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Retrenches temporarily to full 8bpp output; introduces extra half a colour cycle of pause.

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This commit is contained in:
Thomas Harte 2018-04-15 18:54:05 -04:00
parent cd26f11818
commit 335c633884
1 changed files with 17 additions and 2 deletions
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19
Machines/AppleII/Video.cpp
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@ -18,8 +18,11 @@ Video::Video() :
"float composite_sample(usampler2D sampler, vec2 coordinate, vec2 icoordinate, float phase, float amplitude)"
"{"
"uint texValue = texture(sampler, coordinate).r;"
"texValue <<= int(icoordinate.x * 7) % 6;"
"texValue <<= int(icoordinate.x * 8) & 7;"
"return float(texValue & 128u);"
// "uint texValue = texture(sampler, coordinate).r;"
// "texValue <<= uint(icoordinate.x * 7.0) % 7u;"
// "return float(texValue & 128u);"
"}");
// Show only the centre 75% of the TV frame.
@ -50,6 +53,9 @@ void Video::run_for(const Cycles cycles) {
} else {
const int ending_column = column_ + cycles_this_line;
// The first 40 columns are submitted to the CRT only upon completion;
// they'll be either graphics or blank, depending on which side we are
// of line 192.
if(column_ < 40) {
if(row_ < 192) {
if(!column_) {
@ -60,7 +66,7 @@ void Video::run_for(const Cycles cycles) {
if(ending_column >= 40) {
for(int c = 0; c < 40; ++c) {
pixel_pointer_[c] = 0xaa;
pixel_pointer_[c] = static_cast<uint8_t>((c * 6) ^ row_);
}
crt_->output_data(280, 7);
}
@ -71,6 +77,11 @@ void Video::run_for(const Cycles cycles) {
}
}
/*
The left border, sync, right border pattern doesn't depend on whether
there were pixels this row and is output as soon as it is known.
*/
const int first_blank_start = std::max(40, column_);
const int first_blank_end = std::min(first_sync_column, ending_column);
if(first_blank_end > first_blank_start) {
@ -95,6 +106,10 @@ void Video::run_for(const Cycles cycles) {
column_ = (column_ + cycles_this_line) % 65;
if(!column_) {
row_ = (row_ + 1) % 262;
// Add an extra half a colour cycle of blank; this isn't counted in the run_for
// count explicitly but is promised.
crt_->output_blank(1);
}
}
}