Mercurial > repos > blastem
diff blastem.c @ 421:d0cacb4ade0b
Move IO code to a separate file and do a tiny bit of refactoring
author | Mike Pavone <pavone@retrodev.com> |
---|---|
date | Tue, 25 Jun 2013 19:20:39 -0700 |
parents | dbf4e1c86f3c |
children | 642b2f8aee32 |
line wrap: on
line diff
--- a/blastem.c Mon Jun 24 21:32:25 2013 -0700 +++ b/blastem.c Tue Jun 25 19:20:39 2013 -0700 @@ -22,7 +22,6 @@ #define MCLKS_PER_PSG (MCLKS_PER_Z80*16) //TODO: Figure out the exact value for this -#define CYCLE_NEVER 0xFFFFFFFF #define LINES_NTSC 262 #define LINES_PAL 312 @@ -32,9 +31,6 @@ uint16_t ram[RAM_WORDS]; uint8_t z80_ram[Z80_RAM_BYTES]; -io_port gamepad_1; -io_port gamepad_2; - int headless = 0; int z80_enabled = 1; int frame_limit = 0; @@ -230,8 +226,9 @@ frame++; mclks -= mclks_per_frame; vdp_adjust_cycles(v_context, mclks_per_frame); - io_adjust_cycles(&gamepad_1, context->current_cycle, mclks_per_frame/MCLKS_PER_68K); - io_adjust_cycles(&gamepad_2, context->current_cycle, mclks_per_frame/MCLKS_PER_68K); + io_adjust_cycles(gen->ports, context->current_cycle, mclks_per_frame/MCLKS_PER_68K); + io_adjust_cycles(gen->ports+1, context->current_cycle, mclks_per_frame/MCLKS_PER_68K); + io_adjust_cycles(gen->ports+2, context->current_cycle, mclks_per_frame/MCLKS_PER_68K); if (busack_cycle != CYCLE_NEVER) { if (busack_cycle > mclks_per_frame/MCLKS_PER_68K) { busack_cycle -= mclks_per_frame/MCLKS_PER_68K; @@ -288,8 +285,10 @@ wait_render_frame(v_context, frame_limit); } vdp_adjust_cycles(v_context, mclks_per_frame); - io_adjust_cycles(&gamepad_1, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); - io_adjust_cycles(&gamepad_2, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); + genesis_context * gen = context->system; + io_adjust_cycles(gen->ports, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); + io_adjust_cycles(gen->ports+1, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); + io_adjust_cycles(gen->ports+2, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); if (busack_cycle != CYCLE_NEVER) { if (busack_cycle > mclks_per_frame/MCLKS_PER_68K) { busack_cycle -= mclks_per_frame/MCLKS_PER_68K; @@ -313,8 +312,10 @@ wait_render_frame(v_context, frame_limit); } vdp_adjust_cycles(v_context, mclks_per_frame); - io_adjust_cycles(&gamepad_1, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); - io_adjust_cycles(&gamepad_2, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); + genesis_context * gen = context->system; + io_adjust_cycles(gen->ports, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); + io_adjust_cycles(gen->ports+1, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); + io_adjust_cycles(gen->ports+2, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); if (busack_cycle != CYCLE_NEVER) { if (busack_cycle > mclks_per_frame/MCLKS_PER_68K) { busack_cycle -= mclks_per_frame/MCLKS_PER_68K; @@ -421,76 +422,6 @@ } } -#define TH 0x40 -#define TH_TIMEOUT 8000 - -void io_adjust_cycles(io_port * pad, uint32_t current_cycle, uint32_t deduction) -{ - /*uint8_t control = pad->control | 0x80; - uint8_t th = control & pad->output; - if (pad->input[GAMEPAD_TH0] || pad->input[GAMEPAD_TH1]) { - printf("adjust_cycles | control: %X, TH: %X, GAMEPAD_TH0: %X, GAMEPAD_TH1: %X, TH Counter: %d, Timeout: %d, Cycle: %d\n", control, th, pad->input[GAMEPAD_TH0], pad->input[GAMEPAD_TH1], pad->th_counter,pad->timeout_cycle, current_cycle); - }*/ - if (current_cycle >= pad->timeout_cycle) { - pad->th_counter = 0; - } else { - pad->timeout_cycle -= deduction; - } - if (busack_cycle < CYCLE_NEVER && current_cycle < busack_cycle) { - busack_cycle -= deduction; - } -} - -void io_data_write(io_port * pad, m68k_context * context, uint8_t value) -{ - if (pad->control & TH) { - //check if TH has changed - if ((pad->output & TH) ^ (value & TH)) { - if (context->current_cycle >= pad->timeout_cycle) { - pad->th_counter = 0; - } - if (!(value & TH)) { - pad->th_counter++; - } - pad->timeout_cycle = context->current_cycle + TH_TIMEOUT; - } - } - pad->output = value; -} - -uint8_t io_data_read(io_port * pad, m68k_context * context) -{ - uint8_t control = pad->control | 0x80; - uint8_t th = control & pad->output; - uint8_t input; - if (context->current_cycle >= pad->timeout_cycle) { - pad->th_counter = 0; - } - /*if (pad->input[GAMEPAD_TH0] || pad->input[GAMEPAD_TH1]) { - printf("io_data_read | control: %X, TH: %X, GAMEPAD_TH0: %X, GAMEPAD_TH1: %X, TH Counter: %d, Timeout: %d, Cycle: %d\n", control, th, pad->input[GAMEPAD_TH0], pad->input[GAMEPAD_TH1], pad->th_counter,pad->timeout_cycle, context->current_cycle); - }*/ - if (th) { - if (pad->th_counter == 3) { - input = pad->input[GAMEPAD_EXTRA]; - } else { - input = pad->input[GAMEPAD_TH1]; - } - } else { - if (pad->th_counter == 3) { - input = pad->input[GAMEPAD_TH0] | 0xF; - } else if(pad->th_counter == 4) { - input = pad->input[GAMEPAD_TH0] & 0x30; - } else { - input = pad->input[GAMEPAD_TH0] | 0xC; - } - } - uint8_t value = ((~input) & (~control)) | (pad->output & control); - /*if (pad->input[GAMEPAD_TH0] || pad->input[GAMEPAD_TH1]) { - printf ("value: %X\n", value); - }*/ - return value; -} - uint32_t zram_counter = 0; #define Z80_ACK_DELAY 3 #define Z80_BUSY_DELAY 1//TODO: Find the actual value for this @@ -538,18 +469,22 @@ switch(location/2) { case 0x1: - io_data_write(&gamepad_1, context, value); + io_data_write(gen->ports, value, context->current_cycle); break; case 0x2: - io_data_write(&gamepad_2, context, value); + io_data_write(gen->ports+1, value, context->current_cycle); break; - case 0x3://PORT C Data + case 0x3: + io_data_write(gen->ports+2, value, context->current_cycle); break; case 0x4: - gamepad_1.control = value; + gen->ports[0].control = value; break; case 0x5: - gamepad_2.control = value; + gen->ports[1].control = value; + break; + case 0x6: + gen->ports[2].control = value; break; } } else { @@ -655,21 +590,22 @@ value = version_reg; break; case 0x1: - value = io_data_read(&gamepad_1, context); + value = io_data_read(gen->ports, context->current_cycle); break; case 0x2: - value = io_data_read(&gamepad_2, context); + value = io_data_read(gen->ports+1, context->current_cycle); break; - case 0x3://PORT C Data + case 0x3: + value = io_data_read(gen->ports+2, context->current_cycle); break; case 0x4: - value = gamepad_1.control; + value = gen->ports[0].control; break; case 0x5: - value = gamepad_2.control; + value = gen->ports[1].control; break; - case 0x6://PORT C control - value = 0; + case 0x6: + value = gen->ports[2].control; break; default: value = 0xFF; @@ -846,302 +782,6 @@ return context; } -enum { - BIND_NONE, - BIND_GAMEPAD1, - BIND_GAMEPAD2, - BIND_UI -}; - -typedef enum { - UI_DEBUG_MODE_INC, - UI_DEBUG_PAL_INC, - UI_ENTER_DEBUGGER -} ui_action; - -typedef struct { - uint8_t bind_type; - uint8_t subtype_a; - uint8_t subtype_b; - uint8_t value; -} keybinding; - -typedef struct { - keybinding bindings[4]; - uint8_t state; -} joydpad; - -keybinding * bindings[256]; -keybinding * joybindings[MAX_JOYSTICKS]; -joydpad * joydpads[MAX_JOYSTICKS]; -const uint8_t dpadbits[] = {RENDER_DPAD_UP, RENDER_DPAD_DOWN, RENDER_DPAD_LEFT, RENDER_DPAD_RIGHT}; - -void bind_key(int keycode, uint8_t bind_type, uint8_t subtype_a, uint8_t subtype_b, uint8_t value) -{ - int bucket = keycode >> 8 & 0xFF; - if (!bindings[bucket]) { - bindings[bucket] = malloc(sizeof(keybinding) * 256); - memset(bindings[bucket], 0, sizeof(keybinding) * 256); - } - int idx = keycode & 0xFF; - bindings[bucket][idx].bind_type = bind_type; - bindings[bucket][idx].subtype_a = subtype_a; - bindings[bucket][idx].subtype_b = subtype_b; - bindings[bucket][idx].value = value; -} - -void bind_button(int joystick, int button, uint8_t bind_type, uint8_t subtype_a, uint8_t subtype_b, uint8_t value) -{ - if (joystick >= MAX_JOYSTICKS) { - return; - } - if (!joybindings[joystick]) { - int num = render_joystick_num_buttons(joystick); - if (!num) { - return; - } - joybindings[joystick] = malloc(sizeof(keybinding)*num); - memset(joybindings[joystick], 0, sizeof(keybinding)*num); - } - joybindings[joystick][button].bind_type = bind_type; - joybindings[joystick][button].subtype_a = subtype_a; - joybindings[joystick][button].subtype_b = subtype_b; - joybindings[joystick][button].value = value; -} - -void bind_dpad(int joystick, int dpad, int direction, uint8_t bind_type, uint8_t subtype_a, uint8_t subtype_b, uint8_t value) -{ - if (joystick >= MAX_JOYSTICKS) { - return; - } - if (!joydpads[joystick]) { - int num = render_joystick_num_hats(joystick); - if (!num) { - return; - } - joydpads[joystick] = malloc(sizeof(joydpad)*num); - memset(joydpads[joystick], 0, sizeof(joydpad)*num); - } - for (int i = 0; i < 4; i ++) { - if (dpadbits[i] & direction) { - joydpads[joystick][dpad].bindings[i].bind_type = bind_type; - joydpads[joystick][dpad].bindings[i].subtype_a = subtype_a; - joydpads[joystick][dpad].bindings[i].subtype_b = subtype_b; - joydpads[joystick][dpad].bindings[i].value = value; - break; - } - } -} - -#define GAMEPAD_BUTTON(PRI_SLOT, SEC_SLOT, VALUE) (PRI_SLOT << 12 | SEC_SLOT << 8 | VALUE) - -#define DPAD_UP GAMEPAD_BUTTON(GAMEPAD_TH0, GAMEPAD_TH1, 0x01) -#define BUTTON_Z