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315_5124.cpp minor fixes to previous changes

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This commit is contained in:
Enik Land 2018-08-18 16:54:19 -03:00
parent c07731b3d4
commit 456fd0e916
2 changed files with 57 additions and 56 deletions
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108
src/devices/video/315_5124.cpp
View File

@ -621,7 +621,7 @@ READ8_MEMBER( sega315_5124_device::data_read )
if ( !machine().side_effects_disabled() )
{
/* Load read buffer */
/* Load data buffer */
m_buffer = this->space().read_byte(m_addr & 0x3fff);
/* Bump internal address register */
@ -910,30 +910,35 @@ uint16_t sega315_5246_device::name_table_row_mode4(int row)
}
void sega315_5124_device::draw_column0_x_scroll_mode4(int *line_buffer, int *priority_selected, int x_scroll_fine_adjust, int palette_selected, int tile_line)
void sega315_5124_device::draw_leftmost_pixels_mode4(int *line_buffer, int *priority_selected, int fine_x_scroll, int palette_selected, int tile_line)
{
// To draw the leftmost column when it is incomplete on screen due to
// scrolling, Sega Master System has a weird behaviour to select which
// palette will be used to obtain the color in entry 0, that depends
// on the content of sprite 0.
// To draw the leftmost pixels when they aren't part of a tile column
// due to scrolling, Sega Master System has a weird behaviour to select
// which palette will be used to obtain the color in entry 0, that
// depends on the content of tile 0x100.
// This implementation mimics the behaviour of the Emulicious emulator,
// seen with the test ROM provided by sverx here:
//
// http://www.smspower.org/forums/15653-CommunityEffortRequestHelpDiscoverHowTheVDPHandlesTheLeftmostPixelsWhenScrolling
//
// From the sprite 0 tile, it uses bit 1 of the plane that would
// From the tile 0x100, it uses bit 1 of the plane that would
// select the color for the pixel 4 at the current line.
const int pixel_x = 4;
// The parsing seems to occur before the line counter is incremented
// to the number of the line to be drawn.
int parse_line = tile_line - 1;
// Locate the tile number for sprite 0.
const int sprite_tile_selected = select_sprite_tile_mode4(0, tile_line & 0x07);
// Select tile 0x100.
// Tried before with the number stored in m_sprite_tile_selected[0],
// but with it the expected behaviour only occurs with some BIOSes.
const int tile_selected = 0x100;
// Load data of bit plane 1 for the sprite tile.
const int tmp_bit_plane_1 = space().read_byte((sprite_tile_selected << 5) + ((tile_line & 0x07) << 2) + 0x01);
// Load data of bit plane 1 for the selected tile.
const int tmp_bit_plane_1 = space().read_byte((tile_selected << 5) + ((parse_line & 0x07) << 2) + 0x01);
const uint8_t pen_bit_1 = BIT(tmp_bit_plane_1, 7 - pixel_x);
for (int pixel_plot_x = 0; pixel_plot_x < x_scroll_fine_adjust; pixel_plot_x++)
for (int pixel_plot_x = 0; pixel_plot_x < fine_x_scroll; pixel_plot_x++)
{
line_buffer[pixel_plot_x] = m_current_palette[pen_bit_1 ? 0x10 : 0x00];
priority_selected[pixel_plot_x] = 0;
@ -941,13 +946,13 @@ void sega315_5124_device::draw_column0_x_scroll_mode4(int *line_buffer, int *pri
}
void sega315_5313_mode4_device::draw_column0_x_scroll_mode4(int *line_buffer, int *priority_selected, int x_scroll_fine_adjust, int palette_selected, int tile_line)
void sega315_5313_mode4_device::draw_leftmost_pixels_mode4(int *line_buffer, int *priority_selected, int fine_x_scroll, int palette_selected, int tile_line)
{
// To draw the leftmost column when it is incomplete on screen due to
// scrolling, Sega Genesis/Mega Drive seems to use entry #0 of the
// palette selected by the next background tile to be drawn on screen.
