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comparison vdp.c @ 1653:858d52140375

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Small optimization to render_map
author Michael Pavone <pavone@retrodev.com>
date Thu, 27 Dec 2018 10:40:24 -0800
parents d0a69348add8
children 3128d4e0bc68
comparison
equal deleted inserted replaced
1652:d0a69348add8 1653:858d52140375
1206 if (col & MAP_BIT_V_FLIP) { 1206 if (col & MAP_BIT_V_FLIP) {
1207 address += vflip_base - 4 * context->v_offset; 1207 address += vflip_base - 4 * context->v_offset;
1208 } else { 1208 } else {
1209 address += 4 * context->v_offset; 1209 address += 4 * context->v_offset;
1210 } 1210 }
1211 uint16_t pal_priority = (col >> 9) & 0x70; 1211 uint8_t pal_priority = (col >> 9) & 0x70;
1212 int32_t dir; 1212 uint32_t bits = *((uint32_t *)(&context->vdpmem[address]));
1213 if (col & MAP_BIT_H_FLIP) { 1213 if (col & MAP_BIT_H_FLIP) {
1214 offset += 7; 1214 uint32_t shift = 28;
1215 offset &= SCROLL_BUFFER_MASK; 1215 for (int i = 0; i < 8; i++)
1216 dir = -1; 1216 {
1217 } else { 1217 tmp_buf[offset++] = pal_priority | ((bits >> shift) & 0xF);
1218 dir = 1; 1218 shift -= 4;
1219 } 1219 offset &= SCROLL_BUFFER_MASK;
1220 for (uint32_t i=0; i < 4; i++, address++) 1220 }
1221 { 1221 } else {
1222 tmp_buf[offset] = pal_priority | (context->vdpmem[address] >> 4); 1222 for (int i = 0; i < 4; i++)
1223 offset += dir; 1223 {
1224 offset &= SCROLL_BUFFER_MASK; 1224 uint8_t right = pal_priority | (bits & 0xF);
1225 tmp_buf[offset] = pal_priority | (context->vdpmem[address] & 0xF); 1225 bits >>= 4;
1226 offset += dir; 1226 tmp_buf[offset++] = pal_priority | (bits & 0xF);
1227 offset &= SCROLL_BUFFER_MASK; 1227 offset &= SCROLL_BUFFER_MASK;
1228 bits >>= 4;
1229 tmp_buf[offset++] = right;
1230 offset &= SCROLL_BUFFER_MASK;
1231 }
1228 } 1232 }
1229 } 1233 }
1230 1234
1231 static void render_map_1(vdp_context * context) 1235 static void render_map_1(vdp_context * context)
1232 { 1236 {