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Cleanup lighting code a bit

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This commit is contained in:
Luke Benstead 2018-08-04 19:34:07 +01:00
parent 59002546e6
commit db0d39d487
2 changed files with 25 additions and 12 deletions
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36
GL/lighting.c
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@ -47,6 +47,8 @@ void initLights() {
LIGHTS[i].constant_attenuation = 1.0f;
LIGHTS[i].linear_attenuation = 0.0f;
LIGHTS[i].quadratic_attenuation = 0.0f;
LIGHTS[i].is_directional = GL_FALSE;
}
}
@ -109,6 +111,8 @@ void APIENTRY glLightfv(GLenum light, GLenum pname, const GLfloat *params) {
_matrixLoadModelView();
memcpy(LIGHTS[idx].position, params, sizeof(GLfloat) * 4);
LIGHTS[idx].is_directional = (params[3] == 0.0f) ? GL_TRUE : GL_FALSE;
mat_trans_single4(
LIGHTS[idx].position[0],
LIGHTS[idx].position[1],
@ -269,26 +273,34 @@ void calculateLightingContribution(const GLint light, const GLfloat* pos, const
vec3f_normalize(V.x, V.y, V.z);
GLfloat NdotL;
GLfloat NdotL, VdotN;
vec3f_dot(N.x, N.y, N.z, L.x, L.y, L.z, NdotL);
GLfloat f = (NdotL < 0) ? 0 : 1;
GLfloat VdotN;
vec3f_dot(V.x, V.y, V.z, N.x, N.y, N.z, VdotN);
GLfloat VdotR = VdotN - NdotL;
GLfloat specularPower = FPOW(VdotR > 0 ? VdotR : 0, MATERIAL.exponent);
GLfloat att = (l->position[3] == 0.0f) ? 1.0f : (
1.0f / (l->constant_attenuation + (l->linear_attenuation * d) + (l->quadratic_attenuation * d * d))
);
colour[0] = att * (l->ambient[0] * MATERIAL.ambient[0] + f * (l->diffuse[0] * MATERIAL.diffuse[0] * NdotL + l->specular[0] * MATERIAL.specular[0] * specularPower));
colour[1] = att * (l->ambient[1] * MATERIAL.ambient[1] + f * (l->diffuse[1] * MATERIAL.diffuse[1] * NdotL + l->specular[1] * MATERIAL.specular[1] * specularPower));
colour[2] = att * (l->ambient[2] * MATERIAL.ambient[2] + f * (l->diffuse[2] * MATERIAL.diffuse[2] * NdotL + l->specular[2] * MATERIAL.specular[2] * specularPower));
colour[0] = l->ambient[0] * MATERIAL.ambient[0];
colour[1] = l->ambient[1] * MATERIAL.ambient[1];
colour[2] = l->ambient[2] * MATERIAL.ambient[2];
colour[3] = MATERIAL.diffuse[3];
if(NdotL >= 0) {
colour[0] += (l->diffuse[0] * MATERIAL.diffuse[0] * NdotL + l->specular[0] * MATERIAL.specular[0] * specularPower);
colour[1] += (l->diffuse[1] * MATERIAL.diffuse[1] * NdotL + l->specular[1] * MATERIAL.specular[1] * specularPower);
colour[2] += (l->diffuse[2] * MATERIAL.diffuse[2] * NdotL + l->specular[2] * MATERIAL.specular[2] * specularPower);
}
if(!l->is_directional) {
GLfloat att = (
1.0f / (l->constant_attenuation + (l->linear_attenuation * d) + (l->quadratic_attenuation * d * d))
);
colour[0] *= att;
colour[1] *= att;
colour[2] *= att;
}
if(colour[0] > 1.0f) colour[0] = 1.0f;
if(colour[1] > 1.0f) colour[1] = 1.0f;
if(colour[2] > 1.0f) colour[2] = 1.0f;

1
GL/private.h
View File

@ -59,6 +59,7 @@ typedef struct {
GLfloat diffuse[4];
GLfloat specular[4];
GLfloat ambient[4];
GLboolean is_directional;
} LightSource;