Use openGl with the raylib abstraction

[rmcvid]

Hey everyone,

I'm trying to work with OpenGL through raylib, but whenever I use an EBO it doesn't work at all. For example, I wrote a small test based on the tutorial from https://learnopengl.com/
I'm trying to draw a square made of two triangles indexed with an EBO, but nothing shows up.
I've included the code below.
Does anyone have an idea why the square isn’t rendering?

float vertices[] = {
    -0.5f, -0.5f, 0.0f, //bot left
     0.5f, -0.5f, 0.0f, // bot right
    -0.5f,  0.5f, 0.0f, // top left
    0.5f,  0.5f, 0.0f   // top right
};
unsigned int indices[] = {
    0, 1, 2,  // first triangle: bot left, bot right, top left
    1, 3, 2   // second triangle: bot right, top right, top left
};

int main(void)
{
    InitWindow(800, 600, "Shader carree");
    SetTargetFPS(60);

    const char *vs = "#version 330 core\n"
        "layout (location = 0) in vec3 aPos;\n"
        "void main()\n"
        "{\n"
        "   gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
        "}\0";
    const char *fs = "#version 330 core\n"
        "out vec4 FragColor;\n"
        "void main()\n"
        "{\n"
        "   FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
        "}\n\0";

    Shader shader = LoadShaderFromMemory(vs, fs);
    int locColor = GetShaderLocation(shader, "ourColor");


    // gen -- Load bind except for the vao one; 
    unsigned int vao = rlLoadVertexArray();                                  // generate but don't assign 
    unsigned int vbo = rlLoadVertexBuffer(vertices, sizeof(vertices), false);
    unsigned int ebo = rlLoadVertexBufferElement(indices, sizeof(indices), false);
    
    // no need to enable other it is done in the load function
    rlEnableVertexArray(vao);
    // set
    rlSetVertexAttribute(0, 3, RL_FLOAT, false, 3 * sizeof(float), 0);
    rlEnableVertexAttribute(0);

    int countFrame = 0;
    while (!WindowShouldClose())
    {
        BeginDrawing();
        ClearBackground(BLACK); 
        rlEnableShader(shader.id);
        rlEnableVertexArray(vao);
        //rlDrawVertexArray(0, 3);                   // from the vao it works but not from the ebo draw 3 vertices
        rlDrawVertexArrayElements(0,6,0);     // draw nothing
        rlDisableVertexArray();
        
        EndDrawing();

        countFrame++;
    }
    UnloadShader(shader);
    rlUnloadVertexArray(vao);
    rlUnloadVertexBuffer(vbo);
    rlUnloadVertexBuffer(ebo);
    CloseWindow();
    return 0;
}

[mcthomas]

Raylib's rlgl layer doesn't seem to properly support EBO indexed rendering, even though the functions exist. You could try vertex arrays with duplicated vertices (to draw the square as two separate triangles) instead of EBOs.

[klutzyhoromone]

I understand that this is a bit late but turn the indices into unsigned short

[ExpandingMan]

I can't seem to get rlDrawVertexArray to work at all. I can't produce any visible output from this. Drawing over it with DrawTriangle works fine, but form the shaders, nothing.