texture mapping

//Texture coloring

vec2_t tex1, tex2, tex3;
vec2_copy_dest(&tex1, &rt->shape->vertices[0]->texCoord);
vec2_copy_dest(&tex2, &rt->shape->vertices[1]->texCoord);
vec2_copy_dest(&tex3, &rt->shape->vertices[2]->texCoord);

vec2_mul(&tex1, 1.f/rt->pRaster[0]->coords.z);
vec2_mul(&tex2, 1.f/rt->pRaster[1]->coords.z);
vec2_mul(&tex3, 1.f/rt->pRaster[2]->coords.z);

//rt->bc is a vec3_t with barycentric coordinates saved

float texx = rt->bc.coords.x*tex1.coords.x +
			 rt->bc.coords.y*tex2.coords.x +
			 rt->bc.coords.z*tex3.coords.x;
float texy = rt->bc.coords.x*tex1.coords.y +
			 rt->bc.coords.y*tex2.coords.y +
			 rt->bc.coords.z*tex3.coords.y;

//this cuts texture in perspective...may be right should tested
texx = (texx / rt->z)/rt->z;
texy = (texy / rt->z)/rt->z;
//can cause number over 1.08f seems a magic number otherwise we must iterate twice for interpolation

texx = interpolate_lin(texx, 0.f, 0.f, 1.08f, 512.f);
texy = interpolate_lin(texy, 0.f, 0.f, 1.08f, 512.f);

int texIndex = floor(texy) * rt->renderer->imgWidth + floor(texx);
crgb_crgb_copy(&curCol1, &rt->renderer->texture[texIndex]);