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Got to outputting something to the CRT. Should be just proper syncs and a paper background. It's not synchronising properly, so something is amiss in my timing.

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This commit is contained in:
Thomas Harte 2017-06-05 10:47:42 -04:00
parent 23ca00fd9a
commit 4983718df7
2 changed files with 33 additions and 4 deletions
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31
Machines/ZX8081/ZX8081.cpp
View File

@ -15,7 +15,8 @@ using namespace ZX8081;
Machine::Machine() :
vsync_(false),
hsync_(false),
ram_(1024) {
ram_(1024),
line_data_(nullptr) {
// run at 3.25 Mhz
set_clock_rate(3250000);
Memory::Fuzz(ram_);
@ -114,19 +115,43 @@ void Machine::set_rom(ROMType type, std::vector<uint8_t> data) {
#pragma mark - Video
void Machine::update_display() {
// TODO.
cycles_since_display_update_ = 0;
// cycles_since_display_update_ = 0;
}
void Machine::set_vsync(bool sync) {
if(sync == vsync_) return;
vsync_ = sync;
update_sync();
}
void Machine::set_hsync(bool sync) {
if(sync == hsync_) return;
hsync_ = sync;
update_sync();
}
void Machine::update_sync() {
bool is_sync = hsync_ || vsync_;
if(is_sync == is_sync_) return;
if(is_sync_) {
crt_->output_sync(cycles_since_display_update_);
} else {
output_level(cycles_since_display_update_);
}
cycles_since_display_update_ = 0;
is_sync_ = is_sync;
}
void Machine::output_level(unsigned int number_of_cycles) {
uint8_t *colour_pointer = (uint8_t *)crt_->allocate_write_area(1);
if(colour_pointer) *colour_pointer = 0;
crt_->output_level(number_of_cycles);
}
void Machine::output_byte(uint8_t byte) {
if(!line_data_) {
}
// printf("%d\n", cycles_since_display_update_);
// cycles_since_display_update_ = 0;
}

6
Machines/ZX8081/ZX8081.hpp
View File

@ -51,11 +51,15 @@ class Machine:
std::vector<uint8_t> ram_;
bool vsync_, hsync_;
bool is_sync_;
uint8_t *line_data_;
int cycles_since_display_update_;
unsigned int cycles_since_display_update_;
void update_display();
void set_vsync(bool sync);
void set_hsync(bool sync);
void update_sync();
void output_level(unsigned int number_of_cycles);
void output_byte(uint8_t byte);
};