mirror of
https://github.com/TomHarte/CLK.git
synced 2024-12-27 01:31:42 +00:00
Made an attempt to reintroduce missiles.
This commit is contained in:
Thomas Harte
parent
99547181f1
commit
7ab2358bba
@ -280,27 +280,28 @@ void TIA::set_playfield_ball_colour(uint8_t colour)
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void TIA::set_player_number_and_size(int player, uint8_t value)
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{
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int size = 0;
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switch(value & 7)
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{
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case 0: case 1: case 2: case 3: case 4:
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player_[player].size = 0;
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player_[player].copy_flags = value & 7;
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break;
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case 5:
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player_[player].size = 1;
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size = 1;
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player_[player].copy_flags = 0;
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break;
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case 6:
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player_[player].size = 0;
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player_[player].copy_flags = 6;
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break;
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case 7:
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player_[player].size = 2;
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size = 2;
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player_[player].copy_flags = 0;
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break;
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}
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missile_[player].size = (value >> 4)&3;
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missile_[player].size = 1 << ((value >> 4)&3);
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missile_[player].copy_flags = player_[player].copy_flags;
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player_[player].adder = 4 >> size;
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}
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void TIA::set_player_graphic(int player, uint8_t value)
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@ -342,18 +343,23 @@ void TIA::set_player_missile_colour(int player, uint8_t colour)
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void TIA::set_missile_enable(int missile, bool enabled)
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{
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missile_[missile].enabled = enabled;
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}
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void TIA::set_missile_position(int missile)
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{
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object_[(int)MotionIndex::Missile0 + missile].position = 0;
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}
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void TIA::set_missile_position_to_player(int missile)
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{
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// TODO: implement this correctly; should be triggered by player counter hitting the appropriate point
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object_[(int)MotionIndex::Missile0 + missile].position = object_[(int)MotionIndex::Player0 + missile].position + 5;
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}
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void TIA::set_missile_motion(int missile, uint8_t motion)
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{
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object_[(int)MotionIndex::Missile0 + missile].motion = (motion >> 4)&0xf;
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}
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void TIA::set_ball_enable(bool enabled)
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@ -371,7 +377,7 @@ void TIA::set_ball_position()
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object_[(int)MotionIndex::Ball].position = 0;
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// setting the ball position also triggers a draw
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ball_.pixel_position = ball_.size;
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ball_.reset_pixels();
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}
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void TIA::set_ball_motion(uint8_t motion)
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@ -643,7 +649,7 @@ int TIA::perform_border_motion(Object &object, int start, int end)
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return steps_taken;
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}
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template<class T> void TIA::draw_object(T &target, Object &object, int start, int end)
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template<class T> void TIA::draw_object(T &target, Object &object, const uint8_t collision_identity, int start, int end)
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{
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int first_pixel = first_pixel_cycle - 4 + (horizontal_blank_extend_ ? 8 : 0);
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@ -661,7 +667,7 @@ template<class T> void TIA::draw_object(T &target, Object &object, int start, in
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// perform the visible part of the line, if any
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if(start < 224)
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{
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draw_object_visible<T>(target, object, start - first_pixel_cycle + 4, std::min(end - first_pixel_cycle + 4, 160));
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draw_object_visible<T>(target, object, collision_identity, start - first_pixel_cycle + 4, std::min(end - first_pixel_cycle + 4, 160));
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}
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// move further if required
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@ -672,7 +678,7 @@ template<class T> void TIA::draw_object(T &target, Object &object, int start, in
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}
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}
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template<class T> void TIA::draw_object_visible(T &target, Object &object, int start, int end)
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template<class T> void TIA::draw_object_visible(T &target, Object &object, const uint8_t collision_identity, int start, int end)
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{
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// perform a miniature event loop on (i) triggering draws; (ii) drawing; and (iii) motion
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int next_motion_time = object.motion_time - first_pixel_cycle + 4;
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@ -708,7 +714,7 @@ template<class T> void TIA::draw_object_visible(T &target, Object &object, int s
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// the decision is to progress by length
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const int length = next_event_time - start;
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target.draw_pixels(length);
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target.draw_pixels(&collision_buffer_[start], length, collision_identity);
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// the next interesting event is after next_event_time cycles, so progress
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object.position = (object.position + length) % 160;
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@ -731,209 +737,17 @@ template<class T> void TIA::draw_object_visible(T &target, Object &object, int s
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#pragma mark - Player output
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void TIA::draw_player_visible(Player &player, Object &object, CollisionType collision_identity, int start, int end)
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{
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int adder = 4 >> player.size;
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// perform a miniature event loop on (i) triggering draws; (ii) drawing; and (iii) motion
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int next_motion_time = object.motion_time - first_pixel_cycle + 4;
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while(start < end)
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{
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int next_event_time = end;
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// is the next event a movement tick?
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if(object.is_moving && next_motion_time < next_event_time)
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{
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next_event_time = next_motion_time;
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}
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// is the next event a graphics trigger?
