ErrorShader_Fragment.glsl
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#extension GL_EXT_gpu_shader4 : enable
varying vec3 fragment_normal;
uniform vec3 L0_pos;
uniform vec3 L1_pos;
vec4 HSLtoRGB(vec4 HSL)
{
float H = HSL.x;
float S = HSL.y;
float L = HSL.z;
float temp2;
if(L < 0.5)
temp2 = L*(1.0+S);
else
temp2 = L+S - L*S;
float temp1 = 2.0*L - temp2;
vec3 temp3 = vec3(H+1.0/3.0, H, H-1.0/3.0);
if(temp3.r < 0.0) temp3.r = temp3.r+1.0;
if(temp3.g < 0.0) temp3.g = temp3.g+1.0;
if(temp3.b < 0.0) temp3.b = temp3.b+1.0;
if(temp3.r > 1.0) temp3.r = temp3.r - 1.0;
if(temp3.g > 1.0) temp3.g = temp3.g - 1.0;
if(temp3.b > 1.0) temp3.b = temp3.b - 1.0;
vec4 result;
if(6.0*temp3.r < 1.0) result.r = temp1 +(temp2 - temp1)*6.0*temp3.r;
else if(2.0*temp3.r < 1.0) result.r = temp2;
else if(3.0*temp3.r < 2.0) result.r = temp1+(temp2-temp1)*((2.0/3.0) - temp3.r)*6.0;
else result.r = temp1;
if(6.0*temp3.g < 1.0) result.g = temp1 +(temp2 - temp1)*6.0*temp3.g;
else if(2.0*temp3.g < 1.0) result.g = temp2;
else if(3.0*temp3.g < 2.0) result.g = temp1+(temp2-temp1)*((2.0/3.0) - temp3.g)*6.0;
else result.g = temp1;
if(6.0*temp3.b < 1.0) result.b = temp1 +(temp2 - temp1)*6.0*temp3.b;
else if(2.0*temp3.b < 1.0) result.b = temp2;
else if(3.0*temp3.b < 2.0) result.b = temp1+(temp2-temp1)*((2.0/3.0) - temp3.b)*6.0;
else result.b = temp1;
result.a = 0.0;
return result;
}
float LightIntensity()
{
//vec3 L0_pos = vec3(1.0, 0.0, 0.0);
//vec3 L1_pos = vec3(0.0, 0.0, 1.0);
float L0 = 0.3*max(dot(fragment_normal, L0_pos), 0.0);
float L1 = 0.3*max(dot(fragment_normal, L1_pos), 0.0);
return L0 + L1;
//return 0.5;
}
void main(void)
{
float error = (1.0 - gl_TexCoord[0].x)*(240.0/360.0);
float light = LightIntensity();
//convert from HSL to RGB
vec4 HSL = vec4(error, 1.0, light, 1.0);
vec4 RGB = HSLtoRGB(HSL);
gl_FragColor = vec4(RGB.r, RGB.g, RGB.b, 1.0);
}