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Sprites: avoid magic constants, ensure proper DMA resumption.

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This commit is contained in:
Thomas Harte 2021-11-26 16:02:18 -05:00
parent 1c0962e53c
commit eca80f1425
3 changed files with 16 additions and 12 deletions
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23
Machines/Amiga/Chipset.cpp
View File

@ -56,8 +56,8 @@ static_assert(expand_bitplane_byte(0x00) == 0x00'00'00'00'00'00'00'00);
Chipset::Chipset(MemoryMap &map, int input_clock_rate) :
blitter_(DMA_CONSTRUCT),
sprites_{
{DMA_CONSTRUCT}, {DMA_CONSTRUCT}, {DMA_CONSTRUCT}, {DMA_CONSTRUCT},
{DMA_CONSTRUCT}, {DMA_CONSTRUCT}, {DMA_CONSTRUCT}, {DMA_CONSTRUCT}
Sprite{DMA_CONSTRUCT}, Sprite{DMA_CONSTRUCT}, Sprite{DMA_CONSTRUCT}, Sprite{DMA_CONSTRUCT},
Sprite{DMA_CONSTRUCT}, Sprite{DMA_CONSTRUCT}, Sprite{DMA_CONSTRUCT}, Sprite{DMA_CONSTRUCT}
},
bitplanes_(DMA_CONSTRUCT),
copper_(DMA_CONSTRUCT),
@ -126,7 +126,8 @@ template <int cycle> void Chipset::output() {
// Trigger any sprite loads encountered.
constexpr auto dcycle = cycle << 1;
for(int c = 0; c < 8; c += 2) {
static_assert(std::tuple_size<decltype(sprites_)>::value % 2 == 0);
for(size_t c = 0; c < sprites_.size(); c += 2) {
if( sprites_[c].visible &&
dcycle <= sprites_[c].h_start &&
dcycle+2 > sprites_[c].h_start) {
@ -292,12 +293,14 @@ template <int cycle> void Chipset::output() {
pixels_[3] = swizzled_palette_[source & 0xff];
}
for(int c = 3; c >= 0; --c) {
const auto data = sprite_shifters_[c].get();
size_t index = sprite_shifters_.size();
for(auto shifter = sprite_shifters_.rbegin(); shifter != sprite_shifters_.rend(); ++shifter) {
--index;
const auto data = shifter->get();
if(!data) continue;
const int base = (c << 2) + 16;
const auto base = (index << 2) + 16;
if(sprites_[(c << 1) + 1].attached) {
if(sprites_[(index << 1) + 1].attached) {
// Left pixel.
if(data >> 4) {
pixels_[0] = pixels_[1] = palette_[16 + (data >> 4)];
@ -434,7 +437,7 @@ template <int cycle, bool stop_if_cpu> bool Chipset::perform_cycle() {
if constexpr (cycle >= 0x15 && cycle < 0x35) {
if((dma_control_ & SpritesFlag) == SpritesFlag && y_ >= vertical_blank_height_) {
constexpr auto sprite_id = (cycle - 0x15) >> 2;
static_assert(sprite_id >= 0 && sprite_id < 8);
static_assert(sprite_id >= 0 && sprite_id < std::tuple_size<decltype(sprites_)>::value);
if(sprites_[sprite_id].advance_dma(cycle&2)) {
return false;
@ -568,8 +571,8 @@ template <bool stop_on_cpu> Chipset::Changes Chipset::run(HalfCycles length) {
is_long_field_ ^= interlace_;
}
for(int c = 0; c < 8; c++) {
sprites_[c].advance_line(y_, y_ == vertical_blank_height_);
for(auto &sprite: sprites_) {
sprite.advance_line(y_, y_ == vertical_blank_height_);
}
}
assert(line_cycle_ < line_length_ * 4);

4
Machines/Amiga/Chipset.hpp
View File

@ -143,8 +143,8 @@ class Chipset: private ClockingHint::Observer {
// MARK: - Sprites.
Sprite sprites_[8];
TwoSpriteShifter sprite_shifters_[4];
std::array<Sprite, 8> sprites_;
std::array<TwoSpriteShifter, 4> sprite_shifters_;
// MARK: - Raster position and state.

1
Machines/Amiga/Sprites.cpp
View File

@ -59,6 +59,7 @@ void Sprite::advance_line(int y, bool is_end_of_blank) {
}
if(is_end_of_blank || y == v_stop_) {
dma_state_ = DMAState::FetchControl;
visible = true;
}
}