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int next_copy = 160;
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if(object.position < 16 && player.copy_flags&1)
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{
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next_copy = 16;
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} else if(object.position < 32 && player.copy_flags&2)
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{
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next_copy = 32;
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} else if(object.position < 64 && player.copy_flags&4)
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{
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next_copy = 64;
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}
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int next_copy_time = start + next_copy - object.position;
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if(next_copy_time < next_event_time) next_event_time = next_copy_time;
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// the decision is to progress by length
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const int length = next_event_time - start;
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if(player.pixel_position < 32)
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{
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player.pixel_position &= ~(adder - 1);
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if(player.graphic[player.graphic_index])
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{
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int output_cursor = 0;
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while(player.pixel_position < 32 && output_cursor < length)
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{
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int shift = (player.pixel_position >> 2) ^ player.reverse_mask;
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collision_buffer_[start + output_cursor] |= ((player.graphic[player.graphic_index] >> shift)&1) * (uint8_t)collision_identity;
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output_cursor++;
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player.pixel_position += adder;
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}
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}
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else
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{
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player.pixel_position = std::max(32, player.pixel_position + length * adder);
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}
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}
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// the next interesting event is after next_event_time cycles, so progress
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object.position = (object.position + length) % 160;
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start = next_event_time;
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// if the event is a motion tick, apply
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if(object.is_moving && start == next_motion_time)
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{
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perform_motion_step(object);
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next_motion_time += 4;
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}
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// if it's a draw trigger, trigger a draw
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if(start == next_copy_time)
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{
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player.pixel_position = 0;
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}
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}
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}
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void TIA::draw_player(Player &player, Object &object, CollisionType collision_identity, int start, int end)
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{
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int adder = 4 >> player.size;
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int first_pixel = first_pixel_cycle - 4 + (horizontal_blank_extend_ ? 8 : 0);
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// movement works across the entire screen, so do work that falls outside of the pixel area
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if(start < first_pixel)
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{
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player.pixel_position = std::min(32, player.pixel_position + adder * perform_border_motion(object, start, std::max(end, first_pixel)));
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}
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// don't continue to do any drawing if this window ends too early
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if(end < first_pixel) return;
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if(start < first_pixel) start = first_pixel;
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if(start >= end) return;
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// perform the visible part of the line, if any
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if(start < 224)
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{
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draw_player_visible(player, object, collision_identity, start - first_pixel_cycle + 4, std::min(end - first_pixel_cycle + 4, 160));
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}
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// move further if required
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if(object.is_moving && end >= 224 && object.motion_time < end)
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{
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perform_motion_step(object);
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player.pixel_position = std::min(32, player.pixel_position + adder);
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}
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draw_object<Player>(player, object, (uint8_t)collision_identity, start, end);
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}
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#pragma mark - Missile output
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void TIA::draw_missile(Missile &missile, Object &object, CollisionType collision_identity, int start, int end)
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{
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draw_object<Missile>(missile, object, (uint8_t)collision_identity, start, end);
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}
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void TIA::draw_missile_visible(Missile &missile, Object &object, CollisionType collision_identity, int start, int end)
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{
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}
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#pragma mark - Ball output
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void TIA::draw_ball(Object &object, int start, int end)
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{
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int first_pixel = first_pixel_cycle - 4 + (horizontal_blank_extend_ ? 8 : 0);
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// movement works across the entire screen, so do work that falls outside of the pixel area
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if(start < first_pixel)
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{
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ball_.pixel_position = std::max(0, ball_.pixel_position - perform_border_motion(object, start, std::max(end, first_pixel)));
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}
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// don't continue to do any drawing if this window ends too early
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if(end < first_pixel) return;
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if(start < first_pixel) start = first_pixel;
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if(start >= end) return;
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// perform the visible part of the line, if any
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if(start < 224)
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{
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draw_ball_visible(object, start - first_pixel_cycle + 4, std::min(end - first_pixel_cycle + 4, 160));
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}
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// move further if required
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if(object_[(int)MotionIndex::Ball].is_moving && end >= 224 && object_[(int)MotionIndex::Ball].motion_time < end)
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{
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perform_motion_step(object);
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ball_.pixel_position = std::max(0, ball_.pixel_position - 1);
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}
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}
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void TIA::draw_ball_visible(Object &object, int start, int end)
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{
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// perform a miniature event loop on (i) triggering draws; (ii) drawing; and (iii) motion
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int next_motion_time = object.motion_time - first_pixel_cycle + 4;
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while(start < end)
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{
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int next_event_time = end;
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// is the next event a movement tick?
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if(object.is_moving && next_motion_time < next_event_time)
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{
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next_event_time = next_motion_time;
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}
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// is the next event a graphics trigger?
