONTROL(StartXDom, x1 << 16);
LOAD_CONTROL(StartXSub, x2 << 16);
LOAD_CONTROL(dXDom, 0);
LOAD_CONTROL(dXSub, 0);
LOAD_CONTROL(Count, y2 - y1);
LOAD_CONTROL(YStart, y1 << 16);
LOAD_CONTROL(dY, 1 << 16);
LOAD_CONTROL(Render, RENDER_TRAPEZOID_SPC);
return GRAPHICS_OK;
}
