152 lines
2.8 KiB
C
152 lines
2.8 KiB
C
//video.c
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// 08/13/03 Josh Holtrop
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ModeInfoBlock video_mode;
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byte *vid_ptr24;
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word *vid_ptr16;
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dword *vid_ptr32;
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void video_init(ModeInfoBlock *mib)
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{
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video_mode = *mib;
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switch(video_mode.BitsPerPixel)
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{
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case 16:
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vid_ptr16 = (word *) video_mode.PhysBasePtr;
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break;
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case 24:
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vid_ptr24 = (byte *) video_mode.PhysBasePtr;
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break;
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case 32:
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vid_ptr32 = (dword *) video_mode.PhysBasePtr;
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}
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dword tot = ((video_mode.XResolution) * (video_mode.YResolution));
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int a;
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for (a = 0; a < tot; a++)
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{
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if (a < (tot / 4))
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video_psetp(a, 0x00FF0000);
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else if (a < (tot / 2))
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video_psetp(a, 0x0000FF00);
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else if (a < ((tot * 3) / 4))
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video_psetp(a, 0x000000FF);
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else
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video_psetp(a, 0x00FFFFFF);
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}
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}
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void video_horiz(int y, int x1, int x2, dword color)
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{
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checkBoundsy(y);
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checkBoundsx(x1);
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checkBoundsx(x2);
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if (x1 > x2)
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{
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int tmp = x2;
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x2 = x1;
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x1 = tmp;
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}
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int pixel = y*video_mode.XResolution+x1;
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int a;
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for (a = 0; a <= (x2-x1); a++)
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{
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video_psetp(pixel, color);
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pixel++;
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}
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}
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void video_vert(int x, int y1, int y2, dword color)
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{
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checkBoundsx(x);
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checkBoundsy(y1);
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checkBoundsy(y2);
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if (y1 > y2)
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{
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int tmp = y2;
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y2 = y1;
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y1 = tmp;
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}
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int pixel = y1*video_mode.XResolution+x;
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int a;
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for (a = 0; a <= (y2-y1); a++)
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{
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video_psetp(pixel, color);
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pixel+=video_mode.XResolution;
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}
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}
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void video_rect(int x1, int y1, int x2, int y2, dword color)
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{
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checkBoundsx(x1);
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checkBoundsx(x2);
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checkBoundsy(y1);
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checkBoundsy(y2);
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if (x2 < x1)
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{
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int tmp = x2;
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x2 = x1;
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x1 = tmp;
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}
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if (y2 < y1)
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{
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int tmp = y2;
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y2 = y1;
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y1 = tmp;
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}
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video_horiz(y1, x1, x2, color);
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video_horiz(y2, x1, x2, color);
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video_vert(x1, y1, y2, color);
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video_vert(x2, y1, y2, color);
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}
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void video_rectf(int x1, int y1, int x2, int y2, dword color)
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{
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checkBoundsx(x1);
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checkBoundsx(x2);
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checkBoundsy(y1);
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checkBoundsy(y2);
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if (x2 < x1)
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{
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int tmp = x2;
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x2 = x1;
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x1 = tmp;
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}
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if (y2 < y1)
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{
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int tmp = y2;
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y2 = y1;
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y1 = tmp;
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}
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int a;
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for (a = 0; a <= (y2-y1); a++)
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video_horiz(y1+a, x1, x2, color);
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}
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inline void video_pset(int x, int y, dword color)
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{
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video_psetp(y*video_mode.XResolution+x, color);
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}
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void video_psetp(int pixel, dword color)
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{
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switch(video_mode.BitsPerPixel)
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{
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case 16:
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vid_ptr16[pixel] = ((color&0xFF)>>3) | ((((color>>8)&0xFF)>>2)<<5) | ((((color>>16)&0xFF)>>3)<<11);
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//vid_ptr16[pixel] = ((color&0xFF)>>3) | ((((color>>8)&0xFF)>>3)<<5) | ((((color>>16)&0xFF)>>3)<<10);
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break;
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case 24:
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vid_ptr24[pixel*3] = color & 0xFF;
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vid_ptr24[pixel*3+1] = (color>>8) & 0xFF;
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vid_ptr24[pixel*3+2] = (color>>16) & 0xFF;
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break;
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case 32:
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vid_ptr32[pixel] = color;
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}
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}
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