113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* rt_get_pixel_color.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: scebula <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2017/01/08 12:47:45 by scebula #+# #+# */
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/* Updated: 2017/01/08 12:57:33 by scebula ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "rt.h"
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#include <math.h>
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double get_solid_tex_y(double hit)
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{
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double decimal;
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hit += 1;
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hit /= 2;
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decimal = fmod(hit, 1);
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if (decimal < 0)
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decimal = 1 + decimal;
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return (decimal);
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}
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t_color texmodifier(double pos[2], t_texture *tex, t_color c, char alt)
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{
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if (tex != NULL)
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c = img_pull_pixel(pos[0] *
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tex->img.x, pos[1] * tex->img.y, &tex->img);
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if (alt == SINX)
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c = set_color(c.r * sin(pos[0] * M_PI), c.g
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* sin(pos[0] * M_PI), c.b * sin(pos[0] * M_PI));
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else if (alt == SINY)
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c = set_color(c.r * sin(pos[1] * M_PI), c.g
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* sin(pos[1] * M_PI), c.b * sin(pos[1] * M_PI));
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else if (alt == SINXY)
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c = set_color(c.r * sin(pos[1] * M_PI) *
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sin(pos[0] * M_PI), c.g * sin(pos[1] * M_PI) *
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sin(pos[0] * M_PI), c.b * sin(pos[1] * M_PI) *
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sin(pos[0] * M_PI));
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else if (alt == QUAD)
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c = ((pos[0] > 0.5 && pos[1] > 0.5) || (pos[0] <
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0.5 && pos[1] < 0.5)) ? set_color(0, 0, 0) : c;
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return (c);
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}
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int solid_texturemode(int type)
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{
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return (type == SPHERE || type == CYLINDER || type == CONE ||
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type == HYPERBOLOID || type == PARABOLOID);
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}
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void bumpmap_normal(double x, double y, t_record *info)
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{
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t_vect result;
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t_texture *tex;
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double res[5];
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if ((tex = bumpmapgetter(info->obj->type, info->obj)) == NULL)
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return ;
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res[0] = GET_COLOR_MOY(x * tex->img.x, y * tex->img.y + 1);
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res[1] = GET_COLOR_MOY(x * tex->img.x - 1, y * tex->img.y);
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res[2] = GET_COLOR_MOY(x * tex->img.x, y * tex->img.y);
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res[3] = GET_COLOR_MOY(x * tex->img.x, y * tex->img.y - 1);
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res[4] = GET_COLOR_MOY(x * tex->img.x + 1, y * tex->img.y);
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result.y = res[2];
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result.z = res[0] - res[3];
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result.x = res[4] - res[1];
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if (result.x == 0 && result.y == 0 && result.z == 0)
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return ;
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info->oldnorm = info->normal;
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normalize_vector(&result);
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if (info->obj->type == PLANE)
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info->normal = result;
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else if (!(result.x == 0 && result.y == 1 && result.z == 0))
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if (solid_texturemode(info->obj->type))
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info->normal = get_bumped_vect(info->normal, result);
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if (dot_product_vector(info->normal, info->oldnorm) < 0)
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info->normal = info->oldnorm;
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}
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t_color get_pixel_color(t_data *d, t_record *info, int type)
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{
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t_vect hitpos;
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t_texture *tex;
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double pos[2];
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hitpos = info->n_pos;
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apply_inverse_tf(info->obj, &hitpos, d);
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if (solid_texturemode(type))
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{
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pos[0] = ((atan2(hitpos.x, hitpos.z) + M_PI) / (2 * M_PI));
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pos[1] = get_solid_tex_y(hitpos.y);
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}
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else if (type == PLANE)
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{
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pos[0] = get_solid_tex_y(hitpos.z);
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pos[1] = get_solid_tex_y(hitpos.x);
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}
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else
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return (info->color);
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pos[0] = texoffx(type, info->obj, texscalex(type, info->obj, pos[0]));
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pos[1] = texoffy(type, info->obj, texscaley(type, info->obj, pos[1]));
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tex = texturegetter(info->obj->type, info->obj);
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info->color = texmodifier(pos, tex, info->color,
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texmodifiergetter(info->obj->type, info->obj));
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bumpmap_normal(pos[0], pos[1], info);
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return (info->color);
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}
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