GAMEPAD_BUTTON(GAMEPAD_EXTRA, GAMEPAD_NONE, 0x01) -#define DPAD_DOWN GAMEPAD_BUTTON(GAMEPAD_TH0, GAMEPAD_TH1, 0x02) -#define BUTTON_Y GAMEPAD_BUTTON(GAMEPAD_EXTRA, GAMEPAD_NONE, 0x02) -#define DPAD_LEFT GAMEPAD_BUTTON(GAMEPAD_TH1, GAMEPAD_NONE, 0x04) -#define BUTTON_X GAMEPAD_BUTTON(GAMEPAD_EXTRA, GAMEPAD_NONE, 0x04) -#define DPAD_RIGHT GAMEPAD_BUTTON(GAMEPAD_TH1, GAMEPAD_NONE, 0x08) -#define BUTTON_MODE GAMEPAD_BUTTON(GAMEPAD_EXTRA, GAMEPAD_NONE, 0x08) -#define BUTTON_A GAMEPAD_BUTTON(GAMEPAD_TH0, GAMEPAD_NONE, 0x10) -#define BUTTON_B GAMEPAD_BUTTON(GAMEPAD_TH1, GAMEPAD_NONE, 0x10) -#define BUTTON_START GAMEPAD_BUTTON(GAMEPAD_TH0, GAMEPAD_NONE, 0x20) -#define BUTTON_C GAMEPAD_BUTTON(GAMEPAD_TH1, GAMEPAD_NONE, 0x20) - -void bind_gamepad(int keycode, int gamepadnum, int button) -{ - - if (gamepadnum < 1 || gamepadnum > 2) { - return; - } - uint8_t bind_type = gamepadnum - 1 + BIND_GAMEPAD1; - bind_key(keycode, bind_type, button >> 12, button >> 8 & 0xF, button & 0xFF); -} - -void bind_button_gamepad(int joystick, int joybutton, int gamepadnum, int padbutton) -{ - if (gamepadnum < 1 || gamepadnum > 2) { - return; - } - uint8_t bind_type = gamepadnum - 1 + BIND_GAMEPAD1; - bind_button(joystick, joybutton, bind_type, padbutton >> 12, padbutton >> 8 & 0xF, padbutton & 0xFF); -} - -void bind_dpad_gamepad(int joystick, int dpad, uint8_t direction, int gamepadnum, int button) -{ - if (gamepadnum < 1 || gamepadnum > 2) { - return; - } - uint8_t bind_type = gamepadnum - 1 + BIND_GAMEPAD1; - bind_dpad(joystick, dpad, direction, bind_type, button >> 12, button >> 8 & 0xF, button & 0xFF); -} - -void bind_ui(int keycode, ui_action action) -{ - bind_key(keycode, BIND_UI, action, 0, 0); -} - -void handle_binding_down(keybinding * binding) -{ - switch(binding->bind_type) - { - case BIND_GAMEPAD1: - if (binding->subtype_a <= GAMEPAD_EXTRA) { - gamepad_1.input[binding->subtype_a] |= binding->value; - } - if (binding->subtype_b <= GAMEPAD_EXTRA) { - gamepad_1.input[binding->subtype_b] |= binding->value; - } - break; - case BIND_GAMEPAD2: - if (binding->subtype_a <= GAMEPAD_EXTRA) { - gamepad_2.input[binding->subtype_a] |= binding->value; - } - if (binding->subtype_b <= GAMEPAD_EXTRA) { - gamepad_2.input[binding->subtype_b] |= binding->value; - } - break; - } -} - -void handle_keydown(int keycode) -{ - int bucket = keycode >> 8 & 0xFF; - if (!bindings[bucket]) { - return; - } - int idx = keycode & 0xFF; - keybinding * binding = bindings[bucket] + idx; - handle_binding_down(binding); -} - -void handle_joydown(int joystick, int button) -{ - if (!joybindings[joystick]) { - return; - } - keybinding * binding = joybindings[joystick] + button; - handle_binding_down(binding); -} - -uint8_t ui_debug_mode = 0; -uint8_t ui_debug_pal = 0; - -void handle_binding_up(keybinding * binding) -{ - switch(binding->bind_type) - { - case BIND_GAMEPAD1: - if (binding->subtype_a <= GAMEPAD_EXTRA) { - gamepad_1.input[binding->subtype_a] &= ~binding->value; - } - if (binding->subtype_b <= GAMEPAD_EXTRA) { - gamepad_1.input[binding->subtype_b] &= ~binding->value; - } - break; - case