Exemplo n.º 1
0
        public BasicFillShader(CanvasToShaderSharedResource canvasShareResource)
            : base(canvasShareResource)
        {
            //----------------
            //vertex shader source
            string vs = @"        
            attribute vec2 a_position; 
            uniform mat4 u_mvpMatrix;
            uniform vec4 u_solidColor;              
            varying vec4 v_color;
 
            void main()
            {
                gl_Position = u_mvpMatrix* vec4(a_position[0],a_position[1],0,1); 
                v_color= u_solidColor;
            }
            ";
            //fragment source
            string fs = @"
                precision mediump float;
                varying vec4 v_color; 
                void main()
                {
                    gl_FragColor = v_color;
                }
            ";
            if (!shaderProgram.Build(vs, fs))
            {
                throw new NotSupportedException();
            }

            a_position = shaderProgram.GetAttrV2f("a_position");
            u_matrix = shaderProgram.GetUniformMat4("u_mvpMatrix");
            u_solidColor = shaderProgram.GetUniform4("u_solidColor");
        }
 protected override void OnProgramBuilt()
 {
     _u_color = shaderProgram.GetUniform4("u_color");
     _u_buffer = shaderProgram.GetUniform1("u_buffer");
     _u_gamma = shaderProgram.GetUniform1("u_gamma");
 }
        public InvertAlphaLineSmoothShader(CanvasToShaderSharedResource canvasShareResource)
             : base(canvasShareResource)
        {
            //-------------------------------------------------------------------------------
            string vs = @"                   
            attribute vec4 a_position;    

            uniform mat4 u_mvpMatrix;
            uniform vec4 u_solidColor; 
            uniform float u_linewidth;

            varying vec4 v_color; 
            varying float v_distance;
            varying float p0;
            
            void main()
            {   
                
                float rad = a_position[3];
                v_distance= a_position[2];

                float n_x = sin(rad); 
                float n_y = cos(rad);  

                vec4 delta;
                if(v_distance <1.0){                                         
                    delta = vec4(-n_x * u_linewidth,n_y * u_linewidth,0,0);                       
                }else{                      
                    delta = vec4(n_x * u_linewidth,-n_y * u_linewidth,0,0);
                }
    
                if(u_linewidth <= 0.5){
                    p0 = 0.5;      
                }else if(u_linewidth <=1.0){
                    p0 = 0.45;  
                }else if(u_linewidth>1.0 && u_linewidth<3.0){
                    
                    p0 = 0.25;  
                }else{
                    p0= 0.1;
                }
                
                vec4 pos = vec4(a_position[0],a_position[1],0,1) + delta;                 
                gl_Position = u_mvpMatrix* pos;                

                v_color= u_solidColor;
            }
            ";
            //fragment source
            //this is invert fragment shader *** 
            //so we 
            string fs = @"
                precision mediump float;
                varying vec4 v_color;  
                varying float v_distance;
                varying float p0;                
                void main()
                {
                    float d0= v_distance; 
                    float p1= 1.0-p0;
                    float factor= 1.0 /p0;
            
                    if(d0 < p0){                        
                        gl_FragColor = vec4(v_color[0],v_color[1],v_color[2], 1.0 -(v_color[3] *(d0 * factor)));
                    }else if(d0> p1){                         
                        gl_FragColor= vec4(v_color[0],v_color[1],v_color[2],1.0-(v_color[3] *((1.0-d0)* factor)));
                    }
                    else{ 
                       gl_FragColor = vec4(0,0,0,0);                        
                    } 
                }
            ";
            //---------------------
            if (!shaderProgram.Build(vs, fs))
            {
                return;
            }
            //-----------------------

            a_position = shaderProgram.GetAttrV4f("a_position");
            u_matrix = shaderProgram.GetUniformMat4("u_mvpMatrix");
            u_solidColor = shaderProgram.GetUniform4("u_solidColor");
            u_linewidth = shaderProgram.GetUniform1("u_linewidth");
            _strokeColor = Drawing.Color.Black;
        }
 protected override void OnProgramBuilt()
 {
     _bgColor = shaderProgram.GetUniform4("bgColor");
     _fgColor = shaderProgram.GetUniform4("fgColor");
 }
Exemplo n.º 5
0
 internal void AssignStrokeColorToVar(OpenTK.Graphics.ES20.ShaderUniformVar4 color)
 {
     color.SetValue(_stroke_r, _stroke_g, _stroke_b, _stroke_a);
 }