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Diffstat (limited to 'vdp.c')
-rw-r--r--vdp.c201
1 files changed, 119 insertions, 82 deletions
diff --git a/vdp.c b/vdp.c
index fa69188..1b3b187 100644
--- a/vdp.c
+++ b/vdp.c
@@ -41,6 +41,20 @@
#define VBLANK_START_H32 (LINE_CHANGE_H32+2)
#define FIFO_LATENCY 3
+#define BORDER_TOP_V24 27
+#define BORDER_TOP_V28 11
+#define BORDER_TOP_V24_PAL 54
+#define BORDER_TOP_V28_PAL 38
+#define BORDER_TOP_V30_PAL 30
+
+#define BORDER_BOT_V24 24
+#define BORDER_BOT_V28 8
+#define BORDER_BOT_V24_PAL 48
+#define BORDER_BOT_V28_PAL 32
+#define BORDER_BOT_V30_PAL 24
+
+#define INVALID_LINE 0x200
+
static int32_t color_map[1 << 12];
static uint16_t mode4_address_map[0x4000];
static uint32_t planar_to_chunky[256];
@@ -54,6 +68,40 @@ static uint8_t debug_base[][3] = {
{127, 0, 127} //Sprites
};
+static void update_video_params(vdp_context *context)
+{
+ if (context->regs[REG_MODE_2] & BIT_MODE_5) {
+ if (context->latched_mode & BIT_PAL) {
+ if (context->flags2 & FLAG2_REGION_PAL) {
+ context->inactive_start = PAL_INACTIVE_START;
+ context->border_top = BORDER_TOP_V30_PAL;
+ context->border_bot = BORDER_BOT_V30_PAL;
+ } else {
+ context->inactive_start = 0x200;
+ context->border_top = context->border_bot = 0;
+ }
+ } else {
+ context->inactive_start = NTSC_INACTIVE_START;
+ if (context->flags2 & FLAG2_REGION_PAL) {
+ context->border_top = BORDER_TOP_V28_PAL;
+ context->border_bot = BORDER_BOT_V28_PAL;
+ } else {
+ context->border_top = BORDER_TOP_V28;
+ context->border_bot = BORDER_TOP_V28;
+ }
+ }
+ } else {
+ context->inactive_start = MODE4_INACTIVE_START;
+ if (context->flags2 & FLAG2_REGION_PAL) {
+ context->border_top = BORDER_TOP_V24_PAL;
+ context->border_bot = BORDER_BOT_V24_PAL;
+ } else {
+ context->border_top = BORDER_TOP_V24;
+ context->border_bot = BORDER_BOT_V24;
+ }
+ }
+}
+
static uint8_t color_map_init_done;
void init_vdp_context(vdp_context * context, uint8_t region_pal)
@@ -67,7 +115,7 @@ void init_vdp_context(vdp_context * context, uint8_t region_pal)
context->output = malloc(LINEBUF_SIZE);
context->output_pitch = 0;
} else {
- context->output = render_get_framebuffer(FRAMEBUFFER_ODD, &context->output_pitch);
+ context->fb = render_get_framebuffer(FRAMEBUFFER_ODD, &context->output_pitch);
}
context->linebuf = malloc(LINEBUF_SIZE + SCROLL_BUFFER_SIZE*2);
memset(context->linebuf, 0, LINEBUF_SIZE + SCROLL_BUFFER_SIZE*2);
@@ -163,6 +211,10 @@ void init_vdp_context(vdp_context * context, uint8_t region_pal)
if (region_pal) {
context->flags2 |= FLAG2_REGION_PAL;
}
+ update_video_params(context);
+ if (!headless) {
+ context->output = (uint32_t *)(((char *)context->fb) + context->output_pitch * context->border_top);
+ }
}
void vdp_free(vdp_context *context)
@@ -1115,15 +1167,28 @@ static void fetch_map_mode4(uint16_t col, uint32_t line, vdp_context *context)
static void render_map_output(uint32_t line, int32_t col, vdp_context * context)
{
+ uint32_t *dst;
+ if (line == 0x1FF) {
+ if (!col) {
