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comparison vdp.c @ 31:25016576b5f3

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Make horizontal scrolling closer to correct, Comix Zone looks good, Sonic 2 slightly off
author Mike Pavone <pavone@retrodev.com>
date Sat, 08 Dec 2012 20:25:56 -0800
parents 03f9bb57cc54
children 8602ad493794
comparison
equal deleted inserted replaced
30:03f9bb57cc54 31:25016576b5f3
178 v_mul = 256; 178 v_mul = 256;
179 break; 179 break;
180 } 180 }
181 uint16_t hscroll, offset; 181 uint16_t hscroll, offset;
182 for (int i = 0; i < 2; i++) { 182 for (int i = 0; i < 2; i++) {
183 hscroll = (hscroll_val + (column + i) * 8) & hscroll_mask; 183 hscroll = ((column - 2 + i) * 8 - hscroll_val) & hscroll_mask;
184 offset = address + ((vscroll * v_mul + hscroll/4) & 0x1FFF); 184 offset = address + ((vscroll * v_mul + hscroll/4) & 0x1FFF);
185 //printf("%s | line: %d, col: %d, x: %d, hs_mask %X, v_mul: %d, scr reg: %X, tbl addr: %X\n", (vsram_off ? "B" : "A"), line, (column-(2-i)), hscroll, hscroll_mask, v_mul, context->regs[REG_SCROLL], offset); 185 //printf("%s | line: %d, col: %d, x: %d, hs_mask %X, v_mul: %d, scr reg: %X, tbl addr: %X\n", (vsram_off ? "B" : "A"), line, (column-(2-i)), hscroll, hscroll_mask, v_mul, context->regs[REG_SCROLL], offset);
186 uint16_t col_val = (context->vdpmem[offset] << 8) | context->vdpmem[offset+1]; 186 uint16_t col_val = (context->vdpmem[offset] << 8) | context->vdpmem[offset+1];
187 if (i) { 187 if (i) {
188 context->col_2 = col_val; 188 context->col_2 = col_val;