// To draw the leftmost pixels when they aren't part of a tile column
// due to scrolling, Sega Genesis/Mega Drive seems to use entry #0 of
// the palette selected by the next background tile to be drawn on screen.
for (int pixel_plot_x = 0; pixel_plot_x < x_scroll_fine_adjust; pixel_plot_x++)
for (int pixel_plot_x = 0; pixel_plot_x < fine_x_scroll; pixel_plot_x++)
{
line_buffer[pixel_plot_x] = m_current_palette[palette_selected ? 0x10 : 0x00];
priority_selected[pixel_plot_x] = 0;
@ -965,7 +970,7 @@ void sega315_5124_device::draw_scanline_mode4( int *line_buffer, int *priority_s
const int x_scroll = ((BIT(m_reg[0x00], 6) && (line < 16)) ? 0 : m_reg8copy);
const int x_scroll_start_column = 32 - (x_scroll >> 3); /* x starting column tile */
const int x_scroll_fine_adjust = (x_scroll & 0x07);
const int fine_x_scroll = (x_scroll & 0x07);
if ( m_y_pixels != 192 )
{
@ -1008,9 +1013,9 @@ void sega315_5124_device::draw_scanline_mode4( int *line_buffer, int *priority_s
/* Column 0 is the leftmost tile column that completely entered in the screen.
If the leftmost pixels aren't part of a complete tile, due to horizontal
scrolling, they are drawn only with color #0 of the selected palette. */
if (tile_column == 0 && x_scroll_fine_adjust > 0)
if (tile_column == 0 && fine_x_scroll > 0)
{
draw_column0_x_scroll_mode4(line_buffer, priority_selected, x_scroll_fine_adjust, palette_selected, tile_line);
draw_leftmost_pixels_mode4(line_buffer, priority_selected, fine_x_scroll, palette_selected, tile_line);
}
for (int pixel_x = 0; pixel_x < 8; pixel_x++)
@ -1036,7 +1041,7 @@ void sega315_5124_device::draw_scanline_mode4( int *line_buffer, int *priority_s
pixel_plot_x = 7 - pixel_x;
}
pixel_plot_x = x_scroll_fine_adjust + (tile_column << 3) + pixel_plot_x;
pixel_plot_x = fine_x_scroll + (tile_column << 3) + pixel_plot_x;
if (pixel_plot_x < 256)
{
line_buffer[pixel_plot_x] = m_current_palette[pen_selected];
@ -1071,31 +1076,6 @@ uint8_t sega315_5246_device::sprite_tile_mask_mode4(uint8_t tile_number)
}
int sega315_5124_device::select_sprite_tile_mode4(int sprite_index, int sprite_line)
{
int sprite_tile_selected = space().read_byte( sprite_attributes_addr_mode4(m_sprite_base + 0x81) + (sprite_index << 1) );
sprite_tile_selected = sprite_tile_mask_mode4(sprite_tile_selected);
if (BIT(m_reg[0x06], 2))
{
sprite_tile_selected += 256; /* pattern table select */
}
if (m_sprite_height == 16)
{
sprite_tile_selected &= 0x01fe; /* force even index */
}
if (sprite_line > 0x07)
{
sprite_tile_selected += 1;
}
return sprite_tile_selected;
}
void sega315_5124_device::sprite_count_overflow(int line, int sprite_index)
{
/* Overflow is flagged only on active display and when VINT isn't active */
@ -1154,7 +1134,7 @@ void sega315_5124_device::select_sprites( int line )
sprite_y -= 256; /* wrap from top if y position is >= 240 */
}
if (m_sprite_zoom_scale > 1 && m_sprite_count <= m_max_sprite_zoom_vcount)
if (m_sprite_zoom_scale > 1 && m_sprite_count < m_max_sprite_zoom_vcount)
{
/* Divide before use the value for comparison, or else an
off-by-one bug could occur, as seen with Tarzan, for Game Gear */
@ -1220,7 +1200,7 @@ void sega315_5124_device::select_sprites( int line )
sprite_y -= 256; /* wrap from top if y position is >= 240 */
}
if (m_sprite_zoom_scale > 1 && m_sprite_count <= m_max_sprite_zoom_vcount)
if (m_sprite_zoom_scale > 1 && m_sprite_count < m_max_sprite_zoom_vcount)
{
/* Divide before use the value for comparison, or else an
off-by-one bug could occur, as seen with Tarzan, for Game Gear */
@ -1233,14 +1213,31 @@ void sega315_5124_device::select_sprites( int line )
if (m_sprite_count < max_sprites)
{
const int sprite_line = parse_line - sprite_y;
const int sprite_tile_selected = select_sprite_tile_mode4(sprite_index, sprite_line);
int sprite_x = space().read_byte( sprite_attributes_addr_mode4(m_sprite_base + 0x80) + (sprite_index << 1) );
int sprite_tile_selected = space().read_byte( sprite_attributes_addr_mode4(m_sprite_base + 0x81) + (sprite_index << 1) );
sprite_tile_selected = sprite_tile_mask_mode4(sprite_tile_selected);
if (BIT(m_reg[0x00], 3))
{
sprite_x -= 0x08; /* sprite shift */
}
if (BIT(m_reg[0x06], 2))
{
sprite_tile_selected += 256; /* pattern table select */
}
if (m_sprite_height == 16)
{
sprite_tile_selected &= 0x01fe; /* force even index */
}
if (sprite_line > 0x07)
{
sprite_tile_selected += 1;
}
m_sprite_x[m_sprite_count] = sprite_x;
m_sprite_tile_selected[m_sprite_count] = sprite_tile_selected;
m_sprite_pattern_line[m_sprite_count] = ((sprite_line & 0x07) << 2);
@ -1309,8 +1306,13 @@ void sega315_5313_mode4_device::sprite_collision(int line, int sprite_col_x)
{
if (line >= 0 && line < m_frame_timing[ACTIVE_DISPLAY_V])
{
m_pending_status |= STATUS_SPRCOL;
m_pending_sprcol_x = m_line_timing[SPRCOL_BASEHPOS];
// This function is been used to check for sprite collision of
// the 315-5313 VDP, that occurs before the active screen is
// drawn, so it must not flag a collision again when drawing.
