83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
#ifndef GFX_H
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#define GFX_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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enum
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{
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SCREEN_X = 368,
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SCREEN_Y = 240
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};
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/* 0-3 Texture page X Base (N*64) (ie. in 64-halfword steps) ;GPUSTAT.0-3
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4 Texture page Y Base (N*256) (ie. 0 or 256) ;GPUSTAT.4
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5-6 Semi Transparency (0=B/2+F/2, 1=B+F, 2=B-F, 3=B+F/4) ;GPUSTAT.5-6
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7-8 Texture page colors (0=4bit, 1=8bit, 2=15bit, 3=Reserved);GPUSTAT.7-8
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9 Dither 24bit to 15bit (0=Off/strip LSBs, 1=Dither Enabled) ;GPUSTAT.9
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10 Drawing to display area (0=Prohibited, 1=Allowed) ;GPUSTAT.10
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11 Texture Disable (0=Normal, 1=Disable if GP1(09h).Bit0=1) ;GPUSTAT.15
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(Above might be chipselect for (absent) second VRAM chip?)
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12 Textured Rectangle X-Flip (BIOS does set this bit on power-up...?)
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13 Textured Rectangle Y-Flip (BIOS does set it equal to GPUSTAT.13...?)
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14-23 Not used (should be 0)
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24-31 Command (E1h)*/
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union gfx_common
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{
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struct
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{
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uint32_t tpagex :4;
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uint32_t tpagey :1;
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uint32_t stp :2;
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uint32_t bpp :2;
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uint32_t dither :1;
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uint32_t draw_to_disp :1;
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uint32_t disable :1;
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uint32_t xflip :1;
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uint32_t yflip :1;
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uint32_t :10;
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uint8_t cmd;
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};
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uint32_t mask;
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};
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union gfx_sznext
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{
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struct
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{
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uint32_t next :24;
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uint32_t sz :8;
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};
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uint32_t cmd_next;
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};
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struct gfx_sprite
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{
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union gfx_sznext sznext;
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union gfx_common common;
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uint8_t r, g, b;
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uint8_t cmd;
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uint16_t x, y;
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uint16_t clutid;
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uint8_t u, v;
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uint16_t w, h;
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};
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int gfx_init(void);
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void gfx_draw(void);
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void gfx_sprite_init(struct gfx_sprite *s);
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void gfx_sprite_sort(struct gfx_sprite *s);
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int gfx_sprite_from_file(const char *path, struct gfx_sprite *s);
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#ifdef __cplusplus
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}
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#endif
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#endif /* GFX_H */
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