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Shift the h-within-v pulse to eliminate a curved top line.

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This commit is contained in:
Thomas Harte 2018-06-24 11:27:18 -04:00
parent 04f6cb1750
commit 640a84d456
1 changed files with 9 additions and 8 deletions
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17
Machines/AppleII/Video.hpp
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@ -82,8 +82,9 @@ template <class BusHandler> class Video: public VideoBase {
A frame is oriented around 65 cycles across, 262 lines down. A frame is oriented around 65 cycles across, 262 lines down.
*/ */
const int first_sync_line = 220; // A complete guess. Information needed. static const int first_sync_line = 220; // A complete guess. Information needed.
const int first_sync_column = 49; // Also a guess. static const int first_sync_column = 49; // Also a guess.
static const int sync_length = 4; // One of the two likely candidates.
int int_cycles = cycles.as_int(); int int_cycles = cycles.as_int();
while(int_cycles) { while(int_cycles) {
@ -93,8 +94,8 @@ template <class BusHandler> class Video: public VideoBase {
if(row_ >= first_sync_line && row_ < first_sync_line + 3) { if(row_ >= first_sync_line && row_ < first_sync_line + 3) {
// In effect apply an XOR to HSYNC and VSYNC flags in order to include equalising // In effect apply an XOR to HSYNC and VSYNC flags in order to include equalising
// pulses (and hencce keep hsync approximately where it should be during vsync). // pulses (and hencce keep hsync approximately where it should be during vsync).
const int blank_start = std::max(first_sync_column, column_); const int blank_start = std::max(first_sync_column - sync_length, column_);
const int blank_end = std::min(first_sync_column + 4, ending_column); const int blank_end = std::min(first_sync_column, ending_column);
if(blank_end > blank_start) { if(blank_end > blank_start) {
if(blank_start > column_) { if(blank_start > column_) {
crt_->output_sync(static_cast<unsigned int>(blank_start - column_) * 14); crt_->output_sync(static_cast<unsigned int>(blank_start - column_) * 14);
@ -235,15 +236,15 @@ template <class BusHandler> class Video: public VideoBase {
} }
const int sync_start = std::max(first_sync_column, column_); const int sync_start = std::max(first_sync_column, column_);
const int sync_end = std::min(first_sync_column + 4, ending_column); const int sync_end = std::min(first_sync_column + sync_length, ending_column);
if(sync_end > sync_start) { if(sync_end > sync_start) {
crt_->output_sync(static_cast<unsigned int>(sync_end - sync_start) * 14); crt_->output_sync(static_cast<unsigned int>(sync_end - sync_start) * 14);
} }
int second_blank_start; int second_blank_start;
if(line_mode != GraphicsMode::Text && (!mixed_mode_ || row_ < 159 || row_ >= 192)) { if(line_mode != GraphicsMode::Text && (!mixed_mode_ || row_ < 159 || row_ >= 192)) {
const int colour_burst_start = std::max(first_sync_column + 4, column_); const int colour_burst_start = std::max(first_sync_column + sync_length + 1, column_);
const int colour_burst_end = std::min(first_sync_column + 7, ending_column); const int colour_burst_end = std::min(first_sync_column + sync_length + 4, ending_column);
if(colour_burst_end > colour_burst_start) { if(colour_burst_end > colour_burst_start) {
crt_->output_default_colour_burst(static_cast<unsigned int>(colour_burst_end - colour_burst_start) * 14); crt_->output_default_colour_burst(static_cast<unsigned int>(colour_burst_end - colour_burst_start) * 14);
} }
@ -321,7 +322,7 @@ template <class BusHandler> class Video: public VideoBase {
static_cast<uint16_t>(((video_page_+1) * 0x400) + row_address); static_cast<uint16_t>(((video_page_+1) * 0x400) + row_address);
} }
const int flash_length = 8406; static const int flash_length = 8406;
BusHandler &bus_handler_; BusHandler &bus_handler_;
void output_data_to_column(int column) { void output_data_to_column(int column) {
int length = column - pixel_pointer_column_; int length = column - pixel_pointer_column_;