mirror of
https://github.com/scratchfoundation/bgfx.git
synced 2024-11-25 00:58:30 -05:00
82 lines
2.3 KiB
Python
82 lines
2.3 KiB
Python
$input v_wpos, v_view, v_normal, v_tangent, v_texcoord0
|
|
|
|
/*
|
|
* Copyright 2011-2012 Branimir Karadzic. All rights reserved.
|
|
* License: http://www.opensource.org/licenses/BSD-2-Clause
|
|
*/
|
|
|
|
#include "../common/common.sh"
|
|
|
|
SAMPLER2D(u_texColor, 0);
|
|
SAMPLER2D(u_texNormal, 1);
|
|
uniform vec4 u_lightPosRadius[4];
|
|
uniform vec4 u_lightRgbInnerR[4];
|
|
|
|
vec2 blinn(vec3 _lightDir, vec3 _normal, vec3 _viewDir)
|
|
{
|
|
float ndotl = dot(_normal, _lightDir);
|
|
vec3 reflected = _lightDir - 2.0*ndotl*_normal; // reflect(_lightDir, _normal);
|
|
float rdotv = dot(reflected, _viewDir);
|
|
return vec2(ndotl, rdotv);
|
|
}
|
|
|
|
float fresnel(float _ndotl, float _bias, float _pow)
|
|
{
|
|
float facing = (1.0 - _ndotl);
|
|
return max(_bias + (1.0 - _bias) * pow(facing, _pow), 0.0);
|
|
}
|
|
|
|
vec4 lit(float _ndotl, float _rdotv, float _m)
|
|
{
|
|
float diff = max(0.0, _ndotl);
|
|
float spec = step(0.0, _ndotl) * max(0.0, _rdotv * _m);
|
|
return vec4(1.0, diff, spec, 1.0);
|
|
}
|
|
|
|
vec4 powRgba(vec4 _rgba, float _pow)
|
|
{
|
|
vec4 result;
|
|
result.xyz = pow(_rgba.xyz, vec3_splat(_pow) );
|
|
result.w = _rgba.w;
|
|
return result;
|
|
}
|
|
|
|
vec4 toLinear(vec4 _rgba)
|
|
{
|
|
return powRgba(_rgba, 2.2);
|
|
}
|
|
|
|
vec4 toGamma(vec4 _rgba)
|
|
{
|
|
return powRgba(_rgba, 1.0/2.2);
|
|
}
|
|
|
|
vec3 calcLight(int _idx, mat3 _tbn, vec3 _wpos, vec3 _normal, vec3 _view)
|
|
{
|
|
vec3 lp = u_lightPosRadius[_idx].xyz - _wpos;
|
|
float attn = 1.0 - smoothstep(u_lightRgbInnerR[_idx].w, 1.0, length(lp) / u_lightPosRadius[_idx].w);
|
|
vec3 lightDir = mul(_tbn, normalize(lp) );
|
|
vec2 bln = blinn(lightDir, _normal, _view);
|
|
vec4 lc = lit(bln.x, bln.y, 1.0);
|
|
vec3 rgb = u_lightRgbInnerR[_idx].xyz*max(0.0, saturate(lc.y) ) * attn;
|
|
return rgb;
|
|
}
|
|
|
|
void main()
|
|
{
|
|
mat3 tbn = mat3(v_tangent, cross(v_normal, v_tangent), v_normal);
|
|
|
|
vec3 normal = normalize(2.0*texture2D(u_texNormal, v_texcoord0).xyz-1.0);
|
|
|
|
vec3 lightColor;
|
|
lightColor = calcLight(0, tbn, v_wpos, normal, v_view);
|
|
lightColor += calcLight(1, tbn, v_wpos, normal, v_view);
|
|
lightColor += calcLight(2, tbn, v_wpos, normal, v_view);
|
|
lightColor += calcLight(3, tbn, v_wpos, normal, v_view);
|
|
|
|
vec4 color = toLinear(texture2D(u_texColor, v_texcoord0) );
|
|
|
|
gl_FragColor.xyz = max(vec3_splat(0.05), lightColor.xyz)*color.xyz;
|
|
gl_FragColor.w = 1.0;
|
|
gl_FragColor = toGamma(gl_FragColor);
|
|
}
|