[Android OpenGL Shader] #android #opengl #shader #glsl

shader_handler.cpp

#include "shader_handler.h"

bool ShaderHandler::initializeShader() {
  // vertex shader
  vshader = glCreateShader(GL_VERTEX_SHADER);
  glShaderSource(vshader, 1, &vertex_shader_source, nullptr);
  glCompileShader(vshader);
  
  GLint vertex_compiled;
  glGetShaderiv(vshader, GL_COMPILE_STATUS, &vertex_compiled);
  if (vertex_compiled != GL_TRUE) {
    GLsizei log_length = 0;
    GLchar message[1024];
    glShaderInfoLog(vshader, 1024, &log_length, message);
    __android_log_print(TAG, "error compiling vertex shader: %s", message);
    glDeleteShader(vshader);
    return false;
  }
  
  // fragment shader
  fshader = glCreateShader(GL_FRAGMENT_SHADER);
  glShaderSource(fshader, 1, &fragment_shader_source, nullptr);
  glCompileShader(fshader);
  
  GLint fragment_compiled;
  glGetShaderiv(fshader, GL_COMPILE_STATUS, &fragment_compiled);
  if (fragment_compiled != GL_TRUE) {
    GLsizei log_length = 0;
    GLchar message[1024];
    glShaderInfoLog(fshader, 1024, &log_length, message);
    __android_log_print(TAG, "error compiling fragment shader: %s", message);
    glDeleteShader(fshader);
    return false;
  }
  
  return true;
}

bool ShaderHandler::initializeProgram() {
  program = glCreateProgram();
  glAttachShader(program, vshader);
  glAttachShader(program, fshader);
  glLinkProgram(program);
  
  GLint program_linked;
  glGetProgramiv(program, GL_LINK_STATUS, &program_linked);
  if (program_linked != GL_TRUE) {
    GLsizei log_length = 0;
    GLchar message[1024];
    glGetProgramInfoLog(program, 1024, &log_length, message);
    __android_log_print(TAG, "error linking program: %s", message);
    glDeleteProgram(program);
    return false;
  }
  
  return true;
}

shader_handler.h

#include <GLES3/gl3.h>


class ShaderHandler {
public:
  bool initializeShader();
  bool initializeProgram();

private:
  GLuint vshader;
  GLuint fshader;
  GLuint program;
};