54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
#include "texture.h"
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#include "arena.h"
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#include <math.h>
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Texture *texture_create_solid_color(Color value, Arena *arena) {
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Texture *result = arena_alloc(arena, sizeof(Texture));
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result->type = TEXTURE_SOLID_COLOR;
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result->solid_color.value = value;
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return result;
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}
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Texture *texture_create_checker(const Texture *odd, const Texture *even,
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double size, Arena *arena) {
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Texture *result = arena_alloc(arena, sizeof(Texture));
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result->type = TEXTURE_CHECKER;
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result->checker.odd = odd;
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result->checker.even = even;
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result->checker.size = size;
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return result;
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}
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Texture *texture_create_checker_solid_color(Color odd, Color even, double size,
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Arena *arena) {
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Texture *odd_texture = texture_create_solid_color(odd, arena);
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Texture *even_texture = texture_create_solid_color(even, arena);
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return texture_create_checker(odd_texture, even_texture, size, arena);
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}
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Color texture_value(const Texture *texture, double u, double v, Point3 p) {
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switch (texture->type) {
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case TEXTURE_SOLID_COLOR:
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return solid_color_value(&texture->solid_color, u, v, p);
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case TEXTURE_CHECKER:
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return checker_value(&texture->checker, u, v, p);
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}
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return (Color){0.0, 0.0, 0.0};
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}
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Color solid_color_value(const SolidColor *solid_color, double u, double v,
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Point3 p) {
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(void)u, (void)v, (void)p;
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return solid_color->value;
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}
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Color checker_value(const CheckerTexture *checker, double u, double v,
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Point3 p) {
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double sines = sin(checker->size * p.x) * sin(checker->size * p.y) *
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sin(checker->size * p.z);
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if (sines < 0.0)
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return texture_value(checker->odd, u, v, p);
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return texture_value(checker->even, u, v, p);
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}
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