stream1.cpp

char* vertex_shader = 
        "#version 100\n"
        "attribute highp vec3 mesh_xyz;\n"
        "attribute highp vec4 mesh_color;\n"
        "uniform   highp mat4 model_view;\n"
        "uniform   highp mat4 projection;\n"
        "varying   highp vec4 vertex_color;\n"
        "varying   highp vec4 vertex_position;\n"
        "void main () {\n"
        "    vertex_color = mesh_color;\n"
        "    vertex_position = gl_Position = projection * model_view * vec4(mesh_xyz, 1);\n"
        "}\n"
        ;
    
    char* fragment_shader = 
        "#version 100\n"
        "varying highp vec4 vertex_color;\n"
        "varying highp vec4 vertex_position;\n"
        "void main () {\n"
        "    if (distance(vertex_position, gl_FragCoord) < 10.0) {\n"
        "        gl_FragColor = vec4(0.0,0.0,0.0,1.0);\n"
        "    } else {\n"
        "        gl_FragColor = vertex_color;\n"
        "    }\n"
        "}\n";