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Corrects order-of-initialisation errors in the TIA.

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Thomas Harte 2017-11-10 22:57:43 -05:00
parent cb0f58ab7a
commit 4add2c1051
2 changed files with 16 additions and 24 deletions
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11
Machines/Atari2600/TIA.cpp
View File

@ -20,16 +20,7 @@ namespace {
uint8_t reverse_table[256];
}
TIA::TIA(bool create_crt) :
horizontal_counter_(0),
pixels_start_location_(0),
output_mode_(0),
pixel_target_(nullptr),
background_{0, 0},
background_half_mask_(0),
horizontal_blank_extend_(false),
collision_flags_(0)
{
TIA::TIA(bool create_crt) {
if(create_crt) {
crt_.reset(new Outputs::CRT::CRT(cycles_per_line * 2 - 1, 1, Outputs::CRT::DisplayType::NTSC60, 1));
crt_->set_output_device(Outputs::CRT::Television);

29
Machines/Atari2600/TIA.hpp
View File

@ -81,10 +81,10 @@ class TIA {
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_;
int horizontal_counter_ = 0;
// contains flags to indicate whether sync or blank are currently active
int output_mode_;
int output_mode_ = 0;
// keeps track of the target pixel buffer for this line and when it was acquired, and a corresponding collision buffer
alignas(alignof(uint32_t)) uint8_t collision_buffer_[160];
@ -97,7 +97,7 @@ class TIA {
Missile1 = (1 << 5)
};
int collision_flags_;
int collision_flags_ = 0;
int collision_flags_by_buffer_vaules_[64];
// colour mapping tables
@ -118,19 +118,20 @@ class TIA {
uint8_t colour_palette_[4];
// playfield state
int background_half_mask_;
int background_half_mask_ = 0;
enum class PlayfieldPriority {
Standard,
Score,
OnTop
} playfield_priority_;
uint32_t background_[2]; // contains two 20-bit bitfields representing the background state;
// at index 0 is the left-hand side of the playfield with bit 0 being
// the first bit to display, bit 1 the second, etc. Index 1 contains
// a mirror image of index 0. If the playfield is being displayed in
// mirroring mode, background_[0] will be output on the left and
// background_[1] on the right; otherwise background_[0] will be
// output twice.
uint32_t background_[2] = {0, 0};
// contains two 20-bit bitfields representing the background state;
// at index 0 is the left-hand side of the playfield with bit 0 being
// the first bit to display, bit 1 the second, etc. Index 1 contains
// a mirror image of index 0. If the playfield is being displayed in
// mirroring mode, background_[0] will be output on the left and
// background_[1] on the right; otherwise background_[0] will be
// output twice.
// objects
template<class T> struct Object {
@ -287,7 +288,7 @@ class TIA {
} ball_;
// motion
bool horizontal_blank_extend_;
bool horizontal_blank_extend_ = false;
template<class T> void perform_border_motion(T &object, int start, int end);
template<class T> void perform_motion_step(T &object);
@ -300,8 +301,8 @@ class TIA {
inline void output_for_cycles(int number_of_cycles);
inline void output_line();
int pixels_start_location_;
uint8_t *pixel_target_;
int pixels_start_location_ = 0;
uint8_t *pixel_target_ = nullptr;
inline void output_pixels(int start, int end);
};