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C-/C++-Quelltext

#define LOAD_ENTRYPOINT(name, var, type) \
if(!var) { \
    var = reinterpret_cast<type>(wglGetProcAddress(name)); \
    assert(var != 0); \
}
typedef HGLRC (APIENTRY * PFNWGLCREATECONTEXTATTRIBSARBPROC)(HDC hDC, HGLRC hShareContext, const int *attribList);
static PFNWGLCREATECONTEXTATTRIBSARBPROC pfnCreateContextAttribsARB = 0; 
LOAD_ENTRYPOINT("wglCreateContextAttribsARB", pfnCreateContextAttribsARB, PFNWGLCREATECONTEXTATTRIBSARBPROC); // Zeile 76

C-/C++-Quelltext

// Vertices
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
glVertexAttribPointer(
        0,
        3,
        GL_FLOAT,
        GL_FALSE,
        0,
        (void*)0
);

// UVs
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, uvbuffer);
glVertexAttribPointer(
        1,
        2,
        GL_FLOAT,
        GL_FALSE,
        0,
        (void*)0
);

glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
std::cout << glGetError() << std::endl;

C-/C++-Quelltext

// Vertex
static const GLfloat vertex[] = {
    A.x, A.y, 0.f,
    B.x, B.y, 0.f,
    C.x, C.y, 0.f,
    D.x, D.y, 0.f,
};

// UVs
static const GLfloat uvs[] = {
    0.0, 0.0,
    0.0, 1.0,
    1.0, 0.0,
    1.0, 1.0,
};

glGenBuffers(1, &vertexbuffer);
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertex), vertex, GL_STATIC_DRAW);

glGenBuffers(1, &uvbuffer);
glBindBuffer(GL_ARRAY_BUFFER, uvbuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(uvs), uvs, GL_STATIC_DRAW);

C-/C++-Quelltext

GLuint vao=0;
    glGenVertexArrays(1, &vao);
    glBindVertexArray(vao);