70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include "glutil.h"
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GLuint load_shader(GLenum shaderType, const char *src) {
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GLint status = 0, len = 0;
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GLuint shader;
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if (!(shader = glCreateShader(shaderType)))
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return 0;
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glShaderSource(shader, 1, &src, NULL);
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glCompileShader(shader);
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glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
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if (status)
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return shader;
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glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &len);
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if (len) {
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char *msg = (char*)malloc(len);
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if (msg) {
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glGetShaderInfoLog(shader, len, NULL, msg);
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msg[len-1] = 0;
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fprintf(stderr, "error compiling shader:\n%s\n", msg);
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free(msg);
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}
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}
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glDeleteShader(shader);
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return 0;
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}
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GLuint load_program(const char *vert_src, const char *frag_src) {
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GLuint vert, frag, prog;
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GLint status = 0, len = 0;
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if (!(vert = load_shader(GL_VERTEX_SHADER, vert_src)))
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return 0;
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if (!(frag = load_shader(GL_FRAGMENT_SHADER, frag_src)))
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goto fail_frag;
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if (!(prog = glCreateProgram()))
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goto fail_prog;
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glAttachShader(prog, vert);
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glAttachShader(prog, frag);
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glLinkProgram(prog);
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glGetProgramiv(prog, GL_LINK_STATUS, &status);
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if (status)
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return prog;
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glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &len);
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if (len) {
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char *buf = (char*) malloc(len);
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if (buf) {
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glGetProgramInfoLog(prog, len, NULL, buf);
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buf[len-1] = 0;
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fprintf(stderr, "error linking program:\n%s\n", buf);
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free(buf);
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}
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}
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glDeleteProgram(prog);
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fail_prog:
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glDeleteShader(frag);
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fail_frag:
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glDeleteShader(vert);
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return 0;
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}
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