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If I'm going to push only a single colour, might as well make it fast.

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This commit is contained in:
Thomas Harte 2021-07-26 21:19:43 -04:00
parent a43175125a
commit d8f814f1c4
1 changed files with 19 additions and 6 deletions
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25
Machines/Amiga/Chipset.cpp
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@ -45,8 +45,12 @@ Chipset::Chipset(uint16_t *ram, size_t size) :
Chipset::Changes Chipset::run_for(HalfCycles length, bool) {
Changes changes;
// Update raster position, spooling out something that isn't yet actual graphics.
auto pixels_remaining = length.as<int>();
// TODO: all DMA scheduling and actions, possibly stopping upon discovery of a CPU slot.
// Video memory collected here is spirited away for unspooling in the next loop.
// Update raster position, spooling out graphics.
while(pixels_remaining) {
// Determine number of pixels left on this line.
int line_pixels = std::min(pixels_remaining, line_length_ - x_);
@ -120,15 +124,24 @@ Chipset::Changes Chipset::run_for(HalfCycles length, bool) {
LINK(burst, output_default_colour_burst, burst - blank2); // TODO: only if colour enabled.
LINK(blank3, output_blank, blank3 - burst);
// Output generic white to fill the rest of the line.
if(final_x > blank3) {
const int start_x = std::max(blank3, x_);
// if(final_x > blank3) {
// const int start_x = std::max(blank3, x_);
//
// uint16_t *const pixels = reinterpret_cast<uint16_t *>(crt_.begin_data(2));
// if(pixels) {
// *pixels = palette_[0];
// }
// crt_.output_data((final_x - start_x) * 4, 1);
// }
uint16_t *const pixels = reinterpret_cast<uint16_t *>(crt_.begin_data(2));
// Output colour 0 to fill the rest of the line; Kickstart uses this
// colour to post the error code. TODO: actual pixels, etc.
if(final_x == line_length_) {
uint16_t *const pixels = reinterpret_cast<uint16_t *>(crt_.begin_data(1));
if(pixels) {
*pixels = palette_[0];
}
crt_.output_data((final_x - start_x) * 4, 1);
crt_.output_data((final_x - blank3) * 4, 1);
}
}