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#include "../include/shader.h"
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
static honey_result read_file(char** destination, char* file_path) {
FILE* f = fopen(file_path, "r");
if (f == NULL) {
honey_error_set_string1(file_path);
return HONEY_FILE_READ_ERROR;
}
fseek(f, 0, SEEK_END);
long fsize = ftell(f);
fseek(f, 0, SEEK_SET);
*destination = malloc(fsize + 1);
if (*destination == NULL) {
return HONEY_MEMORY_ALLOCATION_ERROR;
}
fread(*destination, 1, fsize, f);
fclose(f);
(*destination)[fsize] = 0;
return HONEY_OK;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
honey_result honey_shader_load(honey_shader* shader,
char* vertex_shader_path,
char* fragment_shader_path) {
/* load vertex shader code */
char* vertex_shader_code;
honey_result result = read_file(&vertex_shader_code,
vertex_shader_path);
if (result != HONEY_OK)
return result;
/* load fragment shader code */
char* fragment_shader_code;
result = read_file(&fragment_shader_code,
fragment_shader_path);
if (result != HONEY_OK)
return result;
result = honey_shader_new(shader,
vertex_shader_code,
fragment_shader_code);
if (result == HONEY_VERTEX_SHADER_COMPILATION_ERROR)
honey_error_set_string2(vertex_shader_path);
if (result == HONEY_FRAGMENT_SHADER_COMPILATION_ERROR)
honey_error_set_string2(fragment_shader_path);
free(vertex_shader_code);
free(fragment_shader_code);
return result;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
honey_result honey_shader_new(honey_shader* shader,
char* vertex_shader_code,
char* fragment_shader_code) {
/* compile shaders */
int success;
char error[512];
int vertex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex_shader, 1, ((const char**)&vertex_shader_code), NULL);
glCompileShader(vertex_shader);
glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &success);
if (!success) {
honey_error_clear_strings();
char compiler_error[HONEY_ERROR_DATA_STRING_LENGTH];
glGetShaderInfoLog(vertex_shader, HONEY_ERROR_DATA_STRING_LENGTH, NULL, compiler_error);
honey_error_set_string1(compiler_error);
return HONEY_VERTEX_SHADER_COMPILATION_ERROR;
}
int fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment_shader, 1, ((const char**)&fragment_shader_code), NULL);
glCompileShader(fragment_shader);
glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &success);
if (!success) {
honey_error_clear_strings();
char compiler_error[HONEY_ERROR_DATA_STRING_LENGTH];
glGetShaderInfoLog(fragment_shader, HONEY_ERROR_DATA_STRING_LENGTH, NULL, compiler_error);
honey_error_set_string1(compiler_error);
return HONEY_FRAGMENT_SHADER_COMPILATION_ERROR;
}
/* link shaders */
*shader = glCreateProgram();
glAttachShader(*shader, vertex_shader);
glAttachShader(*shader, fragment_shader);
glLinkProgram(*shader);
glGetShaderiv(*shader, GL_LINK_STATUS, &success);
if (!success) {
honey_error_clear_strings();
char compiler_error[HONEY_ERROR_DATA_STRING_LENGTH];
glGetShaderInfoLog(vertex_shader, HONEY_ERROR_DATA_STRING_LENGTH, NULL, compiler_error);
honey_error_set_string1(compiler_error);
return HONEY_SHADER_LINK_ERROR;
}
glDeleteShader(vertex_shader);
glDeleteShader(fragment_shader);
return HONEY_OK;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_shader_set_int(honey_shader shader,
char* int_name,
int value) {
honey_shader_use(shader);
unsigned int int_location = glGetUniformLocation(shader, int_name);
glUniform1i(int_location, value);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_shader_set_float(honey_shader shader,
char* float_name,
float value) {
honey_shader_use(shader);
unsigned int float_location = glGetUniformLocation(shader, float_name);
glUniform1f(float_location, value);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_shader_set_vec3(honey_shader shader,
char* vector_name,
vec3 value) {
honey_shader_use(shader);
unsigned int vector_location = glGetUniformLocation(shader, vector_name);
glUniform3fv(vector_location, 1, (float*) value);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_shader_set_mat3(honey_shader shader,
char* matrix_name,
mat3 value) {
glUseProgram(shader);
unsigned int matrix_location = glGetUniformLocation(shader, matrix_name);
glUniformMatrix3fv(matrix_location, 1, GL_FALSE, (float*) value);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_shader_set_mat4(honey_shader shader,
char* matrix_name,
mat4 value) {
glUseProgram(shader);
unsigned int matrix_location = glGetUniformLocation(shader, matrix_name);
glUniformMatrix4fv(matrix_location, 1, GL_FALSE, (float*) value);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_shader_set_point_light(honey_shader shader,
int point_light_index,
honey_point_light light) {
char name[HONEY_MAX_LIGHT_NAME_LENGTH];
snprintf(name,
HONEY_MAX_LIGHT_NAME_LENGTH,
"point_lights[%d].position",
point_light_index);
honey_shader_set_vec3(shader, name, light.position);
snprintf(name,
HONEY_MAX_LIGHT_NAME_LENGTH,
"point_lights[%d].color",
point_light_index);
honey_shader_set_vec3(shader, name, light.color);
snprintf(name,
HONEY_MAX_LIGHT_NAME_LENGTH,
"point_lights[%d].constant",
point_light_index);
honey_shader_set_float(shader, name, light.constant);
snprintf(name,
HONEY_MAX_LIGHT_NAME_LENGTH,
"point_lights[%d].linear",
point_light_index);
honey_shader_set_float(shader, name, light.linear);
snprintf(name,
HONEY_MAX_LIGHT_NAME_LENGTH,
"point_lights[%d].quadratic",
point_light_index);
honey_shader_set_float(shader, name, light.quadratic);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_shader_set_directional_light(honey_shader shader,
int directional_light_index,
honey_directional_light light) {
char name[HONEY_MAX_LIGHT_NAME_LENGTH];
snprintf(name,
HONEY_MAX_LIGHT_NAME_LENGTH,
"directional_lights[%d].direction",
directional_light_index);
honey_shader_set_vec3(shader, name, light.direction);
snprintf(name,
HONEY_MAX_LIGHT_NAME_LENGTH,
"directional_lights[%d].color",
directional_light_index);
honey_shader_set_vec3(shader, name, light.color);
}
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