58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
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#include "./shader.h"
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#include <assert.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <GL/glew.h>
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#include "util/math/algorithm.h"
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gleasy_shader_t gleasy_shader_new(
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GLenum type,
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const char* header, size_t header_len,
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const char* src, size_t src_len) {
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assert(header != NULL || header_len == 0);
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assert(src != NULL || src_len == 0);
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const GLuint shader = glCreateShader(type);
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if (shader == 0) {
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fprintf(stderr, "failed to create shader\n");
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abort();
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}
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const GLchar* srcs[] = { header, src, };
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const GLint lens[] = { header_len, src_len, };
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const size_t offset = (header_len == 0? 1: 0);
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glShaderSource(shader, 2-offset, srcs+offset, lens+offset);
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glCompileShader(shader);
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GLint ok;
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glGetShaderiv(shader, GL_COMPILE_STATUS, &ok);
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if (ok == GL_FALSE) {
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char log[1024];
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const int loglen =
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gleasy_shader_get_log(shader, log, sizeof(log)/sizeof(log[0]));
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fprintf(stderr, "failed to compile shader\n%.*s\n", loglen, log);
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abort();
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}
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return shader;
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}
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size_t gleasy_shader_get_log(
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gleasy_shader_t shader, char* dst, size_t maxlen) {
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assert(shader != 0);
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GLint len;
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glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &len);
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if (dst == NULL) return len;
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len = MATH_MIN(len, (GLint) maxlen);
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if (len == 0) return 0;
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glGetShaderInfoLog(shader, len, &len, (GLchar*) dst);
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return len;
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}
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