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Corrects sprite accumulation.

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This commit is contained in:
Thomas Harte 2018-10-14 19:56:09 -04:00
parent d66979c68f
commit c1e6406fc9
1 changed files with 4 additions and 3 deletions
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7
Components/9918/Implementation/9918Base.hpp
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@ -640,8 +640,8 @@ class Base {
#define sprite_y_read(location, sprite) \
slot(location): \
posit_sprite(line_buffer, sprite, ram_[sprite_attribute_table_address_ & (sprite | 0x3f00)], write_pointer_.row); \
posit_sprite(line_buffer, sprite+1, ram_[sprite_attribute_table_address_ & ((sprite + 1) | 0x3f00)], write_pointer_.row); \
posit_sprite(sprite_selection_buffer, sprite, ram_[sprite_attribute_table_address_ & (sprite | 0x3f00)], write_pointer_.row); \
posit_sprite(sprite_selection_buffer, sprite+1, ram_[sprite_attribute_table_address_ & ((sprite + 1) | 0x3f00)], write_pointer_.row); \
#define fetch_tile_name(column, row_info) {\
const size_t scrolled_column = (column - horizontal_offset) & 0x1f;\
@ -684,6 +684,7 @@ class Base {
// Determine the coarse horizontal scrolling offset; this isn't applied on the first two lines if the programmer has requested it.
LineBuffer &line_buffer = line_buffers_[write_pointer_.row];
LineBuffer &sprite_selection_buffer = line_buffers_[(write_pointer_.row + 1) % mode_timing_.total_lines];
const int horizontal_offset = (write_pointer_.row >= 16 || !master_system_.horizontal_scroll_lock) ? (line_buffer.latched_horizontal_scroll >> 3) : 0;
// Determine row info for the screen both (i) if vertical scrolling is applied; and (ii) if it isn't.
@ -718,7 +719,7 @@ class Base {
sprite_fetch_block(23, 6);
slot(29):
line_buffer.reset_sprite_collection();
sprite_selection_buffer.reset_sprite_collection();
do_external_slot();
external_slot(30);