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if(ball_.enabled[ball_.enabled_index])
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{
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int time_until_copy = 160 - object.position;
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int next_copy_time = start + time_until_copy;
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if(next_copy_time < next_event_time) next_event_time = next_copy_time;
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}
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// the decision is to progress by length
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const int length = next_event_time - start;
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if(ball_.pixel_position)
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{
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int output_cursor = 0;
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if(ball_.enabled[ball_.enabled_index])
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{
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while(ball_.pixel_position && output_cursor < length)
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{
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collision_buffer_[start + output_cursor] |= (uint8_t)CollisionType::Ball;
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output_cursor++;
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ball_.pixel_position--;
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}
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}
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else
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{
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ball_.pixel_position = std::max(0, ball_.pixel_position - length);
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}
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}
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// the next interesting event is after next_event_time cycles, so progress
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object.position = (object.position + length) % 160;
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start = next_event_time;
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// if the event is a motion tick, apply
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if(object.is_moving && start == next_motion_time)
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{
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perform_motion_step(object);
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next_motion_time += 4;
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}
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// if it's a draw trigger, trigger a draw
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if(!object.position)
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{
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ball_.pixel_position = ball_.size;
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}
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}
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draw_object<Ball>(ball_, object, (uint8_t)CollisionType::Ball, start, end);
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}
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@ -137,7 +137,7 @@ class TIA {
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// player state
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struct Player {
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int size; // 0 = normal, 1 = double, 2 = quad
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int adder;
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int copy_flags; // a bit field, corresponding to the first few values of NUSIZ
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uint8_t graphic[2]; // the player graphic; 1 = new, 0 = current
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int reverse_mask; // 7 for a reflected player, 0 for normal
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@ -145,12 +145,75 @@ class TIA {
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int pixel_position;
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Player() : size(0), copy_flags(0), graphic{0, 0}, reverse_mask(false), pixel_position(32), graphic_index(0) {}
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inline void skip_pixels(int count)
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{
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pixel_position = std::min(32, pixel_position + count * adder);
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}
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inline void reset_pixels()
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{
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pixel_position = 0;
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}
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inline void draw_pixels(uint8_t *const target, const int count, const uint8_t collision_identity)
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{
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if(pixel_position == 32) return;
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if(graphic[graphic_index])
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{
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int output_cursor = 0;
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while(pixel_position < 32 && output_cursor < count)
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{
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int shift = (pixel_position >> 2) ^ reverse_mask;
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target[output_cursor] |= ((graphic[graphic_index] >> shift)&1) * collision_identity;
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output_cursor++;
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pixel_position += adder;
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}
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}
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else
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{
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skip_pixels(count);
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}
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}
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Player() : copy_flags(0), graphic{0, 0}, reverse_mask(false), pixel_position(32), graphic_index(0) {}
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} player_[2];
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// missile state
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struct Missile {
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int size; // 0 = 1 pixel, 1 = 2 pixels, etc
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bool enabled;
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int size;
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int copy_flags;
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int pixel_position;
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inline void skip_pixels(int count)
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{
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pixel_position = std::max(0, pixel_position - count);
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}
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inline void reset_pixels()
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{
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pixel_position = size;
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}
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inline void draw_pixels(uint8_t *const target, const int count, const uint8_t collision_identity)
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{
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if(!pixel_position) return;
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if(enabled)
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{
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int output_cursor = 0;
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while(pixel_position && output_cursor < count)
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{
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target[output_cursor] |= collision_identity;
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output_cursor++;
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pixel_position--;
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}
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}
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else
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{
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skip_pixels(count);
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}
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}
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} missile_[2];
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// ball state
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@ -158,9 +221,39 @@ class TIA {
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bool enabled[2];
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int enabled_index;
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int size;
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const int copy_flags = 0;
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int pixel_position;
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inline void skip_pixels(int count)
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{
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pixel_position = std::max(0, pixel_position - count);
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}
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inline void reset_pixels()
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{
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pixel_position = size;
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}
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inline void draw_pixels(uint8_t *const target, const int count, const uint8_t collision_identity)
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{
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if(!pixel_position) return;
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if(enabled[enabled_index])
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{
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int output_cursor = 0;
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while(pixel_position && output_cursor < count)
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{
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target[output_cursor] |= collision_identity;
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output_cursor++;
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pixel_position--;
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}
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}
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else
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{
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skip_pixels(count);
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}
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}
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Ball() : pixel_position(0), size(1), enabled_index(0) {}
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} ball_;
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@ -193,22 +286,16 @@ class TIA {
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inline void perform_motion_step(Object &object);
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// drawing methods and state
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template<class T> void draw_object(T &, Object &, int start, int end);
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template<class T> void draw_object_visible(T &, Object &, int start, int end);
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template<class T> void draw_object(T &, Object &, const uint8_t collision_identity, int start, int end);
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template<class T> void draw_object_visible(T &, Object &, const uint8_t collision_identity, int start, int end);
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inline void output_for_cycles(int number_of_cycles);
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inline void output_line();
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inline void draw_playfield(int start, int end);
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inline void draw_player(Player &player, Object &object, CollisionType collision_identity, int start, int end);
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inline void draw_player_visible(Player &player, Object &object, CollisionType collision_identity, int start, int end);
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inline void draw_missile(Missile &missile, Object &object, CollisionType collision_identity, int start, int end);
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inline void draw_missile_visible(Missile &missile, Object &object, CollisionType collision_identity, int start, int end);
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inline void draw_ball(Object &object, int start, int end);
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inline void draw_ball_visible(Object &object, int start, int end);
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int pixels_start_location_;
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uint8_t *pixel_target_;
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