+ return;
+ }
+ col -= 2;
+ dst = context->output + col * 8;
+ uint32_t color = context->colors[context->regs[REG_BG_COLOR]];
+ for (int i = 0; i < 16; i++)
+ {
+ *(dst++) = color;
+ }
+ return;
+ }
if (line >= 240) {
return;
}
- render_map(context->col_2, context->tmp_buf_b, context->buf_b_off+8, context);
- uint32_t *dst;
uint8_t *sprite_buf, *plane_a, *plane_b;
int plane_a_off, plane_b_off;
if (col)
{
+ render_map(context->col_2, context->tmp_buf_b, context->buf_b_off+8, context);
col-=2;
dst = context->output + col * 8;
if (context->debug < 2) {
@@ -1373,7 +1438,7 @@ static uint32_t const h40_hsync_cycles[] = {19, 20, 20, 20, 18, 20, 20, 20, 18,
static void vdp_advance_line(vdp_context *context)
{
context->vcounter++;
- context->vcounter &= 0x1FF;
+
uint8_t is_mode_5 = context->regs[REG_MODE_2] & BIT_MODE_5;
if (is_mode_5) {
if (context->flags2 & FLAG2_REGION_PAL) {
@@ -1390,29 +1455,34 @@ static void vdp_advance_line(vdp_context *context)
} else if (context->vcounter == 0xDB) {
context->vcounter = 0x1D5;
}
- uint32_t inactive_start = (context->latched_mode & BIT_PAL ? PAL_INACTIVE_START : NTSC_INACTIVE_START);
- if (!is_mode_5) {
- inactive_start = MODE4_INACTIVE_START;
- }
- if (!headless) {
- if (!context->vcounter && !context->output) {
- context->output = render_get_framebuffer(context->flags2 & FLAG2_EVEN_FIELD ? FRAMEBUFFER_EVEN : FRAMEBUFFER_ODD, &context->output_pitch);
- context->h40_lines = 0;
- } else if (context->vcounter == inactive_start) { //TODO: Change this once border emulation is added
- context->output = NULL;
- render_framebuffer_updated(context->flags2 & FLAG2_EVEN_FIELD ? FRAMEBUFFER_EVEN: FRAMEBUFFER_ODD, context->h40_lines > inactive_start / 2 ? 320 : 256);
+ if (headless) {
+ context->vcounter &= 0x1FF;
+ } else {
+ if (context->vcounter == context->inactive_start) {
+ render_framebuffer_updated(context->flags2 & FLAG2_EVEN_FIELD ? FRAMEBUFFER_EVEN: FRAMEBUFFER_ODD, context->h40_lines > (context->inactive_start + context->border_top) / 2 ? 320 : 256);
if (context->double_res) {
context->flags2 ^= FLAG2_EVEN_FIELD;
}
- } else if (context->output) {
- context->output = (uint32_t *)(((char *)context->output) + context->output_pitch);
- if (context->regs[REG_MODE_4] & BIT_H40) {
- context->h40_lines++;
- }
+ context->fb = render_get_framebuffer(context->flags2 & FLAG2_EVEN_FIELD ? FRAMEBUFFER_EVEN : FRAMEBUFFER_ODD, &context->output_pitch);
+ context->h40_lines = 0;
+ context->frame++;
+ }
+ context->vcounter &= 0x1FF;
+ uint32_t output_line;
+ if (context->vcounter < context->inactive_start + context->border_bot) {
+ output_line = context->border_top + context->vcounter;
+ } else if (context->vcounter > 0x200 - context->border_top) {
+ output_line = context->vcounter - (0x200 - context->border_top);
+ } else {
+ output_line = INVALID_LINE;
+ }
+ context->output = (uint32_t *)(((char *)context->fb) + context->output_pitch * output_line);
+ if (output_line != INVALID_LINE && (context->regs[REG_MODE_4] & BIT_H40)) {
