glshader.cc

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