glshader.cc

   1 /*
   2     Copyright 2012 Marten Richter
   3
   4     This file is part of VOMP.
   5
   6     VOMP is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     VOMP is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with VOMP; if not, write to the Free Software
  18     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19 */
  20 #include "glshader.h"
  21
  22 GLShader::GLShader(const char* name)
  23 {
  24         initted=0;
  25         objname=name;
  26 }
  27
  28 GLShader::~GLShader()
  29 {
  30         if (initted) {
  31                 deinitShaders();
  32         }
  33
  34
  35
  36 }
  37
  38 int GLShader::initShaders(const char * vertex_shad,const char *fragment_shad)
  39 {
  40           vertex_shader=CreateShader(vertex_shad, GL_VERTEX_SHADER);
  41           frag_shader=CreateShader(fragment_shad, GL_FRAGMENT_SHADER);
  42
  43           // Create the program for osd rendering
  44           shad_program=glCreateProgram();
  45           if (shad_program==0) {
  46                   Log::getInstance()->log("GLShader", Log::WARN, "%s: Creating glsl program failed!%d",objname,glGetError());
  47               return 0;
  48           }
  49           glAttachShader(shad_program,vertex_shader);
  50           glAttachShader(shad_program,frag_shader);
  51           if (!BindAttributes()) {
  52                   return 0;
  53           }
  54           glLinkProgram(shad_program);
  55
  56
  57           GLint link_status;
  58           glGetProgramiv(shad_program,GL_LINK_STATUS, &link_status);
  59
  60           if (!link_status) {
  61                   char buffer[1024];
  62                   glGetProgramInfoLog(shad_program,1024,NULL,buffer);
  63                   Log::getInstance()->log("GLShader", Log::WARN, "%s: Compiling Programm failed!",objname);
  64                   Log::getInstance()->log("GLShader", Log::WARN, "%s",buffer);
  65                   glDeleteProgram(shad_program);
  66                   return 0;
  67           }
  68
  69 }
  70
  71 GLuint GLShader::CreateShader(const GLchar * source, GLenum type)
  72 {
  73         GLuint ret_shad=0;
  74
  75         ret_shad=glCreateShader(type);
  76         if (ret_shad==0 ) {
  77                 Log::getInstance()->log("GLShader", Log::WARN, "%s: Creating Shader failed! %d",objname, glGetError());
  78                 return 0;
  79         }
  80         glShaderSource(ret_shad,1,&source,NULL);
  81         glCompileShader(ret_shad);
  82         GLint comp_status;
  83         glGetShaderiv(ret_shad,GL_COMPILE_STATUS, &comp_status);
  84
  85         if (!comp_status) {
  86                 char buffer[1024];
  87                 Log::getInstance()->log("GLShader", Log::WARN, "%s: Compiling Shader failed!",objname);
  88                 glGetShaderInfoLog(ret_shad,1024,NULL,buffer);
  89                 Log::getInstance()->log("GLShader", Log::WARN, "%s: %s",objname,buffer);
  90                 glDeleteShader(ret_shad);
  91                 return 0;
  92         }
  93         return ret_shad;
  94 }
  95
  96 int GLShader::deinitShaders()
  97 {
  98          if (frag_shader!=0) glDeleteShader(frag_shader);
  99          frag_shader=0;
 100          if (vertex_shader!=0) glDeleteShader(vertex_shader);
 101          vertex_shader=0;
 102          if (shad_program!=0) glDeleteProgram(shad_program);
 103          shad_program=0;
 104          initted=0;
 105          return 0;
 106 }
 107