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I think unit testing this thing is the only way forwards. Started adding appropriate hooks.

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This commit is contained in:
Thomas Harte 2017-02-12 19:55:02 -05:00
parent 600bdc9af7
commit 25776de59d
2 changed files with 16 additions and 6 deletions
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14
Machines/Atari2600/TIA.cpp
View File

@ -132,6 +132,11 @@ TIA::TIA() :
collision_buffer_.resize(160);
}
TIA::TIA(std::function<void(uint8_t *output_buffer)> line_end_function) : TIA()
{
line_end_function_ = line_end_function;
}
void TIA::set_output_mode(Atari2600::TIA::OutputMode output_mode)
{
// this is the NTSC phase offset function; see below for PAL
@ -402,6 +407,7 @@ void TIA::output_for_cycles(int number_of_cycles)
if(!output_cursor)
{
if(line_end_function_) line_end_function_(collision_buffer_.data());
memset(collision_buffer_.data(), 0, 160); // sizeof(collision_buffer_)
horizontal_blank_extend_ = false;
}
@ -660,14 +666,10 @@ void TIA::draw_player(Player &player, CollisionType collision_identity, const in
if(position < 16 && player.copy_flags&1)
{
next_copy = 16;
}
else
if(position < 32 && player.copy_flags&2)
} else if(position < 32 && player.copy_flags&2)
{
next_copy = 32;
}
else
if(position < 64 && player.copy_flags&4)
} else if(position < 64 && player.copy_flags&4)
{
next_copy = 64;
}

8
Machines/Atari2600/TIA.hpp
View File

@ -19,6 +19,11 @@ class TIA {
TIA();
~TIA();
// The supplied hook is for unit testing only; if instantiated with a line_end_function then it will
// be called with the latest collision buffer upon the conclusion of each line. What's a collision
// buffer? It's an implementation detail. If you're not writing a unit test, leave it alone.
TIA(std::function<void(uint8_t *output_buffer)> line_end_function);
enum class OutputMode {
NTSC, PAL
};
@ -74,6 +79,7 @@ class TIA {
private:
std::shared_ptr<Outputs::CRT::CRT> crt_;
std::function<void(uint8_t *output_buffer)> line_end_function_;
// the master counter; counts from 0 to 228 with all visible pixels being in the final 160
int horizontal_counter_;
@ -138,6 +144,8 @@ class TIA {
int pixel_position;
int output_delay;
bool graphic_delay;
Player() : size(0), copy_flags(0), graphic{0, 0}, reverse_mask(false), pixel_position(32), output_delay(0), graphic_delay(false) {}
} player_[2];
// missile state