Mercurial > repos > blastem

comparison vdp.c @ 180:8b846bcff6a2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fix rendering of sprites at the top edge of screen
author Mike Pavone <pavone@retrodev.com>
date Tue, 08 Jan 2013 09:34:46 -0800
parents 6b593ea0ed90
children 806c3b7a6f2a
comparison
equal deleted inserted replaced
179:68af8a56ab7a 180:8b846bcff6a2
80 return; 80 return;
81 } 81 }
82 //TODO: Read from SAT cache rather than from VRAM 82 //TODO: Read from SAT cache rather than from VRAM
83 uint16_t sat_address = (context->regs[REG_SAT] & 0x7F) << 9; 83 uint16_t sat_address = (context->regs[REG_SAT] & 0x7F) << 9;
84 uint16_t address = context->sprite_index * 8 + sat_address; 84 uint16_t address = context->sprite_index * 8 + sat_address;
85 int16_t y = ((context->vdpmem[address] & 0x3) << 8 | context->vdpmem[address+1]) - 128; 85 line += 128;
86 uint16_t y = ((context->vdpmem[address] & 0x3) << 8 | context->vdpmem[address+1]);
86 uint8_t height = ((context->vdpmem[address+2] & 0x3) + 1) * 8; 87 uint8_t height = ((context->vdpmem[address+2] & 0x3) + 1) * 8;
87 //printf("Sprite %d | y: %d, height: %d\n", context->sprite_index, y, height); 88 //printf("Sprite %d | y: %d, height: %d\n", context->sprite_index, y, height);
88 if (y <= line && line < (y + height)) { 89 if (y <= line && line < (y + height)) {
89 //printf("Sprite %d at y: %d with height %d is on line %d\n", context->sprite_index, y, height, line); 90 //printf("Sprite %d at y: %d with height %d is on line %d\n", context->sprite_index, y, height, line);
90 context->sprite_info_list[--(context->slot_counter)].size = context->vdpmem[address+2]; 91 context->sprite_info_list[--(context->slot_counter)].size = context->vdpmem[address+2];
91 context->sprite_info_list[context->slot_counter].index = context->sprite_index; 92 context->sprite_info_list[context->slot_counter].index = context->sprite_index;
92 context->sprite_info_list[context->slot_counter].y = y; 93 context->sprite_info_list[context->slot_counter].y = y-128;
93 } 94 }
94 context->sprite_index = context->vdpmem[address+3] & 0x7F; 95 context->sprite_index = context->vdpmem[address+3] & 0x7F;
95 if (context->sprite_index && context->slot_counter) 96 if (context->sprite_index && context->slot_counter)
96 { 97 {
97 address = context->sprite_index * 8 + sat_address; 98 address = context->sprite_index * 8 + sat_address;
98 y = ((context->vdpmem[address] & 0x3) << 8 | context->vdpmem[address+1]) - 128; 99 y = ((context->vdpmem[address] & 0x3) << 8 | context->vdpmem[address+1]);
99 height = ((context->vdpmem[address+2] & 0x3) + 1) * 8; 100 height = ((context->vdpmem[address+2] & 0x3) + 1) * 8;
100 if (y <= line && line < (y + height)) { 101 if (y <= line && line < (y + height)) {
101 //printf("Sprite %d at y: %d with height %d is on line %d\n", context->sprite_index, y, height, line); 102 //printf("Sprite %d at y: %d with height %d is on line %d\n", context->sprite_index, y, height, line);
102 context->sprite_info_list[--(context->slot_counter)].size = context->vdpmem[address+2]; 103 context->sprite_info_list[--(context->slot_counter)].size = context->vdpmem[address+2];
103 context->sprite_info_list[context->slot_counter].index = context->sprite_index; 104 context->sprite_info_list[context->slot_counter].index = context->sprite_index;
104 context->sprite_info_list[context->slot_counter].y = y; 105 context->sprite_info_list[context->slot_counter].y = y-128;
105 } 106 }
106 context->sprite_index = context->vdpmem[address+3] & 0x7F; 107 context->sprite_index = context->vdpmem[address+3] & 0x7F;
107 } 108 }
108 } 109 }
109 } 110 }