+ context->h40_lines++;
}
}
- if (context->vcounter > inactive_start) {
+ if (context->vcounter > context->inactive_start) {
context->hint_counter = context->regs[REG_HINT];
} else if (context->hint_counter) {
context->hint_counter--;
@@ -1673,7 +1743,7 @@ static void vdp_h40(vdp_context * context, uint32_t target_cycles)
scan_sprite_table(context->vcounter, context);//Just a guess
CHECK_LIMIT
case 0:
- if (context->vcounter == (context->latched_mode & BIT_PAL ? PAL_INACTIVE_START : NTSC_INACTIVE_START)) {
+ if (context->vcounter == context->inactive_start) {
context->flags2 |= FLAG2_VINT_PENDING;
context->pending_vint_start = context->cycles;
}
@@ -1721,7 +1791,7 @@ static void vdp_h40(vdp_context * context, uint32_t target_cycles)
case 164:
render_sprite_cells(context);
vdp_advance_line(context);
- if (context->vcounter == (context->latched_mode & BIT_PAL ? PAL_INACTIVE_START : NTSC_INACTIVE_START)) {
+ if (context->vcounter == context->inactive_start) {
context->hslot++;
context->cycles += slot_cycles;
return;
@@ -1876,7 +1946,7 @@ static void vdp_h32(vdp_context * context, uint32_t target_cycles)
case 132:
render_sprite_cells(context);
vdp_advance_line(context);
- if (context->vcounter == (context->latched_mode & BIT_PAL ? PAL_INACTIVE_START : NTSC_INACTIVE_START)) {
+ if (context->vcounter == context->inactive_start) {
context->hslot++;
context->cycles += slot_cycles;
return;
@@ -2016,6 +2086,7 @@ static void vdp_h32_mode4(vdp_context * context, uint32_t target_cycles)
void latch_mode(vdp_context * context)
{
context->latched_mode = context->regs[REG_MODE_2] & BIT_PAL;
+ update_video_params(context);
}
static void check_render_bg(vdp_context * context, int32_t line, uint32_t slot)
@@ -2031,7 +2102,9 @@ static void check_render_bg(vdp_context * context, int32_t line, uint32_t slot)
}
}
if (starti >= 0) {
- uint32_t color = context->colors[context->regs[REG_BG_COLOR]];
+ uint32_t color = (context->regs[REG_MODE_2] & BIT_MODE_5)
+ ? context->colors[context->regs[REG_BG_COLOR]]
+ : context->colors[CRAM_SIZE * 3 + 0x10 + (context->regs[REG_BG_COLOR] & 0xF)];
uint32_t * start = context->output + starti;
for (int i = 0; i < 2; i++) {
*(start++) = color;
@@ -2042,22 +2115,17 @@ static void check_render_bg(vdp_context * context, int32_t line, uint32_t slot)
void vdp_run_context(vdp_context * context, uint32_t target_cycles)
{
+ uint8_t is_h40 = context->regs[REG_MODE_4] & BIT_H40;
+ uint8_t mode_5 = context->regs[REG_MODE_2] & BIT_MODE_5;
while(context->cycles < target_cycles)
{
- uint8_t is_h40 = context->regs[REG_MODE_4] & BIT_H40;
- uint8_t active_slot, mode_5;
- uint32_t inactive_start;
- if (context->regs[REG_MODE_2] & BIT_MODE_5) {
- //Mode 5 selected
- mode_5 = 1;
- inactive_start = context->latched_mode & BIT_PAL ? PAL_INACTIVE_START : NTSC_INACTIVE_START;
+ uint8_t active_slot;
+ if (mode_5) {
//line 0x1FF is basically active even though it's not displayed
