Method render

testbed/common/AABB.cpp:54–127

Render the AABB

// Render the AABB
void AABB::render(const openglframework::Vector3& position, const openglframework::Vector3& dimension,
                  openglframework::Color color, openglframework::Shader& shader,
                  const openglframework::Matrix4& worldToCameraMatrix) {

    // Render in wireframe mode
    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

    // Bind the shader
    shader.bind();

    // Transform matrix
    openglframework::Matrix4 transformMatrix = openglframework::Matrix4::identity();
    transformMatrix = openglframework::Matrix4::translationMatrix(position) * transformMatrix;

    // Set the normal matrix (inverse transpose of the 3x3 upper-left sub matrix of the
    // model-view matrix)
    const openglframework::Matrix4 localToCameraMatrix = worldToCameraMatrix * transformMatrix;
    const openglframework::Matrix3 normalMatrix =
                       localToCameraMatrix.getUpperLeft3x3Matrix().getInverse().getTranspose();
    shader.setMatrix3x3Uniform("normalMatrix", normalMatrix, false);


    // Compute the scaling matrix
    openglframework::Matrix4 scalingMatrix = openglframework::Matrix4(dimension.x, 0, 0, 0,
                                              0, dimension.y, 0, 0,
                                              0, 0, dimension.z, 0,
                                              0, 0, 0, 1);

    transformMatrix = transformMatrix * scalingMatrix;

    // Set the model to camera matrix
    shader.setMatrix4x4Uniform("localToWorldMatrix", transformMatrix);
    shader.setMatrix4x4Uniform("worldToCameraMatrix", worldToCameraMatrix);

    // Set the vertex color
    openglframework::Vector4 colorVec(color.r, color.g, color.b, color.a);
    shader.setIntUniform("isGlobalVertexColorEnabled", 1, false);
    shader.setVector4Uniform("globalVertexColor", colorVec, false);

    // Bind the VAO
    mVAO.bind();

    mVBOVertices.bind();

    // Get the location of shader attribute variables
    GLint vertexPositionLoc = shader.getAttribLocation("vertexPosition");
    GLint vertexNormalLoc = shader.getAttribLocation("vertexNormal", false);

    glEnableVertexAttribArray(vertexPositionLoc);
    glVertexAttribPointer(vertexPositionLoc, 3, GL_FLOAT, GL_FALSE, 0, (char*)nullptr);

    mVBONormals.bind();

    if (vertexNormalLoc != -1) glVertexAttribPointer(vertexNormalLoc, 3, GL_FLOAT, GL_FALSE, 0, (char*)nullptr);
    if (vertexNormalLoc != -1) glEnableVertexAttribArray(vertexNormalLoc);

    // Draw the geometry
    glDrawElements(GL_LINES, 12 * 2, GL_UNSIGNED_INT, (char*)nullptr);