src/shaderprogram.cpp

   1 #include "shaderprogram.h"
   2 #include "log.h"
   3
   4 using namespace IPDF;
   5
   6 ShaderProgram::~ShaderProgram()
   7 {
   8         for(auto shader : m_shaders)
   9         {
  10                 glDetachShader(m_program, shader.obj);
  11                 glDeleteShader(shader.obj);
  12         }
  13
  14         if (m_program)
  15                 glDeleteProgram(m_program);
  16 }
  17
  18 void ShaderProgram::LazyCreateProgram()
  19 {
  20         if (!m_program)
  21         {
  22                 m_program = glCreateProgram();
  23         }
  24 }
  25
  26 bool ShaderProgram::AttachShader(const char *src, GLenum type)
  27 {
  28         GLuint shader_obj = glCreateShader(type);
  29         glShaderSource(shader_obj, 1, &src, 0);
  30         glCompileShader(shader_obj);
  31         int did_compile = 0;
  32         glGetShaderiv(shader_obj, GL_COMPILE_STATUS, &did_compile);
  33         if (!did_compile)
  34         {
  35                 char info_log[2048];
  36
  37                 glGetShaderInfoLog(shader_obj, 2048, nullptr, info_log);
  38                 Error("Shader compile error: %s\n", info_log);
  39                 return false;
  40         }
  41
  42         m_shaders.push_back(Shader{type, shader_obj});
  43         LazyCreateProgram();
  44         glAttachShader(m_program, shader_obj);
  45         return true;
  46 }
  47
  48 bool ShaderProgram::AttachVertexProgram(const char *src)
  49 {
  50         return AttachShader(src, GL_VERTEX_SHADER);
  51 }
  52
  53 bool ShaderProgram::AttachFragmentProgram(const char *src)
  54 {
  55         return AttachShader(src, GL_FRAGMENT_SHADER);
  56 }
  57
  58 bool ShaderProgram::AttachGeometryProgram(const char *src)
  59 {
  60         return AttachShader(src, GL_GEOMETRY_SHADER);
  61 }
  62
  63 bool ShaderProgram::Link()
  64 {
  65         glLinkProgram(m_program);
  66         return true;
  67 }
  68
  69 const void ShaderProgram::Use() const
  70 {
  71         glUseProgram(m_program);
  72 }
  73
  74 const GLint ShaderProgram::GetUniformLocation(const char *name) const
  75 {
  76         return glGetUniformLocation(m_program, name);
  77 }