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Starts writing and referring to colour RAM for colours.

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This commit is contained in:
Thomas Harte 2018-09-29 19:50:13 -04:00
parent 0d8af010b6
commit 23191efc05
2 changed files with 27 additions and 12 deletions
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30
Components/9918/9918.cpp
View File

@ -442,14 +442,16 @@ void TMS9918::run_for(const HalfCycles cycles) {
const int column = (pixel_location + c) >> 3;
const int shift = 4 + (((pixel_location + c) & 7) ^ reverses[(master_system_.names[column].flags&2) >> 1]);
int value =
((
((master_system_.tile_graphics[column][0] << shift) & 0x800) |
((master_system_.tile_graphics[column][1] << (shift - 1)) & 0x400) |
((master_system_.tile_graphics[column][2] << (shift - 2)) & 0x200) |
((master_system_.tile_graphics[column][3] << (shift - 3)) & 0x100)
) >> 8) << 4;
(
(
((master_system_.tile_graphics[column][3] << shift) & 0x800) |
((master_system_.tile_graphics[column][2] << (shift - 1)) & 0x400) |
((master_system_.tile_graphics[column][1] << (shift - 2)) & 0x200) |
((master_system_.tile_graphics[column][0] << (shift - 3)) & 0x100)
) >> 8
) | ((master_system_.names[column].flags&0x08) << 1);
pixel_target_[c] = static_cast<uint32_t>((value << 24) | (value << 16) | (value << 8) | value);
pixel_target_[c] = master_system_.colour_ram[value];
}
pixel_target_ += pixels_left;
}
@ -684,9 +686,18 @@ void TMS9918::set_register(int address, uint8_t value) {
if(!(address & 1)) {
write_phase_ = false;
if(master_system_.cram_is_selected) {
master_system_.colour_ram[ram_pointer_ & 0x1f] = palette_pack(
static_cast<uint8_t>((value & 0x03) << 6),
static_cast<uint8_t>((value & 0x0c) << 4),
static_cast<uint8_t>((value & 0x30) << 2));
++ram_pointer_;
// TODO: insert a CRAM dot here.
} else {
// Enqueue the write to occur at the next available slot.
read_ahead_buffer_ = value;
queued_access_ = MemoryAccess::Write;
}
return;
}
@ -707,7 +718,9 @@ void TMS9918::set_register(int address, uint8_t value) {
break;
case TI::TMS::SMSVDP:
if(value & 0x40) {
// TODO: CRAM.
ram_pointer_ = static_cast<uint16_t>(low_write_ | (value << 8));
master_system_.cram_is_selected = true;
queued_access_ = MemoryAccess::None;
return;
}
value &= 0xf;
@ -787,6 +800,7 @@ void TMS9918::set_register(int address, uint8_t value) {
// Officially a 'read' set, so perform lookahead.
queued_access_ = MemoryAccess::Read;
}
master_system_.cram_is_selected = false;
}
}

3
Components/9918/Implementation/9918Base.hpp
View File

@ -118,7 +118,7 @@ class Base {
bool shift_sprites_8px_left = false;
bool mode4_enable = false;
uint8_t colour_ram[32];
uint32_t colour_ram[32];
struct {
size_t offset;
@ -129,6 +129,7 @@ class Base {
uint8_t horizontal_scroll = 0;
uint8_t vertical_scroll = 0;
bool cram_is_selected = false;
} master_system_;
enum class ScreenMode {