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Add attenuated point lights

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This commit is contained in:
Magnus Norddahl 2017-01-02 06:52:50 +01:00
commit c61e9c7fe2
9 changed files with 80 additions and 14 deletions
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17
tools/drawergen/fixedfunction/drawspancodegen.cpp
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@ -248,7 +248,7 @@ SSAVec4i DrawSpanCodegen::Shade(SSAVec4i fg, bool isSimpleShade)
SSAVec4i light_color = SSAUBytePtr(SSAValue(dynlights[light_index][0]).v).load_vec4ub(true);
SSAFloat light_x = dynlights[light_index][1].load(true);
SSAFloat light_y = dynlights[light_index][2].load(true);
//SSAFloat light_z = dynlights[light_index][3].load(true);
SSAFloat light_z = dynlights[light_index][3].load(true);
SSAFloat light_rcp_radius = dynlights[light_index][4].load(true);
// L = light-pos
@ -256,8 +256,19 @@ SSAVec4i DrawSpanCodegen::Shade(SSAVec4i fg, bool isSimpleShade)
// attenuation = 1 - MIN(dist * (1/radius), 1)
SSAFloat Lyz2 = light_y; // L.y*L.y + L.z*L.z
SSAFloat Lx = light_x - viewpos_x;
SSAFloat dist = SSAFloat::fastsqrt(Lyz2 + Lx * Lx);
SSAInt attenuation = SSAInt(SSAFloat(256.0f) - SSAFloat::MIN(dist * light_rcp_radius, SSAFloat(256.0f)), true);
SSAFloat dist2 = Lyz2 + Lx * Lx;
SSAFloat rcp_dist = SSAFloat::rsqrt(dist2);
SSAFloat dist = dist2 * rcp_dist;
SSAFloat distance_attenuation = SSAFloat(256.0f) - SSAFloat::MIN(dist * light_rcp_radius, SSAFloat(256.0f));
// The simple light type
SSAFloat simple_attenuation = distance_attenuation;
// The point light type
// diffuse = dot(N,L) * attenuation
SSAFloat point_attenuation = light_z * rcp_dist * distance_attenuation;
SSAInt attenuation = SSAInt((light_z == SSAFloat(0.0f)).select(simple_attenuation, point_attenuation), true);
SSAVec4i contribution = (light_color * fg * attenuation) >> 16;
stack_lit_color.store(lit_color + contribution);