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The Electron's video is now a ClockReceiver.

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This commit is contained in:
Thomas Harte 2017-07-24 22:36:42 -04:00
parent df4732be2e
commit a6e377aa57
3 changed files with 9 additions and 7 deletions
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2
Machines/Electron/Electron.cpp
View File

@ -353,7 +353,7 @@ void Machine::flush() {
inline void Machine::update_display() {
if(cycles_since_display_update_) {
video_output_->run_for_cycles((int)cycles_since_display_update_);
video_output_->run_for(Cycles((int)cycles_since_display_update_));
cycles_since_display_update_ = 0;
}
}

3
Machines/Electron/Video.cpp
View File

@ -223,7 +223,8 @@ void VideoOutput::output_pixels(unsigned int number_of_cycles) {
}
}
void VideoOutput::run_for_cycles(int number_of_cycles) {
void VideoOutput::run_for(const Cycles &cycles) {
int number_of_cycles = cycles.as_int();
output_position_ = (output_position_ + number_of_cycles) % cycles_per_frame;
while(number_of_cycles) {
int draw_action_length = screen_map_[screen_map_pointer_].length;

11
Machines/Electron/Video.hpp
View File

@ -10,6 +10,7 @@
#define Machines_Electron_Video_hpp
#include "../../Outputs/CRT/CRT.hpp"
#include "../../Components/ClockReceiver.hpp"
#include "Interrupts.hpp"
namespace Electron {
@ -21,7 +22,7 @@ namespace Electron {
running either at 40 or 80 columns. Memory is shared between video and CPU; when the video
is accessing it the CPU may not.
*/
class VideoOutput {
class VideoOutput: public ClockReceiver<VideoOutput> {
public:
/*!
Instantiates a VideoOutput that will read its pixels from @c memory. The pointer supplied
@ -32,8 +33,8 @@ class VideoOutput {
/// @returns the CRT to which output is being painted.
std::shared_ptr<Outputs::CRT::CRT> get_crt();
/// Produces the next @c number_of_cycles cycles of video output.
void run_for_cycles(int number_of_cycles);
/// Produces the next @c cycles of video output.
void run_for(const Cycles &cycles);
/*!
Writes @c value to the register at @c address. May mutate the results of @c get_next_interrupt,
@ -53,14 +54,14 @@ class VideoOutput {
/*!
@returns the next interrupt that should be generated as a result of the video hardware.
The time until signalling returned is the number of cycles after the final one triggered
by the most recent call to @c run_for_cycles.
by the most recent call to @c run_for.
This result may be mutated by calls to @c set_register.
*/
Interrupt get_next_interrupt();
/*!
@returns the number of cycles after (final cycle of last run_for_cycles batch + @c from_time)
@returns the number of cycles after (final cycle of last run_for batch + @c from_time)
before the video circuits will allow the CPU to access RAM.
*/
unsigned int get_cycles_until_next_ram_availability(int from_time);