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Advances emulation to showing what looks like appropriate text on screen.

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Thomas Harte 2017-11-28 21:27:15 -05:00
parent 563aa051e4
commit ecd7d4731b
1 changed files with 13 additions and 7 deletions
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20
Components/9918/9918.cpp
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@ -92,15 +92,21 @@ void TMS9918::run_for(const HalfCycles cycles) {
if(access_pointer_ >= 26) {
int end = std::min(154, column_);
// TODO: optimise this, probably
// TODO: optimise this mess.
const int row_base = ((row_ << 2)&~31);
while(access_pointer_ < end) {
int character_column = ((access_pointer_ - 26) >> 2);
switch(access_pointer_&3) {
case 0: pattern_name_ = ram_[pattern_name_address_ + row_base + character_column]; break;
case 0:
pattern_name_ = ram_[pattern_name_address_ + row_base + character_column];
break;
case 1: break; // TODO: sprites / CPU access.
case 2: colour_buffer_[character_column] = ram_[colour_table_address_ + (pattern_name_ >> 3)]; break;
case 3: pattern_buffer_[character_column] = ram_[pattern_generator_table_address_ + (pattern_name_ << 3) + (row_ & 7)]; break;
case 2:
colour_buffer_[character_column] = ram_[colour_table_address_ + (pattern_name_ >> 3)];
break;
case 3:
pattern_buffer_[character_column] = ram_[pattern_generator_table_address_ + (pattern_name_ << 3) + (row_ & 7)];
break;
}
access_pointer_++;
}
@ -135,11 +141,11 @@ void TMS9918::run_for(const HalfCycles cycles) {
while(output_column_ < pixels_end) {
int base = (output_column_ - first_pixel_column_);
int address = base >> 3;
// uint8_t colour = line_buffer_[address];
uint8_t colour = colour_buffer_[address];
uint8_t pattern = pattern_buffer_[address];
pattern >>= ((base&3)*2) + (output_column_ & 1);
pattern >>= ((base&7)^7);
*pixel_target_ = (pattern&1) ? 0xffffff : 0x000000;
*pixel_target_ = (pattern&1) ? palette[colour >> 4] : palette[colour & 15];
pixel_target_ ++;
output_column_ ++;
}