diff options
Diffstat (limited to 'src/ppusim/pixel.c')
| -rw-r--r-- | src/ppusim/pixel.c | 77 |
1 files changed, 36 insertions, 41 deletions
diff --git a/src/ppusim/pixel.c b/src/ppusim/pixel.c index 6e915e6..0457d55 100644 --- a/src/ppusim/pixel.c +++ b/src/ppusim/pixel.c @@ -1,10 +1,10 @@ #include <SDL2/SDL.h> #include <stdbool.h> -#include "ppusim/work.h" +#include "ppu/consts.h" #include "ppu/internals.h" #include "ppusim/mem.h" -#include "ppu/consts.h" +#include "ppusim/work.h" /* transform xy if tile is flipped */ static uint16_t hh_ppusim_apply_transform(unsigned x, unsigned y, bool fliph, bool flipv) { @@ -15,25 +15,25 @@ static uint16_t hh_ppusim_apply_transform(unsigned x, unsigned y, bool fliph, bo /* @brief get current bg pixel cidx */ static uint8_t hh_ppusim_bg_pixel(unsigned x, unsigned y) { - hh_ppu_data_t* aux = &g_hh_ppusim_vram[HH_PPU_VRAM_AUX_OFFSET]; - unsigned bg_shift_y = HH_RESIZE(aux[0], 7, 0); - unsigned bg_shift_x = HH_RESIZE(aux[0], 15, 8) | HH_RESIZE(aux[1], 0, 0) << 8; - unsigned abs_x = bg_shift_x + x; - unsigned abs_y = bg_shift_y + y; - unsigned grid_x = abs_x / HH_PPU_SPRITE_WIDTH; - unsigned grid_y = abs_y / HH_PPU_SPRITE_HEIGHT; - unsigned loc_x = abs_x - grid_x * HH_PPU_SPRITE_WIDTH; - unsigned loc_y = abs_y - grid_y * HH_PPU_SPRITE_HEIGHT; - unsigned bam_offset = grid_y * HH_PPU_BG_CANVAS_TILES_H + grid_x; - hh_ppu_data_t bam = g_hh_ppusim_vram[HH_PPU_VRAM_BAM_OFFSET + bam_offset]; - uint8_t cidx = 0; + hh_ppu_data_t *aux = &g_hh_ppusim_vram[HH_PPU_VRAM_AUX_OFFSET]; + unsigned bg_shift_y = HH_RESIZE(aux[0], 7, 0); + unsigned bg_shift_x = HH_RESIZE(aux[0], 15, 8) | HH_RESIZE(aux[1], 0, 0) << 8; + unsigned abs_x = bg_shift_x + x; + unsigned abs_y = bg_shift_y + y; + unsigned grid_x = abs_x / HH_PPU_SPRITE_WIDTH; + unsigned grid_y = abs_y / HH_PPU_SPRITE_HEIGHT; + unsigned loc_x = abs_x - grid_x * HH_PPU_SPRITE_WIDTH; + unsigned loc_y = abs_y - grid_y * HH_PPU_SPRITE_HEIGHT; + unsigned bam_offset = grid_y * HH_PPU_BG_CANVAS_TILES_H + grid_x; + hh_ppu_data_t bam = g_hh_ppusim_vram[HH_PPU_VRAM_BAM_OFFSET + bam_offset]; + uint8_t cidx = 0; uint16_t tile_pixel_idx = hh_ppusim_apply_transform(loc_x, loc_y, HH_RESIZE(bam, 14, 14), HH_RESIZE(bam, 13, 13)); - uint16_t tile_idx = HH_RESIZE(bam, 9, 0); - hh_ppu_addr_t ttm_addr = tile_idx * HH_PPU_VRAM_TMM_SPRITE_SIZE + tile_pixel_idx / 5; - uint8_t word_bit_addr = (tile_pixel_idx % 5) * 3; - hh_ppu_data_t tmm = g_hh_ppusim_vram[HH_PPU_VRAM_TMM_OFFSET + ttm_addr]; + uint16_t tile_idx = HH_RESIZE(bam, 9, 0); + hh_ppu_addr_t ttm_addr = tile_idx * HH_PPU_VRAM_TMM_SPRITE_SIZE + tile_pixel_idx / 5; + uint8_t word_bit_addr = (tile_pixel_idx % 5) * 3; + hh_ppu_data_t tmm = g_hh_ppusim_vram[HH_PPU_VRAM_TMM_OFFSET + ttm_addr]; cidx |= HH_RESIZE(bam, 12, 10) << 3; - cidx |= HH_RESIZE(tmm, word_bit_addr+2, word_bit_addr) << 