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annotate src/sdr.cc @ 37:1d935677d3ab

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Created new branch non-qt-version
author Eleni Maria Stea <elene.mst@gmail.com>
date Mon, 17 Apr 2017 13:26:24 +0000
parents 4e120dcd55ec
children
rev   line source
nuclear@35 1 #include "opengl.h"
elene@22 2
elene@22 3 #include <errno.h>
elene@22 4 #include <stdio.h>
elene@22 5 #include <stdlib.h>
elene@22 6 #include <string.h>
elene@22 7
elene@22 8 #include "sdr.h"
elene@22 9
elene@22 10 char* sdr_load(const char* fname)
elene@22 11 {
elene@22 12 if(!fname) {
elene@22 13 return 0;
elene@22 14 }
elene@22 15
elene@22 16 FILE *fp;
elene@22 17 int ctr = 0;
elene@22 18
elene@22 19 if(!(fp = fopen(fname, "rb"))) {
elene@22 20 fprintf(stderr, "Failed to open file %s: %s\n", fname, strerror(errno));
elene@22 21 return 0;
elene@22 22 }
elene@22 23 fseek(fp, 0, SEEK_END);
elene@22 24 ctr = ftell(fp);
elene@22 25 rewind(fp);
elene@22 26
elene@22 27 char *glsl;
elene@22 28 if(!(glsl = (char*) malloc(ctr + 1))) {
elene@22 29 perror("Failed to allocate memory");
elene@22 30 return 0;
elene@22 31 }
elene@22 32 fread(glsl, 1, ctr, fp);
elene@22 33 fclose(fp);
elene@22 34
elene@22 35 glsl[ctr] = 0;
elene@22 36
elene@22 37 return glsl;
elene@22 38 }
elene@22 39
elene@22 40 bool sdr_compile(unsigned int sdr)
elene@22 41 {
elene@22 42 int status, loglen;
elene@22 43 char infolog[512];
elene@22 44
elene@22 45 glCompileShader(sdr);
elene@22 46 glGetShaderiv(sdr, GL_COMPILE_STATUS, &status);
elene@22 47 glGetShaderInfoLog(sdr, sizeof infolog, &loglen, infolog);
elene@22 48 if(status == GL_FALSE) {
elene@22 49 fprintf(stderr, "Failed to compile shader: %s\n", infolog);
elene@22 50 return false;
elene@22 51 } else if(loglen) {
elene@22 52 fprintf(stderr, "%s\n", infolog);
elene@22 53 }
elene@22 54 return true;
elene@22 55 }
elene@22 56
elene@22 57 unsigned int sdr_getprog(const char* vfname, const char* ffname)
elene@22 58 {
elene@22 59 char *vsdr_glsl = NULL;
elene@22 60 char *fsdr_glsl = NULL;
elene@22 61
elene@22 62 GLuint vsdr; GLuint fsdr;
elene@22 63 vsdr = glCreateShader(GL_VERTEX_SHADER);
elene@22 64 fsdr = glCreateShader(GL_FRAGMENT_SHADER);
elene@22 65
elene@22 66 if(!(vsdr_glsl = sdr_load(vfname)))
elene@22 67 return 0;
elene@22 68 if(!(fsdr_glsl = sdr_load(ffname)))
elene@22 69 return 0;
elene@22 70
elene@22 71 glShaderSource(vsdr, 1, (const GLchar**)&vsdr_glsl, NULL);
elene@22 72 glShaderSource(fsdr, 1, (const GLchar**)&fsdr_glsl, NULL);
elene@22 73
elene@22 74 free(vsdr_glsl);
elene@22 75 free(fsdr_glsl);
elene@22 76
elene@22 77 if(!sdr_compile(vsdr)) {
elene@22 78 fprintf(stderr, "Shader %s failed to compile.\n", vfname);
elene@22 79 return 0;
elene@22 80 }
elene@22 81 if(!sdr_compile(fsdr)) {
elene@22 82 fprintf(stderr, "Shader %s failed to compile.\n", ffname);
elene@22 83 return 0;
elene@22 84 }
elene@22 85
elene@22 86 unsigned int sprog;
elene@22 87 int status, loglen;
elene@22 88 char infolog[512];
elene@22 89
elene@22 90 sprog = glCreateProgram();
elene@22 91 glAttachShader(sprog, vsdr);
elene@22 92 glAttachShader(sprog, fsdr);
elene@22 93 glLinkProgram(sprog);
elene@22 94 glGetProgramiv(sprog, GL_LINK_STATUS, &status);
elene@22 95 glGetProgramInfoLog(sprog, sizeof infolog, &loglen, infolog);
elene@22 96 if(status == GL_FALSE) {
elene@22 97 fprintf(stderr, "Error while linking shader program:\n%s\n", infolog);
elene@22 98 return 0;
elene@22 99 } else if(loglen) {
elene@22 100 fprintf(stderr, "%s\n", infolog);
elene@22 101 }
elene@22 102 return sprog;
elene@22 103 }