if (screen().hpos() < m_draw_time) {
m_pending_status |= STATUS_SPRCOL;
m_pending_sprcol_x = m_line_timing[SPRCOL_BASEHPOS];
}
}
}
@ -1332,7 +1334,7 @@ void sega315_5124_device::draw_sprites_mode4( int *line_buffer, int *priority_se
const int sprite_x = m_sprite_x[sprite_buffer_index];
const int sprite_tile_selected = m_sprite_tile_selected[sprite_buffer_index];
const uint16_t sprite_pattern_line = m_sprite_pattern_line[sprite_buffer_index];
const int zoom_scale = sprite_buffer_index <= m_max_sprite_zoom_hcount ? m_sprite_zoom_scale : 1;
const int zoom_scale = sprite_buffer_index < m_max_sprite_zoom_hcount ? m_sprite_zoom_scale : 1;
const uint8_t bit_plane_0 = space().read_byte((sprite_tile_selected << 5) + sprite_pattern_line + 0x00);
const uint8_t bit_plane_1 = space().read_byte((sprite_tile_selected << 5) + sprite_pattern_line + 0x01);
@ -1429,7 +1431,7 @@ void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int line
const uint16_t sprite_pattern_line = m_sprite_pattern_line[sprite_buffer_index];
const uint8_t flags = m_sprite_flags[sprite_buffer_index];
const int pen_selected = m_palette_offset + ( flags & 0x0f );
const int zoom_scale = sprite_buffer_index <= m_max_sprite_zoom_hcount ? m_sprite_zoom_scale : 1;
const int zoom_scale = sprite_buffer_index < m_max_sprite_zoom_hcount ? m_sprite_zoom_scale : 1;
if (BIT(flags, 7))
sprite_x -= 32;

5
src/devices/video/315_5124.h
View File

@ -107,11 +107,10 @@ protected:
virtual void sprite_count_overflow(int line, int sprite_index);
virtual void draw_scanline(int pixel_offset_x, int pixel_plot_y, int line);
virtual void blit_scanline(int *line_buffer, int *priority_selected, int pixel_offset_x, int pixel_plot_y, int line);
virtual void draw_column0_x_scroll_mode4(int *line_buffer, int *priority_selected, int x_scroll_fine_adjust, int palette_selected, int tile_line);
virtual void draw_leftmost_pixels_mode4(int *line_buffer, int *priority_selected, int fine_x_scroll, int palette_selected, int tile_line);
virtual uint16_t name_table_row_mode4(int row);
virtual uint16_t sprite_attributes_addr_mode4(uint16_t base);
virtual uint8_t sprite_tile_mask_mode4(uint8_t tile_number);
virtual int select_sprite_tile_mode4(int sprite_index, int sprite_line);
void process_line_timer();
void draw_scanline_mode4(int *line_buffer, int *priority_selected, int line);
void draw_sprites_mode4(int *line_buffer, int *priority_selected, int line);
@ -246,7 +245,7 @@ protected:
virtual void sprite_count_overflow(int line, int sprite_index) override;
virtual void select_display_mode() override;
virtual void select_extended_res_mode4(bool M1, bool M2, bool M3) override;
virtual void draw_column0_x_scroll_mode4(int *line_buffer, int *priority_selected, int x_scroll_fine_adjust, int palette_selected, int tile_line) override;
virtual void draw_leftmost_pixels_mode4(int *line_buffer, int *priority_selected, int fine_x_scroll, int palette_selected, int tile_line) override;
};