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Attempted to ensure a clean startup.

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This commit is contained in:
Thomas Harte 2017-08-01 22:18:42 -04:00
parent 587eb3a67c
commit 4d5d5041df
1 changed files with 38 additions and 31 deletions
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69
Machines/AmstradCPC/AmstradCPC.cpp
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@ -73,7 +73,11 @@ class CRTCBusHandler {
was_hsync_(false),
ram_(ram),
interrupt_timer_(interrupt_timer),
pixel_divider_(1) {}
pixel_divider_(1),
mode_(2),
next_mode_(2) {
build_mode_tables();
}
inline void perform_bus_cycle(const Motorola::CRTC::BusState &state) {
bool is_sync = state.hsync || state.vsync;
@ -214,41 +218,44 @@ class CRTCBusHandler {
// TODO: should flush any border currently in progress
} else {
palette_[pen_] = mapped_palette_value(colour);
// TODO: no need for a full regeneration, of every mode, every time
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)];
// 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)];
// 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)];
// 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)];
}
build_mode_tables();
}
}
private:
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)];
// 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)];
// 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)];
// 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)];
}
}
uint8_t mapped_palette_value(uint8_t colour) {
#define COL(r, g, b) (r << 4) | (g << 2) | b
static const uint8_t mapping[32] = {