void blending(context_t* c, pixel_t* fragment, pixel_t* fb)
{
rescale(fragment->c[0], fragment->s[0], fb->c[0], fb->s[0]);
rescale(fragment->c[1], fragment->s[1], fb->c[1], fb->s[1]);
rescale(fragment->c[2], fragment->s[2], fb->c[2], fb->s[2]);
rescale(fragment->c[3], fragment->s[3], fb->c[3], fb->s[3]);
pixel_t sf, df;
blend_factor(c, &sf, c->state.blend.src, fragment, fb);
blend_factor(c, &df, c->state.blend.dst, fragment, fb);
fragment->c[1] =
gglMulAddx(fragment->c[1], sf.c[1], gglMulx(fb->c[1], df.c[1]));
fragment->c[2] =
gglMulAddx(fragment->c[2], sf.c[2], gglMulx(fb->c[2], df.c[2]));
fragment->c[3] =
gglMulAddx(fragment->c[3], sf.c[3], gglMulx(fb->c[3], df.c[3]));
if (c->state.blend.alpha_separate) {
blend_factor(c, &sf, c->state.blend.src_alpha, fragment, fb);
blend_factor(c, &df, c->state.blend.dst_alpha, fragment, fb);
}
fragment->c[0] =
gglMulAddx(fragment->c[0], sf.c[0], gglMulx(fb->c[0], df.c[0]));
// clamp to 1.0
if (fragment->c[0] >= (1LU<<fragment->s[0]))
fragment->c[0] = (1<<fragment->s[0])-1;
if (fragment->c[1] >= (1LU<<fragment->s[1]))
fragment->c[1] = (1<<fragment->s[1])-1;
if (fragment->c[2] >= (1LU<<fragment->s[2]))
fragment->c[2] = (1<<fragment->s[2])-1;
if (fragment->c[3] >= (1LU<<fragment->s[3]))
fragment->c[3] = (1<<fragment->s[3])-1;
}
static inline
void vmul3(GLfixed* d, const GLfixed* m0, const GLfixed* m1) {
d[0] = gglMulx(m0[0], m1[0]);
d[1] = gglMulx(m0[1], m1[1]);
d[2] = gglMulx(m0[2], m1[2]);
}
static inline
void vscale3(GLfixed* d, const GLfixed* m, GLfixed s) {
d[0] = gglMulx(m[0], s);
d[1] = gglMulx(m[1], s);
d[2] = gglMulx(m[2], s);
}
static GLfixed fog_exp2(ogles_context_t* c, GLfixed z) {
const float e = fixedToFloat(gglMulx(c->fog.density, z));
return clampF(gglFloatToFixed(fastexpf(-e*e)));
}
static GLfixed fog_linear(ogles_context_t* c, GLfixed z) {
return clampF(gglMulx((c->fog.end - ((z<0)?-z:z)), c->fog.invEndMinusStart));
}