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#define PPU_CTRL_BG_TILE_SELECT 0x10
#define PPU_CTRL_SPRITE_TILE_SELECT 0x08
// Define constants for PPU control and mask bits
#define PPU_CTRL_NMI 0x80
#define PPU_CTRL_SPRITE_HEIGHT 0x20
#define PPU_CTRL_SPRITE_TILE 0x08
#define PPU_CTRL_VRAM_INCREMENT 0x04
#define PPU_MASK_SHOW_BG 0x08
#define PPU_MASK_SHOW_SPRITES 0x10
// Define mirroring modes
#define MIRROR_HORIZONTAL 0
#define MIRROR_VERTICAL 1
#define MIRROR_FOURSCREEN 2
struct ppu_state {
uint16_t bg_shift_pattern_low; // 0
uint16_t bg_shift_pattern_high; // 2
uint16_t bg_shift_attrib_low; // 4
uint16_t bg_shift_attrib_high; // 6
uint16_t scanline; // 8
uint16_t dot; // 10
uint16_t vram_addr; // 12
uint16_t temp_addr; // 14
uint8_t fine_x; // 16
uint8_t bg_next_tile_id; // 17
uint8_t bg_next_tile_attrib; // 18
uint8_t bg_next_tile_lsb; // 19
uint8_t bg_next_tile_msb; // 20
uint8_t oam_addr; // 21
uint8_t oam_data; // 22
uint8_t even_frame; // 23
uint8_t reg_ctrl; // 24
uint8_t reg_mask; // 25
uint8_t reg_status; // 26
uint8_t write_latch; // 27
uint8_t vram_read_buffer; // 28
uint8_t open_bus; // 29
uint8_t sprite_count; // 30
uint8_t overflow_scheduled_dot; // 31
uint8_t palette[32]; // 32
// NOTE(peter): CACHELINE 2
uint8_t secondary_oam[32] __attribute__((aligned(64)));
uint8_t temp_secondary_oam[32];
// NOTE(peter): CACHELINE 3
struct sprite_data {
uint8_t shift_lo;
uint8_t shift_hi;
uint8_t position;
uint8_t priority;
uint8_t palette;
} __attribute__((packed, aligned(64))) sprites[8];
uint8_t input[2]; // 40 - Controller 1 & 2
uint8_t input_latch[2]; // 42 - Latched inputs after strobe
uint8_t input_bit[2]; // 44 - Current bit position being shifted out
uint8_t input_strobe; // 46 - Control bit (0 or 1)
uint8_t frame_ready; // 47
uint8_t sprite_zero_in_range; // 48 - Boolean: is sprite 0 in range (will always be slot 0 if true)
uint8_t sprite_count_next; // 49 - Sprite count for next scanline
// 15 bytes left.
// NOTE(peter): CACHELINE 4
uint8_t oam[256] __attribute__((aligned(64)));
} __attribute__((packed));
struct apu_state {
uint32_t frame_cycle;
uint16_t dmc_current_addr;
uint16_t dmc_bytes_remaining;
uint16_t dmc_sample_timer;
uint8_t mode;
uint8_t irq_inhibit;
uint8_t irq_pending;
uint8_t dmc_irq_enable;
uint8_t dmc_loop_flag;
uint8_t dmc_dma_enabled;
uint8_t dmc_freq_index;
uint8_t dmc_sample_addr;
uint8_t dmc_sample_len;
} __attribute__((packed));
struct cpu_state {
size_t cycles;
uint16_t pc; // Program Counter
uint8_t sp; // Stack Pointer
uint8_t a; // Accumulator
uint8_t x; // X Register
uint8_t y; // Y Register
uint8_t p; // Processor Status Flags (this can be expanded with separate flags if needed)
uint8_t n; // Negative Flag
uint8_t v; // Overflow Flag
// uint8_t b; // Break Flag (Set by BRK instruction) -- does not exist outside the stack
uint8_t d; // Decimal Flag (exists but ignored on NES)
uint8_t i; // Interrupt Disable Flag
uint8_t z; // Zero Flag
uint8_t c; // Carry Flag
// --
uint8_t irq_pending;
uint8_t nmi_pending;
};
struct ines_state {
uint8_t mapper;
uint8_t submapper;
uint8_t mirroring; // 0 = H, 1 = V, 2 = 4-screen
uint32_t prg_size;
uint32_t chr_size;
};
struct nes_state {
struct ppu_state ppu __attribute__((aligned(4096)));
struct mapper_functions mapper_function __attribute__((aligned(64)));
union mapper_data mapper_data __attribute__((aligned(64)));