- active_slot = (context->vcounter < inactive_start || context->vcounter == 0x1FF) && (context->regs[REG_MODE_2] & DISPLAY_ENABLE);
+ active_slot = (context->vcounter < context->inactive_start || context->vcounter == 0x1FF) && (context->regs[REG_MODE_2] & DISPLAY_ENABLE);
} else {
- mode_5 = 0;
- inactive_start = MODE4_INACTIVE_START;
//display is effectively disabled if neither mode 5 nor mode 4 are selected
- active_slot = context->vcounter < inactive_start && (context->regs[REG_MODE_2] & DISPLAY_ENABLE) && (context->regs[REG_MODE_1] & BIT_MODE_4);
+ active_slot = context->vcounter < context->inactive_start && (context->regs[REG_MODE_2] & DISPLAY_ENABLE) && (context->regs[REG_MODE_1] & BIT_MODE_4);
}
if (active_slot) {
@@ -2097,7 +2165,7 @@ void vdp_run_context(vdp_context * context, uint32_t target_cycles)
context->sprite_draws = MAX_DRAWS_H32_MODE4;
}
}
- if(context->vcounter == inactive_start) {
+ if(context->vcounter == context->inactive_start) {
uint32_t intslot = context->regs[REG_MODE_4] & BIT_H40 ? VINT_SLOT_H40 : VINT_SLOT_H32;
if (context->hslot == intslot) {
context->flags2 |= FLAG2_VINT_PENDING;
@@ -2119,7 +2187,7 @@ void vdp_run_context(vdp_context * context, uint32_t target_cycles)
if (!is_refresh(context, context->hslot)) {
external_slot(context);
}
- if (context->vcounter < inactive_start) {
+ if (context->vcounter < (context->inactive_start + context->border_bot) || context->vcounter > 0x200 - context->border_top) {
check_render_bg(context, context->vcounter, context->hslot);
}
if (context->flags & FLAG_DMA_RUN && !is_refresh(context, context->hslot)) {
@@ -2130,18 +2198,12 @@ void vdp_run_context(vdp_context * context, uint32_t target_cycles)
if (is_h40) {
if (context->hslot == LINE_CHANGE_H40) {
vdp_advance_line(context);
- if (context->vcounter == (inactive_start + 8)) {
- context->frame++;
- }
} else if (context->hslot == 183) {
context->hslot = 229;
}
} else {
if (context->hslot == (mode_5 ? LINE_CHANGE_H32 : LINE_CHANGE_MODE4)) {
vdp_advance_line(context);
- if (context->vcounter == (inactive_start + 8)) {
- context->frame++;
- }
} else if (context->hslot == 148) {
context->hslot = 233;
}
@@ -2152,8 +2214,10 @@ void vdp_run_context(vdp_context * context, uint32_t target_cycles)
uint32_t vdp_run_to_vblank(vdp_context * context)
{
- uint32_t target_cycles = ((context->latched_mode & BIT_PAL) ? PAL_INACTIVE_START : NTSC_INACTIVE_START) * MCLKS_LINE;
- vdp_run_context(context, target_cycles);
+ uint32_t old_frame = context->frame;
+ while (context->frame == old_frame) {
+ vdp_run_context(context, MCLKS_LINE);
+ }
return context->cycles;
}
@@ -2275,6 +2339,9 @@ int vdp_control_port_write(vdp_context * context, uint16_t value)
context->flags2 &= ~FLAG2_EVEN_FIELD;
}
}
+ if (reg == REG_MODE_2) {
+ update_video_params(context);
+ }
}
} else if (mode_5) {
context->flags |= FLAG_PENDING;
@@ -2412,11 +2479,7 @@ uint16_t vdp_control_port_read(vdp_context * context)
}
uint32_t line= context->vcounter;
uint32_t slot = context->hslot;
- uint32_t inactive_start = (context->latched_mode & BIT_PAL ? PAL_INACTIVE_START : NTSC_INACTIVE_START);
