cuda-samples/Samples/5_Domain_Specific/smokeParticles/GLSLProgram.cpp

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#include <stdlib.h>
#define HELPERGL_EXTERN_GL_FUNC_IMPLEMENTATION
#include <helper_gl.h>
#include "GLSLProgram.h"

GLSLProgram::GLSLProgram(const char *vsource, const char *fsource) {
  mProg = compileProgram(vsource, 0, fsource);
}

GLSLProgram::GLSLProgram(const char *vsource, const char *gsource,
                         const char *fsource, GLenum gsInput, GLenum gsOutput) {
  mProg = compileProgram(vsource, gsource, fsource, gsInput, gsOutput);
}

GLSLProgram::~GLSLProgram() {
  if (mProg) {
    glDeleteProgram(mProg);
  }
}

void GLSLProgram::enable() { glUseProgram(mProg); }

void GLSLProgram::disable() { glUseProgram(0); }

void GLSLProgram::setUniform1f(const char *name, float value) {
  GLint loc = glGetUniformLocation(mProg, name);

  if (loc >= 0) {
    glUniform1f(loc, value);
  } else {
#if _DEBUG
    fprintf(stderr, "Error setting parameter '%s'\n", name);
#endif
  }
}

void GLSLProgram::setUniform2f(const char *name, float x, float y) {
  GLint loc = glGetUniformLocation(mProg, name);

  if (loc >= 0) {
    glUniform2f(loc, x, y);
  } else {
#if _DEBUG
    fprintf(stderr, "Error setting parameter '%s'\n", name);
#endif
  }
}

void GLSLProgram::setUniform3f(const char *name, float x, float y, float z) {
  GLint loc = glGetUniformLocation(mProg, name);

  if (loc >= 0) {
    glUniform3f(loc, x, y, z);
  } else {
#if _DEBUG
    fprintf(stderr, "Error setting parameter '%s'\n", name);
#endif
  }
}

void GLSLProgram::setUniform4f(const char *name, float x, float y, float z,
                               float w) {
  GLint loc = glGetUniformLocation(mProg, name);

  if (loc >= 0) {
    glUniform4f(loc, x, y, z, w);
  } else {
#if _DEBUG
    fprintf(stderr, "Error setting parameter '%s'\n", name);
#endif
  }
}

void GLSLProgram::setUniformMatrix4fv(const GLchar *name, GLfloat *m,
                                      bool transpose) {
  GLint loc = glGetUniformLocation(mProg, name);

  if (loc >= 0) {
    glUniformMatrix4fv(loc, 1, transpose, m);
  } else {
#if _DEBUG
    fprintf(stderr, "Error setting parameter '%s'\n", name);
#endif
  }
}

void GLSLProgram::setUniformfv(const GLchar *name, GLfloat *v, int elementSize,
                               int count) {
  GLint loc = glGetUniformLocation(mProg, name);

  if (loc == -1) {
#ifdef _DEBUG
    fprintf(stderr, "Error setting parameter '%s'\n", name);
#endif
    return;
  }

  switch (elementSize) {
    case 1:
      glUniform1fv(loc, count, v);
      break;

    case 2:
      glUniform2fv(loc, count, v);
      break;

    case 3:
      glUniform3fv(loc, count, v);
      break;

    case 4:
      glUniform4fv(loc, count, v);
      break;
  }
}

void GLSLProgram::bindTexture(const char *name, GLuint tex, GLenum target,
                              GLint unit) {
  GLint loc = glGetUniformLocation(mProg, name);

  if (loc >= 0) {
    glActiveTexture(GL_TEXTURE0 + unit);
    glBindTexture(target, tex);
    glUseProgram(mProg);
    glUniform1i(loc, unit);
    glActiveTexture(GL_TEXTURE0);
  } else {
#if _DEBUG
    fprintf(stderr, "Error binding texture '%s'\n", name);
#endif
  }
}

GLuint GLSLProgram::checkCompileStatus(GLuint shader, GLint *status) {
  glGetShaderiv(shader, GL_COMPILE_STATUS, status);

  if (!(*status)) {
    char log[2048];
    int len;
    glGetShaderInfoLog(shader, 2048, (GLsizei *)&len, log);
    printf("Error: shader(%04d), Info log: %s\n", (int)shader, log);
    glDeleteShader(shader);
    return 0;
  }

  return 1;
}

GLuint GLSLProgram::compileProgram(const char *vsource, const char *gsource,
                                   const char *fsource, GLenum gsInput,
                                   GLenum gsOutput) {
  GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
  GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);

  GLint compiled = 0;

  glShaderSource(vertexShader, 1, &vsource, 0);
  glShaderSource(fragmentShader, 1, &fsource, 0);

  glCompileShader(vertexShader);

  if (checkCompileStatus(vertexShader, &compiled) == 0) {
    printf("<compileProgram compilation error with vertexShader>:\n");
    printf("%s\n", vsource);
    return 0;
  }

  glCompileShader(fragmentShader);

  if (checkCompileStatus(fragmentShader, &compiled) == 0) {
    printf("<compileProgram compilation error with fragmentShader>:\n");
    printf("%s\n", fsource);
    return 0;
  }

  GLuint program = glCreateProgram();

  glAttachShader(program, vertexShader);
  glAttachShader(program, fragmentShader);

  if (gsource) {
    GLuint geomShader = glCreateShader(GL_GEOMETRY_SHADER_EXT);
    glShaderSource(geomShader, 1, &gsource, 0);
    glCompileShader(geomShader);
    glGetShaderiv(geomShader, GL_COMPILE_STATUS, (GLint *)&compiled);

    if (checkCompileStatus(geomShader, &compiled) == 0) {
      printf("<compileProgram compilation error with geomShader>:\n");
      printf("%s\n", gsource);
      return 0;
    }

    glAttachShader(program, geomShader);

    glProgramParameteriEXT(program, GL_GEOMETRY_INPUT_TYPE_EXT, gsInput);
    glProgramParameteriEXT(program, GL_GEOMETRY_OUTPUT_TYPE_EXT, gsOutput);
    glProgramParameteriEXT(program, GL_GEOMETRY_VERTICES_OUT_EXT, 4);
  }

  glLinkProgram(program);

  // check if program linked
  GLint success = 0;
  glGetProgramiv(program, GL_LINK_STATUS, &success);

  if (!success) {
    char temp[1024];
    glGetProgramInfoLog(program, 1024, 0, temp);
    fprintf(stderr, "Failed to link program:\n%s\n", temp);
    glDeleteProgram(program);
    program = 0;
    exit(EXIT_FAILURE);
  }

  return program;
}