struct cpu_state cpu __attribute__((aligned(64)));
struct ines_state ines __attribute__((aligned(64)));
struct apu_state apu __attribute__((aligned(64)));
uint8_t ram[RAM_SIZE] __attribute__((aligned(4096)));
uint8_t ciram[CIRAM_SIZE] __attribute__((aligned(4096)));
uint8_t prg_rom[PRG_ROM_SIZE] __attribute__((aligned(4096)));
uint8_t chr_rom[CHR_ROM_SIZE] __attribute__((aligned(4096)));
uint8_t chr_ram[CHR_RAM_SIZE] __attribute__((aligned(4096)));
uint8_t pixels[PIXELS_SIZE] __attribute__((aligned(4096)));
uint8_t sram[SRAM_SIZE] __attribute__((aligned(4096)));
};
__attribute__((aligned(4096))) static uint32_t nes_palette[65] = {
0x585858ff, 0x00237cff, 0x0d1099ff, 0x300092ff, 0x4f006cff, 0x600035ff, 0x5c0500ff, 0x461800ff,
0x272d00ff, 0x093e00ff, 0x004500ff, 0x004106ff, 0x003545ff, 0x000000ff, 0x000000ff, 0x000000ff,
0xa1a1a1ff, 0x0b53d7ff, 0x3337feff, 0x6621f7ff, 0x9515beff, 0xac166eff, 0xa62721ff, 0x864300ff,
0x596200ff, 0x2d7a00ff, 0x0c8500ff, 0x007f2aff, 0x006d85ff, 0x000000ff, 0x000000ff, 0x000000ff,
0xffffffff, 0x51a5feff, 0x8084feff, 0xbc6afeff, 0xf15bfeff, 0xfe5ec4ff, 0xfe7269ff, 0xe19321ff,
0xadb600ff, 0x79d300ff, 0x51df21ff, 0x3ad974ff, 0x39c3dfff, 0x424242ff, 0x000000ff, 0x000000ff,
0xffffffff, 0xb5d9feff, 0xcacafeff, 0xe3befeff, 0xf9b8feff, 0xfebae7ff, 0xfec3bcff, 0xf4d199ff,
0xdee086ff, 0xc6ec87ff, 0xb2f29dff, 0xa7f0c3ff, 0xa8e7f0ff, 0xacacacff, 0x000000ff, 0x000000ff,
0xffffffff // one extra for debug-coloring...
};
struct remake_state {
struct { int32_t x, y, w, h; } viewport;
int32_t mouse_dx;
int32_t mouse_dy;
float contrast;
float saturation;
float brightness;
float tone_data[4];
// OpenGL Objects
GLuint shader_program;
GLuint persistence_program;
// GLuint upscale_program;
GLuint upscale_warp_program;
GLuint bloom_extract_program;
GLuint bloom_blur_program;
GLuint bloom_warp_program;
GLuint bloom_composite_program;
GLuint texture;
GLuint persistence_texture;
GLuint persistence_output_texture;
GLuint crt_output_texture;
GLuint bloom_texture;
GLuint bloom_temp_texture;
GLuint bloom_warped_texture;
GLuint upscaled_source_texture;
GLuint persistence_fbo;
GLuint upscaled_source_fbo;
GLuint crt_fbo;
GLuint bloom_fbo;
GLuint bloom_temp_fbo;
GLuint bloom_warp_fbo;
GLuint vao;
GLuint vbo;
GLuint ebo;
// CRT Shader Uniforms
GLuint uniform_resolution;
GLuint uniform_src_image_size;
GLuint uniform_brightness;
GLuint uniform_tone;
GLuint uniform_crt_emulation;
GLuint uniform_apply_mask;
GLuint uniform_sampler_location;
// Bloom Shader Uniforms
GLuint bloom_uniform_threshold;
GLuint bloom_uniform_sampler;
GLuint blur_uniform_horizontal;
GLuint blur_uniform_sampler;
GLuint composite_uniform_bloom_strength;
GLuint composite_uniform_crt_sampler;
GLuint composite_uniform_bloom_sampler;
// Bloom settings
float bloom_threshold;
float bloom_strength;
uint32_t bloom_width;
uint32_t bloom_height;
// Phosphor persistence
float persistence_decay;
// Rendering & Dynamic Resolution
uint32_t render_width; // The actual remake resolution (e.g., 360)
uint32_t render_height; // The actual remake resolution (e.g., 270)
uint32_t frame_number;
uint8_t running;
uint8_t toggle_crt_emulation;
uint8_t toggle_bloom;
uint8_t fullscreen;
uint8_t viewport_changed; // Flag to signal render thread to recreate FBOs
};
// static struct remake_state state;
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