mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 10:35:42 +00:00
c75facf940
Based on the work of Tyson Neuroth and Huu Tan Nguyen at the VTK-m code sprint. Shows how to invoke a simple worklet to generate coordinates and colors, and than use opengl interop to display it to the screen.
133 lines
4.1 KiB
C++
Executable File
133 lines
4.1 KiB
C++
Executable File
//============================================================================
|
|
// Copyright (c) Kitware, Inc.
|
|
// All rights reserved.
|
|
// See LICENSE.txt for details.
|
|
// This software is distributed WITHOUT ANY WARRANTY; without even
|
|
// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
// PURPOSE. See the above copyright notice for more information.
|
|
//
|
|
// Copyright 2014 Sandia Corporation.
|
|
// Copyright 2014 UT-Battelle, LLC.
|
|
// Copyright 2014 Los Alamos National Security.
|
|
//
|
|
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
|
|
// the U.S. Government retains certain rights in this software.
|
|
//
|
|
// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
|
|
// Laboratory (LANL), the U.S. Government retains certain rights in
|
|
// this software.
|
|
//============================================================================
|
|
|
|
#ifndef LOAD_SHADERS
|
|
#define LOAD_SHADERS
|
|
|
|
#if defined (__APPLE__)
|
|
# include <GLUT/glut.h>
|
|
#else
|
|
# include <GL/glut.h>
|
|
#endif
|
|
|
|
namespace shaders
|
|
{
|
|
static std::string const& make_fragment_shader_code()
|
|
{
|
|
static std::string const data =
|
|
"#version 120\n"
|
|
"void main(void)"
|
|
"{"
|
|
" gl_FragColor = gl_Color;"
|
|
"}";
|
|
|
|
return data;
|
|
}
|
|
|
|
static std::string const& make_vertex_shader_code()
|
|
{
|
|
static std::string const data =
|
|
"#version 120\n"
|
|
"attribute vec3 posAttr;"
|
|
"uniform mat4 MVP;"
|
|
"void main()"
|
|
"{"
|
|
" vec4 pos = vec4( posAttr, 1.0 );"
|
|
" gl_FrontColor = gl_Color;"
|
|
" gl_Position = MVP * pos;"
|
|
"}";
|
|
|
|
return data;
|
|
}
|
|
|
|
}
|
|
|
|
inline GLuint LoadShaders()
|
|
{
|
|
// Create the shaders
|
|
GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
|
|
GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
|
|
|
|
// Get the Vertex Shader code
|
|
std::string VertexShaderCode = shaders::make_vertex_shader_code();
|
|
|
|
// Get the Fragment Shader code
|
|
std::string FragmentShaderCode = shaders::make_fragment_shader_code();
|
|
|
|
GLint Result = GL_FALSE;
|
|
int InfoLogLength;
|
|
|
|
// Compile Vertex Shader
|
|
std::cout << "Compiling vertex shader" << std::endl;
|
|
char const * VertexSourcePointer = VertexShaderCode.c_str();
|
|
glShaderSource(VertexShaderID, 1, &VertexSourcePointer, NULL);
|
|
glCompileShader(VertexShaderID);
|
|
|
|
// Check Vertex Shader
|
|
glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
|
|
glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
|
|
std::vector<char> VertexShaderErrorMessage( static_cast<std::size_t>(InfoLogLength) );
|
|
if(VertexShaderErrorMessage.size() > 0)
|
|
{
|
|
glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
|
|
std::cout << &VertexShaderErrorMessage[0] << std::endl;
|
|
}
|
|
|
|
// Compile Fragment Shader
|
|
std::cout << "Compiling fragment shader" << std::endl;
|
|
char const * FragmentSourcePointer = FragmentShaderCode.c_str();
|
|
glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer, NULL);
|
|
glCompileShader(FragmentShaderID);
|
|
|
|
// Check Fragment Shader
|
|
glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
|
|
glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
|
|
std::vector<char> FragmentShaderErrorMessage( static_cast<std::size_t>(InfoLogLength) );
|
|
if(FragmentShaderErrorMessage.size() > 0)
|
|
{
|
|
glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
|
|
std::cout << &FragmentShaderErrorMessage[0] << std::endl;
|
|
}
|
|
|
|
// Link the program
|
|
std::cout << "Linking program" << std::endl;
|
|
GLuint ProgramID = glCreateProgram();
|
|
glAttachShader(ProgramID, VertexShaderID);
|
|
glAttachShader(ProgramID, FragmentShaderID);
|
|
glLinkProgram(ProgramID);
|
|
|
|
// Check the program
|
|
glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
|
|
glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
|
|
std::vector<char> ProgramErrorMessage( static_cast<std::size_t>(InfoLogLength) );
|
|
if(ProgramErrorMessage.size() > 0)
|
|
{
|
|
glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
|
|
std::cout << &ProgramErrorMessage[0] << std::endl;
|
|
}
|
|
|
|
|
|
glDeleteShader(VertexShaderID);
|
|
glDeleteShader(FragmentShaderID);
|
|
|
|
return ProgramID;
|
|
}
|
|
|
|
#endif |