- if (!(context->regs[REG_MODE_2] & BIT_MODE_5)) {
- inactive_start = MODE4_INACTIVE_START;
- }
- if ((line >= inactive_start && line < 0x1FF) || !(context->regs[REG_MODE_2] & BIT_DISP_EN)) {
+ if ((line >= context->inactive_start && line < 0x1FF) || !(context->regs[REG_MODE_2] & BIT_DISP_EN)) {
value |= 0x8;
}
if (context->regs[REG_MODE_4] & BIT_H40) {
@@ -2592,28 +2655,9 @@ static uint32_t vdp_cycles_to_line(vdp_context * context, uint32_t target)
return MCLKS_LINE * (lines - 1) + vdp_cycles_next_line(context);
}
-static uint32_t vdp_frame_end_line(vdp_context * context)
-{
- uint32_t frame_end;
- if (context->flags2 & FLAG2_REGION_PAL) {
- if (context->latched_mode & BIT_PAL) {
- frame_end = PAL_INACTIVE_START + 8;
- } else {
- frame_end = NTSC_INACTIVE_START + 8;
- }
- } else {
- if (context->latched_mode & BIT_PAL) {
- frame_end = 512;
- } else {
- frame_end = NTSC_INACTIVE_START + 8;
- }
- }
- return frame_end;
-}
-
uint32_t vdp_cycles_to_frame_end(vdp_context * context)
{
- return context->cycles + vdp_cycles_to_line(context, vdp_frame_end_line(context));
+ return context->cycles + vdp_cycles_to_line(context, context->inactive_start);
}
uint32_t vdp_next_hint(vdp_context * context)
@@ -2624,12 +2668,9 @@ uint32_t vdp_next_hint(vdp_context * context)
if (context->flags2 & FLAG2_HINT_PENDING) {
return context->pending_hint_start;
}
- uint32_t inactive_start = (context->regs[REG_MODE_2] & BIT_MODE_5)
- ? (context->latched_mode & BIT_PAL ? PAL_INACTIVE_START : NTSC_INACTIVE_START)
- : MODE4_INACTIVE_START;
uint32_t hint_line;
- if (context->vcounter + context->hint_counter >= inactive_start) {
- if (context->regs[REG_HINT] > inactive_start) {
+ if (context->vcounter + context->hint_counter >= context->inactive_start) {
+ if (context->regs[REG_HINT] > context->inactive_start) {
return 0xFFFFFFFF;
}
hint_line = context->regs[REG_HINT];
@@ -2655,11 +2696,7 @@ uint32_t vdp_next_vint(vdp_context * context)
uint32_t vdp_next_vint_z80(vdp_context * context)
{
- uint32_t inactive_start = context->latched_mode & BIT_PAL ? PAL_INACTIVE_START : NTSC_INACTIVE_START;
- if (!(context->regs[REG_MODE_2] & BIT_MODE_5)) {
- inactive_start = MODE4_INACTIVE_START;
- }
- if (context->vcounter == inactive_start) {
+ if (context->vcounter == context->inactive_start) {
if (context->regs[REG_MODE_2] & BIT_MODE_5) {
if (context->regs[REG_MODE_4] & BIT_H40) {
if (context->hslot >= LINE_CHANGE_H40 && context->hslot <= VINT_SLOT_H40) {
@@ -2696,7 +2733,7 @@ uint32_t vdp_next_vint_z80(vdp_context * context)
}
}
}
- int32_t cycles_to_vint = vdp_cycles_to_line(context, inactive_start);
+ int32_t cycles_to_vint = vdp_cycles_to_line(context, context->inactive_start);
if (context->regs[REG_MODE_2] & BIT_MODE_5) {
if (context->regs[REG_MODE_4] & BIT_H40) {
cycles_to_vint += MCLKS_LINE - (LINE_CHANGE_H40 + (256 - VINT_SLOT_H40)) * MCLKS_SLOT_H40;
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-19 16:15:27 +0000