add gb.h

2 files changed, 145 insertions, 131 deletions

diff --git a/gb.h b/gb.h
new file mode 100644
index 0000000..6be3a94
--- /dev/null
+++ b/gb.h
@@ -0,0 +1,123 @@
+#ifndef GB_H
+#define GB_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#include <stdint.h>
+
+typedef enum {
+  STATE_RUN,
+  STATE_STOP,
+  STATE_HALT,
+  STATE_INVALID,
+  STATE_NOT_IMPLEMENTED,
+  STATE_LAST,
+} gb_cpu_state_t;
+
+#define GB_BTN_UP     1
+#define GB_BTN_DOWN   (1 << 1)
+#define GB_BTN_LEFT   (1 << 2)
+#define GB_BTN_RIGHT  (1 << 3)
+#define GB_BTN_A      (1 << 4)
+#define GB_BTN_B      (1 << 5)
+#define GB_BTN_SELECT (1 << 6)
+#define GB_BTN_START  (1 << 7)
+
+typedef struct {
+  struct {
+    _Bool in_bios;
+
+    // FIXME: combine these?
+    uint8_t bios[0x100]; // bios (256 bytes)
+    uint8_t ram[0x2000]; // working ram (8k)
+    uint8_t eram[65536]; // external ram (banked, up to 64k)
+    uint8_t vram[0x2000]; // vram (8k)
+    uint8_t oam[0xA0]; // oam (160 bytes)
+    uint8_t zram[0x7F]; // zram (128 bytes)
+
+    // rom (at least 32k)
+    const uint8_t *rom;
+    uint32_t rom_size;
+
+    union {
+      struct {
+        // current rom bank (5 bits); see note about
+        // rom_ram_mode below
+        uint8_t rom_bank;
+
+        // is external ram enabled?
+        _Bool ram_enable;
+
+        // ram bank
+        // rom_ram_mode == 0: high two bits of rom bank
+        // rom_ram_mode == 1: ram bank
+        uint8_t ram_bank;
+
+        // set interpretation of ram_bank
+        _Bool rom_ram_mode;
+      } mbc1;
+
+      struct {
+        // current rom bank (4 bits)
+        uint8_t rom_bank;
+
+        // is eram enabled?
+        _Bool ram_enable;
+      } mbc2;
+    };
+
+    // interrupts
+    // ie: interrupt enable (addr: 0xFFFF)
+    // iv: interrupt vector (addr: 0xFF0F)
+    // (gb-manual, p26)
+    uint8_t ie;
+    uint8_t iv;
+
+    // buttons (addr: 0xFF00)
+    // gb-manual, p23
+    uint8_t p1_mode;
+    uint8_t btns;
+  } mmu;
+
+  struct {
+    uint16_t clock;
+    uint8_t mode,
+            lcdc,
+            stat,
+            scy,
+            scx,
+            wy,
+            wx,
+            bgp,
+            obp0,
+            obp1,
+            line,
+            lyc;
+    uint8_t rgb[3 * 160 * 144];
+    uint32_t frame;
+  } gpu;
+
+  struct {
+    uint16_t div;
+    uint32_t tima; // NOTE: cannot be uint16_t because of 10-bit shift
+    uint8_t tma,
+            tac;
+  } timer;
+
+  struct {
+    uint16_t rs[6 /* RW_LAST */];
+    uint32_t clock; /* FIXME: uint16_t? */
+    gb_cpu_state_t state;
+
+    // interrupt master enable
+    _Bool ime;
+  } cpu;
+} gb_t;
+
+#ifdef __cplusplus
+};
+#endif /* __cplusplus */
+
+#endif /* GB_H */
diff --git a/ops.yaml b/ops.yaml
index 9f33510..f08a64a 100644
--- a/ops.yaml
+++ b/ops.yaml
@@ -7519,6 +7519,7 @@ templates:
   main: |
     #include <stdint.h>
     #include <stdbool.h>
+    #include "gb.h"
 
     #define UNUSED(a) ((void) (a))
 
@@ -7550,127 +7551,16 @@ templates:
       RW_LAST,
     } rw_t;
 
-    typedef enum {
-      STATE_RUN,
-      STATE_STOP,
-      STATE_HALT,
-      STATE_INVALID,
-      STATE_NOT_IMPLEMENTED,
-      STATE_LAST,
-    } gb_cpu_state_t;
-
     // gb-manual, p23
-    typedef enum {
-      P1_MODE_NONE,
-      P1_MODE_P14,
-      P1_MODE_P15,
-    } p1_mode_t;
-
-    #define GB_BTN_UP     1
-    #define GB_BTN_DOWN   (1 << 1)
-    #define GB_BTN_LEFT   (1 << 2)
-    #define GB_BTN_RIGHT  (1 << 3)
-    #define GB_BTN_A      (1 << 4)
-    #define GB_BTN_B      (1 << 5)
-    #define GB_BTN_SELECT (1 << 6)
-    #define GB_BTN_START  (1 << 7)
+    #define P1_MODE_NONE 0
+    #define P1_MODE_P14  1
+    #define P1_MODE_P15  2
 
