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Attempted to fix failure of sprites properly to wrap when performing motion.

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This commit is contained in:
Thomas Harte 2017-02-21 21:53:09 -05:00
parent 36396b3d62
commit f4447fd9cd
2 changed files with 14 additions and 20 deletions
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30
Machines/Atari2600/TIA.cpp
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@ -629,31 +629,27 @@ void TIA::draw_playfield(int start, int end)
#pragma mark - Motion
void TIA::perform_motion_step(Object &object)
template<class T> void TIA::perform_motion_step(T &object)
{
if((object.motion_step ^ (object.motion ^ 8)) == 0xf)
object.is_moving = false;
else
{
object.position ++;
if(object.position == 159) object.reset_pixels();
else if(object.position == 15 && object.copy_flags&1) object.reset_pixels();
else if(object.position == 31 && object.copy_flags&2) object.reset_pixels();
else if(object.position == 63 && object.copy_flags&4) object.reset_pixels();
else object.skip_pixels(1);
object.position = (object.position + 1) % 160;
object.motion_step --;
object.motion_time += 4;
}
}
int TIA::perform_border_motion(Object &object, int start, int end)
template<class T> void TIA::perform_border_motion(T &object, int start, int end)
{
if(!object.is_moving) return 0;
int steps_taken = 0;
while(object.is_moving && object.motion_time < end)
{
perform_motion_step(object);
steps_taken++;
}
object.position %= 160;
return steps_taken;
perform_motion_step<T>(object);
}
template<class T> void TIA::draw_object(T &object, const uint8_t collision_identity, int start, int end)
@ -663,7 +659,7 @@ template<class T> void TIA::draw_object(T &object, const uint8_t collision_ident
// movement works across the entire screen, so do work that falls outside of the pixel area
if(start < first_pixel)
{
object.skip_pixels(perform_border_motion(object, start, std::max(end, first_pixel)));
perform_border_motion<T>(object, start, std::max(end, first_pixel));
}
// don't continue to do any drawing if this window ends too early
@ -680,8 +676,7 @@ template<class T> void TIA::draw_object(T &object, const uint8_t collision_ident
// move further if required
if(object.is_moving && end >= 224 && object.motion_time < end)
{
perform_motion_step(object);
object.skip_pixels(1);
perform_motion_step<T>(object);
}
}
@ -733,9 +728,8 @@ template<class T> void TIA::draw_object_visible(T &object, const uint8_t collisi
perform_motion_step(object);
next_motion_time += 4;
}
// if it's a draw trigger, trigger a draw
if(start == next_copy_time)
else if(start == next_copy_time)
{
object.reset_pixels();
}

4
Machines/Atari2600/TIA.hpp
View File

@ -270,8 +270,8 @@ class TIA {
// motion
bool horizontal_blank_extend_;
inline int perform_border_motion(Object &object, int start, int end);
inline void perform_motion_step(Object &object);
template<class T> void perform_border_motion(T &object, int start, int end);
template<class T> void perform_motion_step(T &object);
// drawing methods and state
template<class T> void draw_object(T &, const uint8_t collision_identity, int start, int end);