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comparison vdp.c @ 190:4cb8a3891e26

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Small fix to bg drawing that yields the proper res for direct color DMA
author Mike Pavone <pavone@retrodev.com>
date Mon, 14 Jan 2013 02:13:14 -0800
parents 806c3b7a6f2a
children 1b4d856b067a
comparison
equal deleted inserted replaced
189:806c3b7a6f2a 190:4cb8a3891e26
927 uint16_t * start = NULL, *end = NULL; 927 uint16_t * start = NULL, *end = NULL;
928 uint32_t linecyc = (context->cycles % MCLKS_LINE); 928 uint32_t linecyc = (context->cycles % MCLKS_LINE);
929 if (context->latched_mode & BIT_H40) { 929 if (context->latched_mode & BIT_H40) {
930 linecyc /= 16; 930 linecyc /= 16;
931 if (linecyc >= 50 && linecyc < 210) { 931 if (linecyc >= 50 && linecyc < 210) {
932 uint32_t x = ((linecyc-50)&(~0x1))*2; 932 uint32_t x = (linecyc-50)*2;
933 start = context->framebuf + line * 320 + x; 933 start = context->framebuf + line * 320 + x;
934 end = start + 4; 934 end = start + 2;
935 } 935 }
936 } else { 936 } else {
937 linecyc /= 20; 937 linecyc /= 20;
938 if (linecyc >= 43 && linecyc < 171) { 938 if (linecyc >= 43 && linecyc < 171) {
939 uint32_t x = ((linecyc-48)&(~0x1))*2; 939 uint32_t x = (linecyc-43)*2;
940 start = context->framebuf + line * 256 + x; 940 start = context->framebuf + line * 256 + x;
941 end = start + 4; 941 end = start + 2;
942 } 942 }
943 } 943 }
944 uint16_t color = context->cram[context->regs[REG_BG_COLOR] & 0x3F]; 944 uint16_t color = context->cram[context->regs[REG_BG_COLOR] & 0x3F];
945 while (start != end) { 945 while (start != end) {
946 *start = color; 946 *start = color;