JeVois  1.17
JeVois Smart Embedded Machine Vision Toolkit
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GPUshader.C
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1 // ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
2 //
3 // JeVois Smart Embedded Machine Vision Toolkit - Copyright (C) 2016 by Laurent Itti, the University of Southern
4 // California (USC), and iLab at USC. See http://iLab.usc.edu and http://jevois.org for information about this project.
5 //
6 // This file is part of the JeVois Smart Embedded Machine Vision Toolkit. This program is free software; you can
7 // redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software
8 // Foundation, version 2. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
9 // without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
10 // License for more details. You should have received a copy of the GNU General Public License along with this program;
11 // if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
12 //
13 // Contact information: Laurent Itti - 3641 Watt Way, HNB-07A - Los Angeles, CA 90089-2520 - USA.
14 // Tel: +1 213 740 3527 - itti@pollux.usc.edu - http://iLab.usc.edu - http://jevois.org
15 // ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
16 /*! \file */
17 
18 #include <jevois/GPU/GPUshader.H>
19 
20 // ####################################################################################################
22  itsId(0)
23 { }
24 
25 // ####################################################################################################
27 {
28  if (itsId) glDeleteShader(itsId);
29 }
30 
31 // ####################################################################################################
32 GLuint jevois::GPUshader::id() const
33 { return itsId; }
34 
35 // ####################################################################################################
36 void jevois::GPUshader::load(char const * filename, GLuint type)
37 {
38  if (itsId) { glDeleteShader(itsId); itsId = 0; }
39 
40  // Read the whole file into memory (much faster than using streambuf):
41  FILE * f = fopen(filename, "rb"); if (f == nullptr) PLFATAL("Failed to read file " << filename);
42  fseek(f, 0, SEEK_END);
43  int sz = ftell(f);
44  fseek(f, 0, SEEK_SET);
45  char * src = new GLchar[sz+1];
46  if (fread(src, 1, sz, f) != 1) { fclose(f); LFATAL("Failed to read " << filename); }
47  src[sz] = 0; // null terminate it
48  fclose(f);
49 
50  // Set and compile the shader:
51  try { this->set(filename, src, type); } catch (...) { jevois::warnAndIgnoreException(); }
52 
53  delete [] src;
54 }
55 
56 // ####################################################################################################
57 void jevois::GPUshader::set(char const * name, char const * str, GLuint type)
58 {
59  if (itsId) { glDeleteShader(itsId); itsId = 0; }
60 
61  // Create and compile the shader:
62  GL_CHECK(itsId = glCreateShader(type));
63  GL_CHECK(glShaderSource(itsId, 1, (const GLchar**)&str, 0));
64  GL_CHECK(glCompileShader(itsId));
65 
66  // Compilation check:
67  GLint compiled; glGetShaderiv(itsId, GL_COMPILE_STATUS, &compiled);
68  if (compiled == 0)
69  {
70  GLint loglen = 4096; char log[loglen];
71  glGetShaderInfoLog(itsId, loglen, &loglen, &log[0]); log[loglen] = '\0';
72  glDeleteShader(itsId);
73  LFATAL("Failed to compile shader [" << name << "], Log: " << &log[0]);
74  }
75 
76  LDEBUG("Compiled shader [" << name << ']');
77 }
GPUshader.H
LDEBUG
#define LDEBUG(msg)
Convenience macro for users to print out console or syslog messages, DEBUG level.
Definition: Log.H:160
jevois::GPUshader::set
void set(char const *name, char const *str, GLuint type)
Load a shader from inlined code in a C-string.
Definition: GPUshader.C:57
jevois::GPUshader::id
GLuint id() const
Get the shader's ID.
Definition: GPUshader.C:32
GL_CHECK
#define GL_CHECK(stmt)
Simple macro to check for OpenGL errors.
Definition: OpenGL.H:77
PLFATAL
#define PLFATAL(msg)
Like LDEBUG but appends errno and strerror(errno), to be used when some system call fails.
Definition: Log.H:226
jevois::GPUshader::~GPUshader
~GPUshader()
Destructor.
Definition: GPUshader.C:26
jevois::warnAndIgnoreException
std::string warnAndIgnoreException(std::string const &prefix="")
Convenience function to catch an exception, issue some LERROR (depending on type),...
Definition: Log.C:224
LFATAL
#define LFATAL(msg)
Convenience macro for users to print out console or syslog messages, FATAL level.
Definition: Log.H:217
jevois::GPUshader::GPUshader
GPUshader()
Constructor.
Definition: GPUshader.C:21
jevois::GPUshader::load
void load(char const *filename, GLuint type)
Load a shader from file.
Definition: GPUshader.C:36