BIND_GAMEPAD2: - if (binding->subtype_a <= GAMEPAD_EXTRA) { - gamepad_2.input[binding->subtype_a] &= ~binding->value; - } - if (binding->subtype_b <= GAMEPAD_EXTRA) { - gamepad_2.input[binding->subtype_b] &= ~binding->value; - } - break; - case BIND_UI: - switch (binding->subtype_a) - { - case UI_DEBUG_MODE_INC: - ui_debug_mode++; - if (ui_debug_mode == 4) { - ui_debug_mode = 0; - } - render_debug_mode(ui_debug_mode); - break; - case UI_DEBUG_PAL_INC: - ui_debug_pal++; - if (ui_debug_pal == 4) { - ui_debug_pal = 0; - } - render_debug_pal(ui_debug_pal); - break; - case UI_ENTER_DEBUGGER: - break_on_sync = 1; - break; - } - break; - } -} - -void handle_keyup(int keycode) -{ - int bucket = keycode >> 8 & 0xFF; - if (!bindings[bucket]) { - return; - } - int idx = keycode & 0xFF; - keybinding * binding = bindings[bucket] + idx; - handle_binding_up(binding); -} - -void handle_joyup(int joystick, int button) -{ - if (!joybindings[joystick]) { - return; - } - keybinding * binding = joybindings[joystick] + button; - handle_binding_up(binding); -} - -void handle_joy_dpad(int joystick, int dpadnum, uint8_t value) -{ - if (!joydpads[joystick]) { - return; - } - joydpad * dpad = joydpads[joystick] + dpadnum; - uint8_t newdown = (value ^ dpad->state) & value; - uint8_t newup = ((~value) ^ (~dpad->state)) & (~value); - dpad->state = value; - for (int i = 0; i < 4; i++) { - if (newdown & dpadbits[i]) { - handle_binding_down(dpad->bindings + i); - } else if(newup & dpadbits[i]) { - handle_binding_up(dpad->bindings + i); - } - } -} - -void set_keybindings() -{ - bind_gamepad(RENDERKEY_UP, 1, DPAD_UP); - bind_gamepad(RENDERKEY_DOWN, 1, DPAD_DOWN); - bind_gamepad(RENDERKEY_LEFT, 1, DPAD_LEFT); - bind_gamepad(RENDERKEY_RIGHT, 1, DPAD_RIGHT); - bind_gamepad('a', 1, BUTTON_A); - bind_gamepad('s', 1, BUTTON_B); - bind_gamepad('d', 1, BUTTON_C); - bind_gamepad('q', 1, BUTTON_X); - bind_gamepad('w', 1, BUTTON_Y); - bind_gamepad('e', 1, BUTTON_Z); - bind_gamepad('\r', 1, BUTTON_START); - bind_gamepad('f', 1, BUTTON_MODE); - bind_ui('[', UI_DEBUG_MODE_INC); - bind_ui(']', UI_DEBUG_PAL_INC); - bind_ui('u', UI_ENTER_DEBUGGER); - - bind_dpad_gamepad(0, 0, RENDER_DPAD_UP, 2, DPAD_UP); - bind_dpad_gamepad(0, 0, RENDER_DPAD_DOWN, 2, DPAD_DOWN); - bind_dpad_gamepad(0, 0, RENDER_DPAD_LEFT, 2, DPAD_LEFT); - bind_dpad_gamepad(0, 0, RENDER_DPAD_RIGHT, 2, DPAD_RIGHT); - bind_button_gamepad(0, 0, 2, BUTTON_A); - bind_button_gamepad(0, 1, 2, BUTTON_B); - bind_button_gamepad(0, 2, 2, BUTTON_C); - bind_button_gamepad(0, 3, 2, BUTTON_X); - bind_button_gamepad(0, 4, 2, BUTTON_Y); - bind_button_gamepad(0, 5, 2, BUTTON_Z); - bind_button_gamepad(0, 6, 2, BUTTON_START); - bind_button_gamepad(0, 7, 2, BUTTON_MODE); -} - typedef struct bp_def { struct bp_def * next; uint32_t address; @@ -2131,7 +1771,8 @@ init_x86_z80_opts(&z_opts); init_z80_context(&z_context, &z_opts); - genesis_context gen; + genesis_context gen; + memset(&gen, 0, sizeof(gen)); z_context.system = &gen; z_context.mem_pointers[0] = z80_ram;