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Step one towards cutting much of this cost: build only the table that's appropriate for the current mode, and at least declare when a more minimal change would be sufficient.

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This commit is contained in:
Thomas Harte 2017-08-19 22:19:46 -04:00
parent 669e0caff5
commit 57c5b38a6d
1 changed files with 50 additions and 29 deletions
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79
Machines/AmstradCPC/AmstradCPC.cpp
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@ -159,7 +159,7 @@ class CRTCBusHandler {
mode_(2),
next_mode_(2),
cycles_into_hsync_(0) {
build_mode_tables();
build_mode_table();
}
/*!
@ -271,6 +271,7 @@ class CRTCBusHandler {
case 1: pixel_divider_ = 2; break;
case 2: pixel_divider_ = 1; break;
}
build_mode_table();
}
interrupt_timer_.signal_hsync();
@ -339,8 +340,7 @@ class CRTCBusHandler {
border_ = mapped_palette_value(colour);
} else {
palette_[pen_] = mapped_palette_value(colour);
// TODO: no need for a full regeneration, of every mode, every time
build_mode_tables();
patch_mode_table(pen_);
}
}
@ -351,35 +351,56 @@ class CRTCBusHandler {
crt_->output_level(length * 16);
}
void build_mode_tables() {
for(int c = 0; c < 256; c++) {
// prepare mode 0
uint8_t *mode0_pixels = (uint8_t *)&mode0_output_[c];
mode0_pixels[0] = palette_[((c & 0x80) >> 7) | ((c & 0x20) >> 3) | ((c & 0x08) >> 2) | ((c & 0x02) << 2)];
mode0_pixels[1] = palette_[((c & 0x40) >> 6) | ((c & 0x10) >> 2) | ((c & 0x04) >> 1) | ((c & 0x01) << 3)];
void patch_mode_table(int pen) {
// TODO: patch, don't rebuild.
build_mode_table();
}
// prepare mode 1
uint8_t *mode1_pixels = (uint8_t *)&mode1_output_[c];
mode1_pixels[0] = palette_[((c & 0x80) >> 7) | ((c & 0x08) >> 2)];
mode1_pixels[1] = palette_[((c & 0x40) >> 6) | ((c & 0x04) >> 1)];
mode1_pixels[2] = palette_[((c & 0x20) >> 5) | ((c & 0x02) >> 0)];
mode1_pixels[3] = palette_[((c & 0x10) >> 4) | ((c & 0x01) << 1)];
void build_mode_table() {
switch(mode_) {
case 0:
for(int c = 0; c < 256; c++) {
// prepare mode 0
uint8_t *mode0_pixels = (uint8_t *)&mode0_output_[c];
mode0_pixels[0] = palette_[((c & 0x80) >> 7) | ((c & 0x20) >> 3) | ((c & 0x08) >> 2) | ((c & 0x02) << 2)];
mode0_pixels[1] = palette_[((c & 0x40) >> 6) | ((c & 0x10) >> 2) | ((c & 0x04) >> 1) | ((c & 0x01) << 3)];
}
break;
// prepare mode 2
uint8_t *mode2_pixels = (uint8_t *)&mode2_output_[c];
mode2_pixels[0] = palette_[((c & 0x80) >> 7)];
mode2_pixels[1] = palette_[((c & 0x40) >> 6)];
mode2_pixels[2] = palette_[((c & 0x20) >> 5)];
mode2_pixels[3] = palette_[((c & 0x10) >> 4)];
mode2_pixels[4] = palette_[((c & 0x08) >> 3)];
mode2_pixels[5] = palette_[((c & 0x04) >> 2)];
mode2_pixels[6] = palette_[((c & 0x03) >> 1)];
mode2_pixels[7] = palette_[((c & 0x01) >> 0)];
case 1:
for(int c = 0; c < 256; c++) {
// prepare mode 1
uint8_t *mode1_pixels = (uint8_t *)&mode1_output_[c];
mode1_pixels[0] = palette_[((c & 0x80) >> 7) | ((c & 0x08) >> 2)];
mode1_pixels[1] = palette_[((c & 0x40) >> 6) | ((c & 0x04) >> 1)];
mode1_pixels[2] = palette_[((c & 0x20) >> 5) | ((c & 0x02) >> 0)];
mode1_pixels[3] = palette_[((c & 0x10) >> 4) | ((c & 0x01) << 1)];
}
break;
// prepare mode 3
uint8_t *mode3_pixels = (uint8_t *)&mode3_output_[c];
mode3_pixels[0] = palette_[((c & 0x80) >> 7) | ((c & 0x08) >> 2)];
mode3_pixels[1] = palette_[((c & 0x40) >> 6) | ((c & 0x04) >> 1)];
case 2:
for(int c = 0; c < 256; c++) {
// prepare mode 2
uint8_t *mode2_pixels = (uint8_t *)&mode2_output_[c];
mode2_pixels[0] = palette_[((c & 0x80) >> 7)];
mode2_pixels[1] = palette_[((c & 0x40) >> 6)];
mode2_pixels[2] = palette_[((c & 0x20) >> 5)];
mode2_pixels[3] = palette_[((c & 0x10) >> 4)];
mode2_pixels[4] = palette_[((c & 0x08) >> 3)];
mode2_pixels[5] = palette_[((c & 0x04) >> 2)];
mode2_pixels[6] = palette_[((c & 0x03) >> 1)];
mode2_pixels[7] = palette_[((c & 0x01) >> 0)];
}
break;
case 3:
for(int c = 0; c < 256; c++) {
// prepare mode 3
uint8_t *mode3_pixels = (uint8_t *)&mode3_output_[c];
mode3_pixels[0] = palette_[((c & 0x80) >> 7) | ((c & 0x08) >> 2)];
mode3_pixels[1] = palette_[((c & 0x40) >> 6) | ((c & 0x04) >> 1)];
}
break;
}
}