134 lines
3.8 KiB
C++
134 lines
3.8 KiB
C++
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// R_draw.c
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#include <math.h>
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#include "D_global.h"
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#include "R_refdef.h"
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/* */
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/*==================== */
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/*= */
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/*= ScalePost */
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/*= */
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/*= Primitive scaling operation, coordinates must be clipped */
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/*= */
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/*= Imp1emented on the IBM by jumping into an unwound loop */
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/*= The destination address is the BOTTOM pixel, but the texture start i*/
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/*= pixel (bottom+1-count) */
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/*= */
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/*==================== */
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/* */
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byte *sp_dest; // the bottom most pixel to be drawn (in vie
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byte *sp_source; // the first pixel in the vertical post (may
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byte *sp_colormap; // pointer to a 256 byte color number to pal
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int sp_frac; // fixed point location past sp_source
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int sp_fracstep; // fixed point step value
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int sp_count; // the number of pixels to draw
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void ScalePost(void)
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{
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//return; // debug
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#ifdef VALIDATE
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if (sp_count<1)
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MS_Error("sp_count < 1");
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if (sp_dest>(viewbuffer+windowWidth*windowHeight))
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MS_Error("sp_dest > viewbuffer+windowWidth*windowHeight");
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#endif
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sp_dest -= windowWidth*(sp_count-1); // go to the top
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#ifdef VALIDATE
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if (sp_dest<viewbuffer)
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MS_Error("sp_dest > viewbuffer");
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#endif
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while (sp_count--) {
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*sp_dest=sp_colormap[sp_source[sp_frac>>FRACBITS]];
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sp_dest += windowWidth;
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sp_frac += sp_fracstep;
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}
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}
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/* */
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/*==================== */
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/*= */
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/*= ScaleMaskedPost */
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/*= */
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/*= Primitive scaling operation, coordinates must be clipped */
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/*= */
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/*= Imp1emented on the IBM by jumping into an unwound loop */
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/*= The destination address is the BOTTOM pixel, but the texture start i*/
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/*= pixel (bottom+1-count) */
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/*= */
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/*==================== */
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/* */
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void ScaleMaskedPost(void)
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{
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pixel_t color;
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#ifdef VALIDATE
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if (sp_count<1)
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MS_Error("sp_count < 1");
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if (sp_dest>(viewbuffer+windowWidth*windowHeight)
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MS_Error("sp_dest > viewbuffer+windowWidth*windowHeight");
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#endif
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sp_dest -= windowWidth*(sp_count-1); // go to the top
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#ifdef VALIDATE
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if (sp_dest<viewbuffer)
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MS_Error("sp_dest > viewbuffer");
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#endif
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while (sp_count--) {
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color=sp_source[sp_frac>>FRACBITS];
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if (color)
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*sp_dest=sp_colormap[color];
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sp_dest += windowWidth;
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sp_frac += sp_fracstep;
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}
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}
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/* */
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/*==================== */
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/*= */
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/*= MapRow */
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/*= */
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/*= Primitive scaling operation, coordinates must be clipped */
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/*= */
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/*= The destination address and texture spot are for the */
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/*= leftmost (first) pixel */
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/*= */
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/*==================== */
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/* */
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byte *mr_dest; // the left most pixel to be drawn (in viewb
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byte *mr_picture; // pointer to a raw 64*64 pixel picture
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byte *mr_colormap; // pointer to a 256 byte color number to pal
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int mr_xfrac; // starting texture coordinate
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int mr_yfrac; // starting texture coordinate
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int mr_xstep; // fixed point step value
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int mr_ystep; // fixed point step value
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int mr_count; // the number of pixels to draw
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void MapRow(void)
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{
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int spot;
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//return; // debug
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#ifdef VALIDATE
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if (mr_count<1)
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MS_Error("mr_count < 1");
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if (!mr_colormap)
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return;
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if ((mr_dest<viewbuffer)||(mr_dest+mr_count>viewbuffer+windowSize))
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MS_Error("bad destination for MapRow");
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#endif
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while (mr_count--) {
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spot=((mr_yfrac>>(FRACBITS-6))&(63*64))+((mr_xfrac>>FRACBITS)&63);
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*mr_dest++=mr_colormap[mr_picture[spot]];
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mr_xfrac+=mr_xstep;
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mr_yfrac+=mr_ystep;
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}
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}
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