Example : Object Rendering

Pipeline scripts can also be used to render simple 3D scenes by using the (optional) OBJ and STL loading modules. The following scripts load and reanders the Teapot object :

TEXTURE_FORMAT:outputFormat(512, 512, GL_RGB, GL_UNSIGNED_BYTE)

// Location of the teapot :
ADD_PATH(Resources/)
// Load the object :
CALL:LOAD_OBJ_GEOMETRY(teapot.obj, teapot)

SOURCE:vertexShader
{
        #version 130
        out vec3 outN;  // the normal going to the fragment shader.
        uniform float   ax = 0.0, // angle x.
                        ay = 0.0, // angle y.
                        s = 1.0;  // scale.
        uniform vec3 offset = vec3(0.0);// offset.

        void main()
        {
                // Rotation matrices :
                mat3 Mx = mat3( 1.0, 0.0, 0.0,
                                0.0, cos(ax), sin(ax),
                                0.0, -sin(ax), cos(ax));
                mat3 My = mat3( cos(ay), 0.0, sin(ay),
                                0.0, 1.0, 0.0,
                                -sin(ay), 0.0, cos(ay));
                // Transformation of the vertices :
                gl_Position = vec4(Mx*My*s*gl_Vertex.xyz - offset, 1);
                // Pass the normals :
                outN = gl_Normal.xyz;
        }
}

SOURCE:fragmentShader
{
        #version 130

        in vec3 outN; // the normal incoming from the Vertex Shader
        out vec4 outputTexture;
        uniform vec3 light = vec3(1.0, 0.0, 1.0);
        uniform float alpha = 0.1;

        void main()
        {
                // Write the normals to the output fragment :
                vec3 c = abs(outN.xzy);
                // With some illumination :
                outputTexture.rgb = alpha*c + (1.0-alpha)*c*max(dot(outN.xyz,normalize(light)),0.0);
        }
}

FILTER_LAYOUT:showTeapotFilter(outputFormat)
{
        GL_VERTEX_SHADER(vertexShader)
        GL_FRAGMENT_SHADER(fragmentShader)
        // Use the teapot geometry :
        GL_RENDER(teapot)
        // Enable depth test :
        GL_DEPTH_TEST(GL_LESS)
}

PIPELINE_MAIN:showTeapotPipeline
{
        // Only generate an image :
        OUTPUT_PORTS(outputTexture)
        FILTER_INSTANCE:showTeapotFilter
}

Sample output :