     #define GPU_MODE_OAM 2
     #define GPU_MODE_VRAM 3
     #define GPU_MODE_HBLANK 0
     #define GPU_MODE_VBLANK 1
 
-    typedef struct {
-      struct {
-        bool in_bios;
-
-        // FIXME: combine these?
-        uint8_t bios[0x100]; // bios (256 bytes)
-        uint8_t ram[0x2000]; // working ram (8k)
-        uint8_t eram[65536]; // external ram (banked, up to 64k)
-        uint8_t vram[0x2000]; // vram (8k)
-        uint8_t oam[0xA0]; // oam (160 bytes)
-        uint8_t zram[0x7F]; // zram (128 bytes)
-
-        // rom (at least 32k)
-        const uint8_t *rom;
-        uint32_t rom_size;
-
-        union {
-          struct {
-            // current rom bank (5 bits); see note about
-            // rom_ram_mode below
-            uint8_t rom_bank;
-
-            // is external ram enabled?
-            bool ram_enable;
-
-            // ram bank
-            // rom_ram_mode == 0: high two bits of rom bank
-            // rom_ram_mode == 1: ram bank
-            uint8_t ram_bank;
-
-            // set interpretation of ram_bank
-            bool rom_ram_mode;
-          } mbc1;
-
-          struct {
-            // current rom bank (4 bits)
-            uint8_t rom_bank;
-
-            // is eram enabled?
-            bool ram_enable;
-          } mbc2;
-        };
-
-        // interrupts
-        // ie: interrupt enable (addr: 0xFFFF)
-        // iv: interrupt vector (addr: 0xFF0F)
-        // (gb-manual, p26)
-        uint8_t ie;
-        uint8_t iv;
-
-        // buttons (addr: 0xFF00)
-        // gb-manual, p23
-        uint8_t p1_mode;
-        uint8_t btns;
-      } mmu;
-
-      struct {
-        uint16_t clock;
-        uint8_t mode,
-                lcdc,
-                stat,
-                scy,
-                scx,
-                wy,
-                wx,
-                bgp,
-                obp0,
-                obp1,
-                line,
-                lyc;
-        uint8_t rgb[3 * 160 * 144];
-        uint32_t frame_num;
-      } gpu;
-
-      struct {
-        uint16_t div;
-        uint32_t tima; // NOTE: cannot be uint16_t because of 10-bit shift
-        uint8_t tma,
-                tac;
-      } timer;
-
-      struct {
-        uint16_t rs[RW_LAST];
-        uint32_t clock; /* FIXME: uint16_t? */
-        gb_cpu_state_t state;
-
-        // interrupt master enable
-        bool ime;
-      } cpu;
-    } gb_t;
-
     #define CART_TYPE_ROM_ONLY                        0x00
     #define CART_TYPE_MBC1                            0x01
     #define CART_TYPE_MBC1_RAM                        0x02
@@ -9625,23 +9515,6 @@ templates:
       }
     }
 
-    void
-    gb_btn_set(
-      gb_t * const ctx,
-      const uint8_t btn,
-      const bool set
-    ) {
-      if (set) {
-        ctx->mmu.btns |= btn;
-      } else {
-        ctx->mmu.btns &= ~btn;
-      }
-
-      // trigger p1 interrupt
-      mmu_wb(ctx, PORT_IF, mmu_rb(ctx, PORT_IF) & (1 << 4));
-      // TODO: handle HALT and STOP
-    }
-
     static void
     cpu_handle_interrupts(
       gb_t * const ctx
@@ -9734,6 +9607,24 @@ templates:
     }
 
     void
+    gb_set_buttons(
+      gb_t * const ctx,
+      const uint8_t btn,
+      const bool set
+    ) {
+      if (set) {
+        // set buttons
+        ctx->mmu.btns |= btn;
+      } else {
+        // clear buttons
+        ctx->mmu.btns &= ~btn;
+      }
+
+      // trigger p1 interrupt
+      mmu_wb(ctx, PORT_IF, mmu_rb(ctx, PORT_IF) & (1 << 4));
+    }
+
+    void
     gb_frame(
       gb_t * const ctx
     ) {