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#include <revolution/gf.h>
#include <revolution/gd.h>
void GFSetFog(GXFogType type, f32 startz, f32 endz, f32 nearz, f32 farz, GXColor color) {
f32 A;
f32 B;
f32 B_mant;
f32 C;
f32 A_f;
u32 b_expn;
u32 b_m;
u32 a_hex;
u32 c_hex;
ASSERTMSGLINE(62, farz >= 0.0f, "GFSetFog: The farz should be positive value");
ASSERTMSGLINE(63, farz >= nearz, "GFSetFog: The farz should be larger than nearz");
if (farz == nearz || endz == startz) {
A = 0.0f;
B = 0.5f;
C = 0.0f;
} else {
A = (farz * nearz) / ((farz - nearz) * (endz - startz));
B = farz / (farz - nearz);
C = startz / (endz - startz);
}
B_mant = B;
b_expn = 1;
while (B_mant > 1.0) {
B_mant *= 0.5f;
b_expn++;
}
while (B_mant > 0.0f && B_mant < 0.5) {
B_mant *= 2.0f;
b_expn--;
}
A_f = A / (1 << b_expn);
b_m = (u32) (8388638.0f * B_mant);
a_hex = *(u32*)&A_f;
c_hex = *(u32*)&C;
GFWriteBPCmd(BP_FOG_UNK0(a_hex >> 12, 0xEE));
GFWriteBPCmd(BP_FOG_UNK1(b_m, 0xEF));
GFWriteBPCmd(BP_FOG_UNK2(b_expn, 0xF0));
GFWriteBPCmd(BP_FOG_UNK3(c_hex >> 12, 0, type, 0xF1));
GFWriteBPCmd(BP_FOG_COLOR(color.r, color.g, color.b, 0xF2));
}
void GFSetBlendModeEtc(GXBlendMode type, GXBlendFactor src_factor,
GXBlendFactor dst_factor, GXLogicOp logic_op,
u8 color_update_enable, u8 alpha_update_enable,
u8 dither_enable) {
GFWriteBPCmd(BP_BLEND_MODE(
type == GX_BM_BLEND || type == GX_BM_SUBTRACT,
type == GX_BM_LOGIC,
dither_enable,
color_update_enable,
alpha_update_enable,
dst_factor,
src_factor,
type == GX_BM_SUBTRACT,
logic_op,
0x41
));
}
void GFSetZMode(u8 compare_enable, GXCompare func, u8 update_enable) {
GFWriteBPCmd(BP_Z_MODE(compare_enable, func, update_enable, 0x40));
}
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