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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* texture.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/05/11 14:27:34 by charles #+# #+# */
/* Updated: 2020/05/14 19:22:20 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "scop.h"
typedef struct __attribute__((__packed__))
{
uint8_t signature[2];
uint32_t file_size;
uint32_t reserved;
uint32_t img_data_offset;
} t_bmp_file_header;
typedef struct __attribute__((__packed__))
{
uint32_t header_size;
uint32_t width;
uint32_t height;
uint16_t color_planes;
uint16_t depth;
uint32_t compression;
uint32_t image_size;
uint32_t horizontal_res;
uint32_t vertical_res;
uint32_t color_table_len;
uint32_t color_count;
} t_bmp_info_header;
uint8_t *st_read_bmp(char *filepath, size_t *width, size_t *height)
{
uint8_t *data;
t_bmp_file_header file_header;
t_bmp_info_header info_header;
int fd;
fd = open(filepath, O_RDONLY);
read(fd, &file_header, sizeof(t_bmp_file_header));
if (file_header.signature[0] != 'B' || file_header.signature[1] != 'M')
{
close(fd);
return (NULL);
}
read(fd, &info_header, sizeof(t_bmp_info_header));
if ((data = malloc(info_header.image_size)) == NULL)
{
close(fd);
return (NULL);
}
*width = info_header.width;
*height = info_header.height;
read(fd, data, info_header.image_size); // padding
close(fd);
return (data);
}
unsigned int texture_create(char *filepath)
{
uint8_t *data;
unsigned int texture;
size_t width;
size_t height;
if ((data = st_read_bmp(filepath, &width, &height)) == NULL)
return (0);
GL_CALL(glGenTextures(1, &texture));
GL_CALL(glBindTexture(GL_TEXTURE_2D, texture));
GL_CALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
GL_CALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
GL_CALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT));
GL_CALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT));
GL_CALL(glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_BGR, GL_UNSIGNED_BYTE, data));
GL_CALL(glGenerateMipmap(GL_TEXTURE_2D));
free(data);
return (texture);
}
/*
** https://www.wikiwand.com/en/UV_mapping#/Finding_UV_on_a_sphere
*/
void texture_coord_init(float *vertices, size_t vertices_num)
{
t_ftmvec3 v;
size_t i;
i = 0;
while (i < vertices_num)
{
v.x = vertices[i + 0];
v.y = vertices[i + 1];
v.z = vertices[i + 2];
ftm_vec3normalize(&v);
vertices[i + VERTEX_TEX_COORD_OFFSET + 0] = 15.0 * (0.5 + atan2(v.z, v.x) / M_PI * 0.5);
vertices[i + VERTEX_TEX_COORD_OFFSET + 1] = 15.0 * (v.y / 10.0);
i += VERTEX_COUNT;
}
}
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