static inline
void vmla3(GLfixed* d,
const GLfixed* m0, const GLfixed* m1, const GLfixed* a)
{
d[0] = gglMulAddx(m0[0], m1[0], a[0]);
d[1] = gglMulAddx(m0[1], m1[1], a[1]);
d[2] = gglMulAddx(m0[2], m1[2], a[2]);
}
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;
}
void lightVertex(ogles_context_t* c, vertex_t* v)
{
// emission and ambient for the whole scene
vec4_t r = c->lighting.implicitSceneEmissionAndAmbient;
uint32_t en = c->lighting.enabledLights;
if (ggl_likely(en)) {
// since we do the lighting in object-space, we don't need to
// transform each normal. However, we might still have to normalize
// it if GL_NORMALIZE is enabled.
vec4_t n;
c->arrays.normal.fetch(c, n.v,
c->arrays.normal.element(v->index & vertex_cache_t::INDEX_MASK));
// TODO: right now we handle GL_RESCALE_NORMALS as if ti were
// GL_NORMALIZE. We could optimize this by scaling mvui
// appropriately instead.
if (c->transforms.rescaleNormals)
vnorm3(n.v, n.v);
const material_t& material = c->lighting.front;
const int twoSide = c->lighting.lightModel.twoSide;
while (en) {
const int i = 31 - gglClz(en);
en &= ~(1<<i);
const light_t& l = c->lighting.lights[i];
vec4_t d, t;
GLfixed s;
GLfixed sqDist = 0x10000;
// compute vertex-to-light vector
if (ggl_unlikely(l.position.w)) {
// lightPos/1.0 - vertex/vertex.w == lightPos*vertex.w - vertex
vss3(d.v, l.objPosition.v, v->obj.w, v->obj.v);
sqDist = dot3(d.v, d.v);
vscale3(d.v, d.v, gglSqrtRecipx(sqDist));
} else {
// TODO: avoid copy here
d = l.normalizedObjPosition;
}
// ambient & diffuse
s = dot3(n.v, d.v);
s = (s<0) ? (twoSide?(-s):0) : s;
vsa3(t.v, l.implicitDiffuse.v, s, l.implicitAmbient.v);
// specular
if (ggl_unlikely(s && l.implicitSpecular.v[3])) {
vec4_t h;
h.x = d.x;
h.y = d.y;
h.z = d.z + 0x10000;
vnorm3(h.v, h.v);
s = dot3(n.v, h.v);
s = (s<0) ? (twoSide?(-s):0) : s;
if (s > 0) {
s = gglPowx(s, material.shininess);
vsa3(t.v, l.implicitSpecular.v, s, t.v);
}
}
// spot
if (ggl_unlikely(l.spotCutoff != gglIntToFixed(180))) {
GLfixed spotAtt = -dot3(l.normalizedSpotDir.v, d.v);
if (spotAtt >= l.spotCutoffCosine) {
vscale3(t.v, t.v, gglPowx(spotAtt, l.spotExp));
}
}
// attenuation
if (ggl_unlikely(l.position.w)) {
if (l.rConstAttenuation) {
s = l.rConstAttenuation;
} else {
s = gglMulAddx(sqDist, l.attenuation[2], l.attenuation[0]);
if (l.attenuation[1])
s = gglMulAddx(gglSqrtx(sqDist), l.attenuation[1], s);
s = gglRecipFast(s);
}
vscale3(t.v, t.v, s);
}
r.r += t.r;
r.g += t.g;
r.b += t.b;
}
}
v->color.r = gglClampx(r.r);
v->color.g = gglClampx(r.g);
v->color.b = gglClampx(r.b);
v->color.a = gglClampx(r.a);
v->flags |= vertex_t::LIT;
}
static inline
void vsa3(GLfixed* d, const GLfixed* m, GLfixed s, const GLfixed* a) {
d[0] = gglMulAddx(m[0], s, a[0]);
d[1] = gglMulAddx(m[1], s, a[1]);
d[2] = gglMulAddx(m[2], s, a[2]);
}
