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Minor further style improvements.

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... as I refamiliarise myself.
This commit is contained in:
Thomas Harte 2022-12-29 22:09:14 -05:00
parent 5d89293c92
commit 8d5547dc9e
1 changed files with 26 additions and 32 deletions
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58
Components/9918/9918.cpp
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@ -86,6 +86,18 @@ struct ReverseTable {
constexpr ReverseTable reverse_table;
constexpr size_t memory_size(Personality p) {
switch(p) {
case TI::TMS::TMS9918A:
case TI::TMS::SMSVDP:
case TI::TMS::SMS2VDP:
case TI::TMS::GGVDP: return 16 * 1024;
case TI::TMS::MDVDP: return 64 * 1024;
case TI::TMS::V9938: return 128 * 1024;
case TI::TMS::V9958: return 192 * 1024;
}
}
}
Base::Base(Personality p) :
@ -94,24 +106,7 @@ Base::Base(Personality p) :
// Unimaginatively, this class just passes RGB through to the shader. Investigation is needed
// into whether there's a more natural form. It feels unlikely given the diversity of chips modelled.
switch(p) {
case TI::TMS::TMS9918A:
case TI::TMS::SMSVDP:
case TI::TMS::SMS2VDP:
case TI::TMS::GGVDP:
ram_.resize(16 * 1024);
break;
case TI::TMS::MDVDP:
ram_.resize(64 * 1024);
break;
case TI::TMS::V9938:
ram_.resize(128 * 1024);
break;
case TI::TMS::V9958:
ram_.resize(192 * 1024);
break;
}
ram_.resize(memory_size(p));
if(is_sega_vdp(personality_)) {
mode_timing_.line_interrupt_position = 64;
@ -188,8 +183,7 @@ void Base::posit_sprite(LineBuffer &buffer, int sprite_number, int sprite_positi
if(!(status_ & StatusSpriteOverflow)) {
status_ = uint8_t((status_ & ~0x1f) | (sprite_number & 0x1f));
}
if(buffer.sprites_stopped)
return;
if(buffer.sprites_stopped) return;
// A sprite Y of 208 means "don't scan the list any further".
if(mode_timing_.allow_sprite_terminator && sprite_position == mode_timing_.sprite_terminator) {
@ -595,23 +589,23 @@ void TMS9918::write(int address, uint8_t value) {
switch(value) {
case 0:
if(is_sega_vdp(personality_)) {
master_system_.vertical_scroll_lock = !!(low_write_ & 0x80);
master_system_.horizontal_scroll_lock = !!(low_write_ & 0x40);
master_system_.hide_left_column = !!(low_write_ & 0x20);
enable_line_interrupts_ = !!(low_write_ & 0x10);
master_system_.shift_sprites_8px_left = !!(low_write_ & 0x08);
master_system_.mode4_enable = !!(low_write_ & 0x04);
master_system_.vertical_scroll_lock = low_write_ & 0x80;
master_system_.horizontal_scroll_lock = low_write_ & 0x40;
master_system_.hide_left_column = low_write_ & 0x20;
enable_line_interrupts_ = low_write_ & 0x10;
master_system_.shift_sprites_8px_left = low_write_ & 0x08;
master_system_.mode4_enable = low_write_ & 0x04;
}
mode2_enable_ = !!(low_write_ & 0x02);
mode2_enable_ = low_write_ & 0x02;
break;
case 1:
blank_display_ = !(low_write_ & 0x40);
generate_interrupts_ = !!(low_write_ & 0x20);
mode1_enable_ = !!(low_write_ & 0x10);
mode3_enable_ = !!(low_write_ & 0x08);
sprites_16x16_ = !!(low_write_ & 0x02);
sprites_magnified_ = !!(low_write_ & 0x01);
generate_interrupts_ = low_write_ & 0x20;
mode1_enable_ = low_write_ & 0x10;
mode3_enable_ = low_write_ & 0x08;
sprites_16x16_ = low_write_ & 0x02;
sprites_magnified_ = low_write_ & 0x01;
sprite_height_ = 8;
if(sprites_16x16_) sprite_height_ <<= 1;