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Adjusts TMS declared timing so as to be in-phase with an NTSC clock, and adopts an alternative palette.

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This commit is contained in:
Thomas Harte 2017-12-09 22:28:34 -05:00
parent 943418c434
commit 042edc72f7
1 changed files with 23 additions and 23 deletions
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46
Components/9918/9918.cpp
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@ -28,29 +28,31 @@ const uint32_t palette_pack(uint8_t r, uint8_t g, uint8_t b) {
const uint32_t palette[16] = { const uint32_t palette[16] = {
palette_pack(0, 0, 0), palette_pack(0, 0, 0),
palette_pack(0, 0, 0), palette_pack(0, 0, 0),
palette_pack(90, 201, 81), palette_pack(33, 200, 66),
palette_pack(149, 231, 133), palette_pack(94, 220, 120),
palette_pack(113, 104, 183), palette_pack(84, 85, 237),
palette_pack(146, 132, 255), palette_pack(125, 118, 252),
palette_pack(200, 114, 89), palette_pack(212, 82, 77),
palette_pack(115, 222, 255), palette_pack(66, 235, 245),
palette_pack(238, 124, 90), palette_pack(252, 85, 84),
palette_pack(255, 166, 132), palette_pack(255, 121, 120),
palette_pack(219, 232, 92), palette_pack(212, 193, 84),
palette_pack(240, 247, 143), palette_pack(230, 206, 128),
palette_pack(78, 176, 63), palette_pack(33, 176, 59),
palette_pack(202, 118, 216), palette_pack(201, 91, 186),
palette_pack(233, 233, 233), palette_pack(204, 204, 204),
palette_pack(255, 255, 255) palette_pack(255, 255, 255)
}; };
} }
TMS9918::TMS9918(Personality p) : TMS9918::TMS9918(Personality p) :
crt_(new Outputs::CRT::CRT(342, 1, Outputs::CRT::DisplayType::NTSC60, 4)) { // 342 internal cycles are 228/227.5ths of a line, so 341.25 cycles should be a whole
// line. Therefore multiply everything by four, but set line length to 1365 rather than 342*4 = 1368.
crt_(new Outputs::CRT::CRT(1365, 4, Outputs::CRT::DisplayType::NTSC60, 4)) {
crt_->set_rgb_sampling_function( crt_->set_rgb_sampling_function(
"vec3 rgb_sample(usampler2D sampler, vec2 coordinate, vec2 icoordinate)" "vec3 rgb_sample(usampler2D sampler, vec2 coordinate, vec2 icoordinate)"
"{" "{"
@ -143,10 +145,6 @@ void TMS9918::run_for(const HalfCycles cycles) {
int_cycles >>= 3; int_cycles >>= 3;
if(!int_cycles) return; if(!int_cycles) return;
//
// Break that down as:
// 26 cycles sync;
while(int_cycles) { while(int_cycles) {
// Determine how much time has passed in the remainder of this line, and proceed. // Determine how much time has passed in the remainder of this line, and proceed.
int cycles_left = std::min(342 - column_, int_cycles); int cycles_left = std::min(342 - column_, int_cycles);
@ -293,7 +291,8 @@ void TMS9918::run_for(const HalfCycles cycles) {
// Output horizontal sync // Output horizontal sync
// ---------------------- // ----------------------
if(!output_column_ && column_ >= 26) { if(!output_column_ && column_ >= 26) {
crt_->output_sync(static_cast<unsigned int>(26)); crt_->output_sync(13 * 4);
crt_->output_default_colour_burst(13 * 4);
output_column_ = 26; output_column_ = 26;
} }
@ -440,7 +439,7 @@ void TMS9918::run_for(const HalfCycles cycles) {
} }
if(output_column_ == first_right_border_column_) { if(output_column_ == first_right_border_column_) {
crt_->output_data(static_cast<unsigned int>(first_right_border_column_ - first_pixel_column_), 1); crt_->output_data(static_cast<unsigned int>(first_right_border_column_ - first_pixel_column_) * 4, 4);
pixel_target_ = nullptr; pixel_target_ = nullptr;
} }
} }
@ -456,12 +455,13 @@ void TMS9918::run_for(const HalfCycles cycles) {
} else if(row_ >= first_vsync_line_ && row_ < first_vsync_line_+3) { } else if(row_ >= first_vsync_line_ && row_ < first_vsync_line_+3) {
// Vertical sync. // Vertical sync.
if(column_ == 342) { if(column_ == 342) {
crt_->output_sync(static_cast<unsigned int>(342)); crt_->output_sync(342 * 4);
} }
} else { } else {
// Blank. // Blank.
if(!output_column_ && column_ >= 26) { if(!output_column_ && column_ >= 26) {
crt_->output_sync(static_cast<unsigned int>(26)); crt_->output_sync(13 * 4);
crt_->output_default_colour_burst(13 * 4);
output_column_ = 26; output_column_ = 26;
} }
if(output_column_ >= 26) { if(output_column_ >= 26) {
@ -504,7 +504,7 @@ void TMS9918::run_for(const HalfCycles cycles) {
void TMS9918::output_border(int cycles) { void TMS9918::output_border(int cycles) {
pixel_target_ = reinterpret_cast<uint32_t *>(crt_->allocate_write_area(1)); pixel_target_ = reinterpret_cast<uint32_t *>(crt_->allocate_write_area(1));
if(pixel_target_) *pixel_target_ = palette[background_colour_]; if(pixel_target_) *pixel_target_ = palette[background_colour_];
crt_->output_level(static_cast<unsigned int>(cycles)); crt_->output_level(static_cast<unsigned int>(cycles) * 4);
} }
// TODO: as a temporary development measure, memory access below is magically instantaneous. Correct that. // TODO: as a temporary development measure, memory access below is magically instantaneous. Correct that.