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Corrected to give a not-exactly-indexed-correctly approximation of what's on display.

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This commit is contained in:
Thomas Harte 2018-09-28 21:03:51 -04:00
parent f7e211c245
commit 7b9bb772ca
2 changed files with 14 additions and 4 deletions
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14
Components/9918/9918.cpp
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@ -436,9 +436,19 @@ void TMS9918::run_for(const HalfCycles cycles) {
case LineMode::SMS: {
if(pixel_target_) {
const int pixels_left = pixels_end - output_column_;
int pixel_location = output_column_ - first_pixel_column_;
const int pixel_location = output_column_ - first_pixel_column_;
for(int c = 0; c < pixels_left; ++c) {
pixel_target_[c] = *(uint32_t *)master_system_.tile_graphics[pixel_location >> 8];
const int column = (pixel_location + c) >> 3;
const int shift = 4 + ((pixel_location + c) & 7);
int value =
((
((master_system_.tile_graphics[column][0] << shift) & 0x800) |
((master_system_.tile_graphics[column][1] << (shift - 1)) & 0x400) |
((master_system_.tile_graphics[column][2] << (shift - 2)) & 0x200) |
(master_system_.tile_graphics[column][3] << (shift - 3))
) >> 8) << 4;
pixel_target_[c] = (value << 24) | (value << 16) | (value << 8) | value;
}
pixel_target_ += pixels_left;
}

4
Components/9918/Implementation/9918Base.hpp
View File

@ -218,7 +218,7 @@ class Base {
#define fetch_tile_name(column) {\
size_t address = pattern_address_base + ((column) << 1); \
master_system_.names[column].flags = ram_[address+1]; \
master_system_.names[column].offset = static_cast<size_t>((master_system_.names[column].flags&1 | ram_[address]) << 5) + sub_row; \
master_system_.names[column].offset = static_cast<size_t>((((master_system_.names[column].flags&1) << 8) | ram_[address]) << 5) + sub_row; \
}
#define fetch_tile(column) {\
@ -265,7 +265,7 @@ class Base {
- column n+3, tile graphic first word
- column n+3, tile graphic second word
*/
const size_t pattern_address_base = (pattern_name_address_ | size_t(0x3ff)) & static_cast<size_t>(((row_ & ~7) << 6) | 0x3800);
const size_t pattern_address_base = (pattern_name_address_ | size_t(0x3ff)) & static_cast<size_t>(((row_ & ~7) << 3) | 0x3800);
const size_t sub_row = static_cast<size_t>((row_ & 7) << 2);
switch(start) {