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Ensured an actual pixel stream is supplied for pixel regions. Though it's just a long stream of white pixels for now. So visual output is unchanged.

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This commit is contained in:
Thomas Harte 2017-08-01 07:24:29 -04:00
parent 9d953421d8
commit 3ae699964f
1 changed files with 30 additions and 6 deletions
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36
Machines/AmstradCPC/AmstradCPC.cpp
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@ -16,18 +16,41 @@ using namespace AmstradCPC;
struct CRTCBusHandler {
public:
CRTCBusHandler() : cycles_(0), was_enabled_(false), was_sync_(false) {}
CRTCBusHandler() : cycles_(0), was_enabled_(false), was_sync_(false), pixel_data_(nullptr), pixel_pointer_(nullptr) {}
inline void perform_bus_cycle(const Motorola::CRTC::BusState &state) {
cycles_++;
bool is_sync = state.hsync || state.vsync;
// collect some more pixels if output is ongoing
if(!is_sync && state.display_enable) {
if(!pixel_data_) {
pixel_pointer_ = pixel_data_ = crt_->allocate_write_area(320);
}
if(pixel_pointer_) {
*pixel_pointer_++ = 0xff;
// flush the current buffer if full
if(pixel_pointer_ == pixel_data_ + 320) {
crt_->output_data(320, 16);
pixel_pointer_ = pixel_data_ = nullptr;
}
}
}
// if a transition between sync/border/pixels just occurred, announce it
if(state.display_enable != was_enabled_ || is_sync != was_sync_) {
if(was_sync_) {
crt_->output_sync((unsigned int)(cycles_ * 2) * 8);
crt_->output_sync((unsigned int)(cycles_ * 16));
} else {
uint8_t *colour_pointer = (uint8_t *)crt_->allocate_write_area(1);
if(colour_pointer) *colour_pointer = was_enabled_ ? 0xff : 0x00;
crt_->output_level((unsigned int)(cycles_ * 2) * 8);
if(was_enabled_) {
crt_->output_data((unsigned int)(cycles_ * 16), 16);
pixel_pointer_ = pixel_data_ = nullptr;
} else {
uint8_t *colour_pointer = (uint8_t *)crt_->allocate_write_area(1);
if(colour_pointer) *colour_pointer = 0x00;
crt_->output_level((unsigned int)(cycles_ * 16));
}
}
cycles_ = 0;
@ -37,7 +60,7 @@ struct CRTCBusHandler {
}
void setup_output(float aspect_ratio) {
crt_.reset(new Outputs::CRT::CRT(1024, 8, Outputs::CRT::DisplayType::PAL50, 1));
crt_.reset(new Outputs::CRT::CRT(1024, 16, Outputs::CRT::DisplayType::PAL50, 1));
crt_->set_rgb_sampling_function(
"vec3 rgb_sample(usampler2D sampler, vec2 coordinate, vec2 icoordinate)"
"{"
@ -57,6 +80,7 @@ struct CRTCBusHandler {
int cycles_;
bool was_enabled_, was_sync_;
std::shared_ptr<Outputs::CRT::CRT> crt_;
uint8_t *pixel_data_, *pixel_pointer_;
};
class ConcreteMachine: