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Makes first attempt to put something vaguely like the Master System tile map on screen.

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This commit is contained in:
Thomas Harte 2018-09-28 20:39:14 -04:00
parent 43bcb6415b
commit f7e211c245
2 changed files with 67 additions and 21 deletions
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30
Components/9918/9918.cpp
View File

@ -211,6 +211,9 @@ void TMS9918::run_for(const HalfCycles cycles) {
if(queued_access_ != MemoryAccess::None) {
int time_until_access_slot = 0;
switch(line_mode_) {
case LineMode::SMS:
time_until_access_slot = 0; // TODO.
break;
case LineMode::Refresh:
if(column_ < 53 || column_ >= 307) time_until_access_slot = column_&1;
else time_until_access_slot = 3 - ((column_ - 53)&3);
@ -271,7 +274,7 @@ void TMS9918::run_for(const HalfCycles cycles) {
case LineMode::Text:
access_pointer_ = std::min(30, access_slot);
if(access_pointer_ >= 30 && access_pointer_ < 150) {
const int row_base = pattern_name_address_ + static_cast<size_t>(row_ >> 3) * 40;
const size_t row_base = pattern_name_address_ + static_cast<size_t>(row_ >> 3) * 40;
const int end = std::min(150, access_slot);
// Pattern names are collected every third window starting from window 30.
@ -430,6 +433,20 @@ void TMS9918::run_for(const HalfCycles cycles) {
switch(line_mode_) {
default: break;
case LineMode::SMS: {
if(pixel_target_) {
const int pixels_left = pixels_end - output_column_;
int pixel_location = output_column_ - first_pixel_column_;
for(int c = 0; c < pixels_left; ++c) {
pixel_target_[c] = *(uint32_t *)master_system_.tile_graphics[pixel_location >> 8];
}
pixel_target_ += pixels_left;
}
output_column_ = pixels_end;
}
break;
case LineMode::Text: {
if(pixel_target_) {
const uint32_t colours[2] = { palette[background_colour_], palette[text_colour_] };
@ -629,6 +646,9 @@ void TMS9918::run_for(const HalfCycles cycles) {
break;
case ScreenMode::SMSMode4:
line_mode_ = LineMode::SMS;
master_system_.next_column = 0;
first_pixel_column_ = 63;
first_right_border_column_ = 319;
break;
default:
line_mode_ = LineMode::Character;
@ -672,10 +692,14 @@ void TMS9918::set_register(int address, uint8_t value) {
if(value & 0x80) {
switch(personality_) {
default:
value &= 7;
value &= 0x7;
break;
case TI::TMS::SMSVDP:
value &= 0x7f;
if(value & 0x40) {
// TODO: CRAM.
return;
}
value &= 0xf;
break;
}

58
Components/9918/Implementation/9918Base.hpp
View File

@ -118,7 +118,14 @@ class Base {
bool shift_sprites_8px_left = false;
bool mode4_enable = false;
uint8_t colour_ram_[32];
uint8_t colour_ram[32];
struct {
size_t offset;
uint8_t flags;
} names[32];
uint8_t tile_graphics[32][4];
size_t next_column = 0;
} master_system_;
enum class ScreenMode {
@ -208,23 +215,36 @@ class Base {
- sprite n and n+1, y position
*/
#define background_render_block(location) \
slot(location): \
#define fetch_tile_name(column) {\
size_t address = pattern_address_base + ((column) << 1); \
master_system_.names[column].flags = ram_[address+1]; \
master_system_.names[column].offset = static_cast<size_t>((master_system_.names[column].flags&1 | ram_[address]) << 5) + sub_row; \
}
#define fetch_tile(column) {\
master_system_.tile_graphics[column][0] = ram_[master_system_.names[column].offset]; \
master_system_.tile_graphics[column][1] = ram_[master_system_.names[column].offset+1]; \
master_system_.tile_graphics[column][2] = ram_[master_system_.names[column].offset+2]; \
master_system_.tile_graphics[column][3] = ram_[master_system_.names[column].offset+3]; \
}
#define background_render_block(location, column) \
slot(location): fetch_tile_name(column) \
external_slot(location+1); \
slot(location+2): \
slot(location+3): \
slot(location+4): \
slot(location+3): fetch_tile(column) \
slot(location+4): fetch_tile_name(column+1) \
sprite_y_read(location+5); \
slot(location+6): \
slot(location+7): \
slot(location+8): \
slot(location+7): fetch_tile(column+1) \
slot(location+8): fetch_tile_name(column+2) \
sprite_y_read(location+9); \
slot(location+10): \
slot(location+11): \
slot(location+12): \
slot(location+11): fetch_tile(column+2) \
slot(location+12): fetch_tile_name(column+3) \
sprite_y_read(location+13); \
slot(location+14): \
slot(location+15):
slot(location+15): fetch_tile(column+3)
/*
TODO: background_render_block should fetch:
@ -245,6 +265,8 @@ class Base {
- column n+3, tile graphic first word
- column n+3, tile graphic second word
*/
const size_t pattern_address_base = (pattern_name_address_ | size_t(0x3ff)) & static_cast<size_t>(((row_ & ~7) << 6) | 0x3800);
const size_t sub_row = static_cast<size_t>((row_ & 7) << 2);
switch(start) {
default:
@ -267,14 +289,14 @@ class Base {
sprite_y_read(36);
sprite_y_read(37);
sprite_y_read(38);
background_render_block(39);
background_render_block(55);
background_render_block(71);
background_render_block(87);
background_render_block(103);
background_render_block(119);
background_render_block(135);
background_render_block(151);
background_render_block(39, 0);
background_render_block(55, 4);
background_render_block(71, 8);
background_render_block(87, 12);
background_render_block(103, 16);
background_render_block(119, 20);
background_render_block(135, 24);
background_render_block(151, 28);
external_slot(167);
external_slot(168);
external_slot(169);