80486DX2-66/86Box-fork
1
0
Fork 0
Code Issues Pull Requests Activity

S3 ViRGE fog implementation.

Browse Source
This commit is contained in:
Bad Sector
2021-06-26 05:43:37 +03:00
parent 58da2edce2
commit 150cfbd553
1 changed files with 15 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
src/video/vid_s3_virge.c
View File

@@ -150,6 +150,8 @@ typedef struct s3d_t
uint32_t txs; uint32_t txs;
uint32_t tys; uint32_t tys;
int ty01, ty12, tlr; int ty01, ty12, tlr;
uint8_t fog_r, fog_g, fog_b;
} s3d_t; } s3d_t;
typedef struct virge_t typedef struct virge_t
@@ -347,6 +349,7 @@ enum
CMD_SET_COMMAND_MASK = (15 << 27) CMD_SET_COMMAND_MASK = (15 << 27)
}; };
#define CMD_SET_FE (1 << 17)
#define CMD_SET_ABC_SRC (1 << 18) #define CMD_SET_ABC_SRC (1 << 18)
#define CMD_SET_ABC_ENABLE (1 << 19) #define CMD_SET_ABC_ENABLE (1 << 19)
#define CMD_SET_TWE (1 << 26) #define CMD_SET_TWE (1 << 26)
@@ -1550,6 +1553,11 @@ s3_virge_mmio_write_l(uint32_t addr, uint32_t val, void *p)
s3_virge_bitblt(virge, -1, 0); s3_virge_bitblt(virge, -1, 0);
break; break;
case 0xb0f4: case 0xb4f4:
virge->s3d_tri.fog_b = val & 0xff;
virge->s3d_tri.fog_g = (val >> 8) & 0xff;
virge->s3d_tri.fog_r = (val >> 16) & 0xff;
break;
case 0xb4d4: case 0xb4d4:
virge->s3d_tri.z_base = val & 0x3ffff8; virge->s3d_tri.z_base = val & 0x3ffff8;
break; break;
@@ -2968,6 +2976,13 @@ static void tri(virge_t *virge, s3d_t *s3d_tri, s3d_state_t *state, int yc, int3
dest_pixel(state); dest_pixel(state);
if (s3d_tri->cmd_set & CMD_SET_FE)
{
int a = state->a >> 7;
state->dest_rgba.r = ((state->dest_rgba.r * a) + (s3d_tri->fog_r * (255 - a))) / 255;
state->dest_rgba.g = ((state->dest_rgba.g * a) + (s3d_tri->fog_g * (255 - a))) / 255;
state->dest_rgba.b = ((state->dest_rgba.b * a) + (s3d_tri->fog_b * (255 - a))) / 255;
}
if (s3d_tri->cmd_set & CMD_SET_ABC_ENABLE) if (s3d_tri->cmd_set & CMD_SET_ABC_ENABLE)
{ {
switch (bpp) switch (bpp)