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Adds a first attempt at CRAM dot output. With a TODO.

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This commit is contained in:
Thomas Harte
2018-10-26 19:26:46 -04:00
parent 916710353a
commit 521d603902
2 changed files with 116 additions and 88 deletions
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Components/9918/Implementation/9918Base.hpp
+7 -3
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@@ -127,7 +127,7 @@ class Base {
// A helper function to output the current border colour for
// the number of cycles supplied.
void output_border(int cycles);
void output_border(int cycles, uint32_t cram_dot);
// A struct to contain timing information for the current mode.
struct {
@@ -343,9 +343,13 @@ class Base {
// Schedule a CRAM dot.
upcoming_cram_dots_.emplace_back();
CRAMDot &dot = upcoming_cram_dots_.back();
dot.location.row = write_pointer_.row;
dot.location.column = access_column;
dot.location.row = write_pointer_.row + (access_column / 342);
dot.location.column = access_column % 342;
dot.value = master_system_.colour_ram[ram_pointer_ & 0x1f];
// TODO: the location should actually be slightly in the past, as
// output trails memory reading; expose the length of that gap
// somewhere that makes it visible to here and adjust.
} else {
ram_[ram_pointer_ & 16383] = read_ahead_buffer_;
}