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comparison src/vdp.c @ 23:a085f17b79e9

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Implement hflip
author Michael Pavone <pavone@retrodev.com>
date Wed, 30 Mar 2016 20:31:04 -0700
parents 407725d9a02f
children 083347ccd508
comparison
equal deleted inserted replaced
22:407725d9a02f 23:a085f17b79e9
46 context->current_draw = 0; 46 context->current_draw = 0;
47 } 47 }
48 if (context->draw_counter) { 48 if (context->draw_counter) {
49 context->draw_counter--; 49 context->draw_counter--;
50 uint16_t pixels = context->vram[context->draw_source++]; 50 uint16_t pixels = context->vram[context->draw_source++];
51 for (int i = 0; i < 4; i++) 51 for (int i = context->hflip ? 0 : 12; i >= 0 && i < 16; i+= context->hflip ? 4 : -4)
52 { 52 {
53 uint8_t pixel = ((pixels >> ((3-i) * 4)) & 0xF) | context->palpriority; 53 uint8_t pixel = ((pixels >> i) & 0xF) | context->palpriority;
54 context->drawbuffer[context->draw_dest++] = pixel; 54 context->drawbuffer[context->draw_dest ^ (context->hflip << 2)] = pixel;
55 context->draw_dest++;
55 } 56 }
56 } else { 57 } else {
57 //00VV VVVV VVHH HHHH 58 //00VV VVVV VVHH HHHH
58 uint16_t vpos = (context->vscroll & 0x7FF) + context->vcounter - 16; 59 uint16_t vpos = (context->vscroll & 0x7FF) + context->vcounter - 16;
59 uint16_t vmask = (context->vscroll >> 2) & 0x3E00; 60 uint16_t vmask = (context->vscroll >> 2) & 0x3E00;
69 } else { 70 } else {
70 context->draw_source += vfine * 2; 71 context->draw_source += vfine * 2;
71 } 72 }
72 context->palpriority = entry >> 9 & 0x70; 73 context->palpriority = entry >> 9 & 0x70;
73 context->draw_counter = 2; 74 context->draw_counter = 2;
74 //TODO: handle horizontal flip 75 context->hflip = (entry & 0x800) != 0;
75 } 76 }
76 if (context->status & VDP_STATUS_SPRITE_SCAN) { 77 if (context->status & VDP_STATUS_SPRITE_SCAN) {
77 context->status |= VDP_STATUS_SRAM; 78 context->status |= VDP_STATUS_SRAM;
78 uint16_t pos = context->sram[context->hcounter]; 79 uint16_t pos = context->sram[context->hcounter];
79 uint16_t y = pos & 0xFF; 80 uint16_t y = pos & 0xFF;
97 if (size == 16) { 98 if (size == 16) {
98 context->sprite_draws[context->current_draw].source = address + 32; 99 context->sprite_draws[context->current_draw].source = address + 32;
99 context->sprite_draws[context->current_draw].x = x + 8; 100 context->sprite_draws[context->current_draw].x = x + 8;
100 context->sprite_draws[context->current_draw].hflip = (atts & 0x800) != 0; 101 context->sprite_draws[context->current_draw].hflip = (atts & 0x800) != 0;
101 context->sprite_draws[context->current_draw].palpriority = 0x80 | (atts >> 9 & 0x50); 102 context->sprite_draws[context->current_draw].palpriority = 0x80 | (atts >> 9 & 0x50);
103 if (context->sprite_draws[context->current_draw].hflip) {
104 context->sprite_draws[context->current_draw].x -= 8;
105 context->sprite_draws[context->current_draw-1].x += 8;
106 }
102 } 107 }
103 context->current_draw++; 108 context->current_draw++;
104 if (context->current_draw == 40) { 109 if (context->current_draw == 40) {
105 //no more rendering capacity 110 //no more rendering capacity
106 context->status &= ~VDP_STATUS_SPRITE_SCAN; 111 context->status &= ~VDP_STATUS_SPRITE_SCAN;
117 sprite_draw *draw = context->sprite_draws + (context->current_draw >> 1); 122 sprite_draw *draw = context->sprite_draws + (context->current_draw >> 1);
118 if (draw->palpriority) { 123 if (draw->palpriority) {
119 context->status |= VDP_STATUS_VRAM; 124 context->status |= VDP_STATUS_VRAM;
120 uint16_t pixels = context->vram[draw->source + (context->current_draw & 1)]; 125 uint16_t pixels = context->vram[draw->source + (context->current_draw & 1)];
121 uint16_t x = draw->x - 16 + (context->hscroll & 7); 126 uint16_t x = draw->x - 16 + (context->hscroll & 7);
122 for (int i = 0; i < 4; i++, x++) 127 for (int i = draw->hflip ? 0 : 12; i >= 0 && i < 16; i+= draw->hflip ? 4 : -4, x++)
123 { 128 {
124 //TODO: handle horizontal flip 129 uint8_t pixel = (pixels >> i) & 0xF;
125 uint8_t pixel = (pixels >> ((3-i) * 4)) & 0xF;
126 if (pixel && x < 328 && ((draw->palpriority & 0x40) || !(context->drawbuffer[x] & 0x40))) { 130 if (pixel && x < 328 && ((draw->palpriority & 0x40) || !(context->drawbuffer[x] & 0x40))) {
127 context->drawbuffer[x] = pixel | draw->palpriority; 131 context->drawbuffer[x ^ (draw->hflip << 2)] = pixel | draw->palpriority;
128 } 132 }
129 } 133 }
130 if (context->current_draw & 1) { 134 if (context->current_draw & 1) {
131 draw->palpriority = 0; 135 draw->palpriority = 0;
132 } else { 136 } else {