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- #include <iostream>
- #include <vgl.h>
- #include <LoadShaders.h>
- using std::cerr;
- using std::endl;
- enum VAO_IDs { Triangles, NumVAOs };
- enum Buffer_IDs { ArrayBuffer, NumBuffers };
- enum Attrib_IDs { vPosition = 0 };
- GLuint VAOs[NumVAOs];
- GLuint Buffers[NumBuffers];
- const GLuint NumVertices = 6;
- //---------------------------------------------------------------------
- //
- // init
- //
- void
- init(void)
- {
- glGenVertexArrays(NumVAOs, VAOs);
- glBindVertexArray(VAOs[Triangles]);
- GLfloat vertices[NumVertices][2] = {
- { -0.90, -0.90 }, // Triangle 1
- { 0.85, -0.90 },
- { -0.90, 0.85 },
- { 0.90, -0.85 }, // Triangle 2
- { 0.90, 0.90 },
- { -0.85, 0.90 }
- };
- glGenBuffers(NumBuffers, Buffers);
- glBindBuffer(GL_ARRAY_BUFFER, Buffers[ArrayBuffer]);
- glBufferData(GL_ARRAY_BUFFER, sizeof(vertices),
- vertices, GL_STATIC_DRAW);
- ShaderInfo shaders[] = {
- { GL_VERTEX_SHADER, "triangles.vert" },
- { GL_FRAGMENT_SHADER, "triangles.frag" },
- { GL_NONE, NULL }
- };
- GLuint program = LoadShaders(shaders);
- glUseProgram(program);
- glVertexAttribPointer(vPosition, 2, GL_FLOAT,
- GL_FALSE, 0, BUFFER_OFFSET(0));
- glEnableVertexAttribArray(vPosition);
- }
- //---------------------------------------------------------------------
- //
- // display
- //
- void
- display(void)
- {
- glClear(GL_COLOR_BUFFER_BIT);
- glBindVertexArray(VAOs[Triangles]);
- glDrawArrays(GL_TRIANGLES, 0, NumVertices);
- glFlush();
- }
- //---------------------------------------------------------------------
- //
- // main
- //
- int
- main(int argc, char** argv)
- {
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_RGBA);
- glutInitWindowSize(512, 512);
- glutInitContextVersion(4, 3);
- glutInitContextProfile(GLUT_CORE_PROFILE);
- glutCreateWindow(argv[0]);
- if (glewInit()) {
- cerr << "Unable to initialize GLEW ... exiting" << endl;
- exit(EXIT_FAILURE);
- }
- init();
- glutDisplayFunc(display);
- glutMainLoop();
- }
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