0; + cidx |= HH_RESIZE(tmm, word_bit_addr + 2, word_bit_addr) << 0; return cidx; } @@ -44,42 +44,37 @@ static uint8_t hh_ppusim_fg_pixel(unsigned x, unsigned y) { uint8_t cidx = 0; for (unsigned i = 0; i < HH_PPU_FG_SPRITE_COUNT; i++) { unsigned fam_offset = i * HH_PPU_VRAM_FAM_ENTRY_SIZE; - hh_ppu_data_t* fam = &g_hh_ppusim_vram[HH_PPU_VRAM_FAM_OFFSET + fam_offset]; - unsigned sprite_y = HH_RESIZE(fam[0], 15, 13) | HH_RESIZE(fam[1], 4, 0) << 3; - unsigned sprite_x = HH_RESIZE(fam[1], 13, 5); + hh_ppu_data_t *fam = &g_hh_ppusim_vram[HH_PPU_VRAM_FAM_OFFSET + fam_offset]; + unsigned sprite_y = HH_RESIZE(fam[0], 15, 13) | HH_RESIZE(fam[1], 4, 0) << 3; + unsigned sprite_x = HH_RESIZE(fam[1], 13, 5); if (x < sprite_x) continue; if (x >= sprite_x + HH_PPU_SPRITE_WIDTH) continue; if (y < sprite_y) continue; if (y >= sprite_y + HH_PPU_SPRITE_HEIGHT) continue; - unsigned loc_x = x - sprite_x; - unsigned loc_y = y - sprite_y; + unsigned loc_x = x - sprite_x; + unsigned loc_y = y - sprite_y; uint16_t tile_pixel_idx = hh_ppusim_apply_transform(loc_x, loc_y, HH_RESIZE(fam[1], 15, 15), HH_RESIZE(fam[1], 14, 14)); - uint16_t tile_idx = HH_RESIZE(fam[0], 9, 0); - hh_ppu_addr_t ttm_addr = tile_idx * HH_PPU_VRAM_TMM_SPRITE_SIZE + tile_pixel_idx / 5; - uint8_t word_bit_addr = (tile_pixel_idx % 5) * 3; - hh_ppu_data_t tmm = g_hh_ppusim_vram[HH_PPU_VRAM_TMM_OFFSET + ttm_addr]; - unsigned cidx_col = HH_RESIZE(tmm, word_bit_addr+2, word_bit_addr); + uint16_t tile_idx = HH_RESIZE(fam[0], 9, 0); + hh_ppu_addr_t ttm_addr = tile_idx * HH_PPU_VRAM_TMM_SPRITE_SIZE + tile_pixel_idx / 5; + uint8_t word_bit_addr = (tile_pixel_idx % 5) * 3; + hh_ppu_data_t tmm = g_hh_ppusim_vram[HH_PPU_VRAM_TMM_OFFSET + ttm_addr]; + unsigned cidx_col = HH_RESIZE(tmm, word_bit_addr + 2, word_bit_addr); if (cidx_col == 0) continue; unsigned cidx_pal = HH_RESIZE(fam[0], 12, 10); - cidx = (cidx_col << 0) | (cidx_pal << 3); + cidx = (cidx_col << 0) | (cidx_pal << 3); break; } return cidx; } -void hh_ppusim_pixel(uint8_t* s, unsigned x, unsigned y) { - uint8_t bg_cidx = hh_ppusim_bg_pixel(x, y); - uint8_t fg_cidx = hh_ppusim_fg_pixel(x, y); - uint8_t cidx = (fg_cidx & HH_MASK(3)) == 0 ? bg_cidx : fg_cidx; - hh_ppu_data_t pal_rgb = g_hh_ppusim_vram[HH_PPU_VRAM_PAL_OFFSET + cidx]; - hh_ppu_rgb_color_t rgb = { - HH_RESIZE(pal_rgb, 11, 8), - HH_RESIZE(pal_rgb, 7, 4), - HH_RESIZE(pal_rgb, 3, 0) - }; +void hh_ppusim_pixel(uint8_t *s, unsigned x, unsigned y) { + uint8_t bg_cidx = hh_ppusim_bg_pixel(x, y); + uint8_t fg_cidx = hh_ppusim_fg_pixel(x, y); + uint8_t cidx = (fg_cidx & HH_MASK(3)) == 0 ? bg_cidx : fg_cidx; + hh_ppu_data_t pal_rgb = g_hh_ppusim_vram[HH_PPU_VRAM_PAL_OFFSET + cidx]; + hh_ppu_rgb_color_t rgb = {HH_RESIZE(pal_rgb, 11, 8), HH_RESIZE(pal_rgb, 7, 4), HH_RESIZE(pal_rgb, 3, 0)}; s[0] = rgb[0] << 4; s[1] = rgb[1] << 4; s[2] = rgb[2] << 4; } - |