static void lightx(GLenum i, GLenum pname, GLfixed param, ogles_context_t* c)
{
if (ggl_unlikely(uint32_t(i-GL_LIGHT0) >= OGLES_MAX_LIGHTS)) {
ogles_error(c, GL_INVALID_ENUM);
return;
}
light_t& light = c->lighting.lights[i-GL_LIGHT0];
const GLfixed kDegToRad = GLfixed((M_PI * gglIntToFixed(1)) / 180.0f);
switch (pname) {
case GL_SPOT_EXPONENT:
if (GGLfixed(param) >= gglIntToFixed(128)) {
ogles_error(c, GL_INVALID_VALUE);
return;
}
light.spotExp = param;
break;
case GL_SPOT_CUTOFF:
if (param!=gglIntToFixed(180) && GGLfixed(param)>=gglIntToFixed(90)) {
ogles_error(c, GL_INVALID_VALUE);
return;
}
light.spotCutoff = param;
light.spotCutoffCosine =
gglFloatToFixed(cosinef((M_PI/(180.0f*65536.0f))*param));
break;
case GL_CONSTANT_ATTENUATION:
if (param < 0) {
ogles_error(c, GL_INVALID_VALUE);
return;
}
light.attenuation[0] = param;
break;
case GL_LINEAR_ATTENUATION:
if (param < 0) {
ogles_error(c, GL_INVALID_VALUE);
return;
}
light.attenuation[1] = param;
break;
case GL_QUADRATIC_ATTENUATION:
if (param < 0) {
ogles_error(c, GL_INVALID_VALUE);
return;
}
light.attenuation[2] = param;
break;
default:
ogles_error(c, GL_INVALID_ENUM);
return;
}
invalidate_lighting(c);
}
void ggl_rasterPos2i(void* con, GGLint x, GGLint y)
{
ggl_rasterPos2x(con, gglIntToFixed(x), gglIntToFixed(y));
}
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;
}