public void InitShader()
{
if (isInited)
{
return;
}
//----------------
//vertex shader source
string vs = @"
attribute vec3 a_position;
attribute vec4 a_color;
attribute vec2 a_texcoord;
uniform mat4 u_mvpMatrix;
uniform vec4 u_solidColor;
uniform int u_useSolidColor;
uniform int u_useAggColor;
varying vec4 v_color;
varying vec2 v_texcoord;
void main()
{
float a= a_position[2]; //before matrix op
gl_Position = u_mvpMatrix* vec4(a_position[0],a_position[1],0,1);
if(u_useAggColor !=0)
{
v_color= vec4(u_solidColor.r /255.0,u_solidColor.g /255.0,u_solidColor.b/255.0, a/255.0);
}
else if(u_useSolidColor !=0)
{
v_color= u_solidColor;
}
else
{
v_color = a_color;
}
v_texcoord= a_texcoord;
}
";
//fragment source
string fs = @"
precision mediump float;
varying vec4 v_color;
varying vec2 v_texcoord;
void main()
{
gl_FragColor= v_color;
}
";
if (!shaderProgram.Build(vs, fs))
{
throw new NotSupportedException();
}
a_position = shaderProgram.GetVtxAttrib("a_position");
a_color = shaderProgram.GetVtxAttrib("a_color");
a_textureCoord = shaderProgram.GetVtxAttrib("a_texcoord");
u_matrix = shaderProgram.GetUniformMat4("u_mvpMatrix");
u_useSolidColor = shaderProgram.GetUniform1("u_useSolidColor");
u_useAggColor = shaderProgram.GetUniform1("u_useAggColor");
u_solidColor = shaderProgram.GetUniform4("u_solidColor");
shaderProgram.UseProgram();
isInited = true;
}
protected override void OnInitGLProgram(object sender, EventArgs args)
{
string vs = @"
attribute vec4 a_position;
attribute vec4 a_color;
uniform mat4 u_mvpMatrix;
uniform vec4 u_solidColor;
uniform int u_useSolidColor;
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;
if(u_useSolidColor !=0)
{
v_color= u_solidColor;
}
else
{
v_color = a_color;
}
}
";
//fragment source
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], v_color[3] *(d0 * factor));
}else if(d0> p1){
gl_FragColor =vec4(v_color[0],v_color[1],v_color[2], v_color[3] *((1.0-d0)* factor));
}
else{
gl_FragColor =v_color;
}
}
";
if (!shaderProgram.Build(vs, fs))
{
throw new NotSupportedException();
}
a_position = shaderProgram.GetVtxAttrib("a_position");
a_color = shaderProgram.GetVtxAttrib("a_color");
u_matrix = shaderProgram.GetUniformMat4("u_mvpMatrix");
u_useSolidColor = shaderProgram.GetUniform1("u_useSolidColor");
u_solidColor = shaderProgram.GetUniform4("u_solidColor");
u_linewidth = shaderProgram.GetUniform1("u_linewidth");
//--------------------------------------------------------------------------------
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
GL.ClearColor(1, 1, 1, 1);
//setup viewport size
int max = Math.Max(this.Width, this.Height);
//square viewport
GL.Viewport(0, 0, max, max);
orthoView = MyMat4.ortho(0, max, 0, max, 0, 1);
//--------------------------------------------------------------------------------
//load image
}
protected override void OnInitGLProgram(object sender, EventArgs args)
{
//----------------
//vertex shader source
string vs = @"
attribute vec2 a_position;
attribute vec4 a_color;
attribute vec2 a_texcoord;
uniform mat4 u_mvpMatrix;
uniform vec4 u_solidColor;
uniform int u_useSolidColor;
varying vec4 v_color;
varying vec2 v_texcoord;
void main()
{
gl_Position = u_mvpMatrix* vec4(a_position[0],a_position[1],0,1);
if(u_useSolidColor !=0)
{
v_color= u_solidColor;
}
else
{
v_color = a_color;
}
v_texcoord= a_texcoord;
}
";
//fragment source
string fs = @"
precision mediump float;
varying vec4 v_color;
varying vec2 v_texcoord;
void main()
{
//gl_FragColor = vec4(1,v_texcoord.y,0,1);
gl_FragColor= v_color;
}
";
if (!shaderProgram.Build(vs, fs))
{
throw new NotSupportedException();
}
a_position = shaderProgram.GetVtxAttrib("a_position");
a_color = shaderProgram.GetVtxAttrib("a_color");
a_textureCoord = shaderProgram.GetVtxAttrib("a_texcoord");
u_matrix = shaderProgram.GetUniformMat4("u_mvpMatrix");
u_useSolidColor = shaderProgram.GetUniform1("u_useSolidColor");
u_solidColor = shaderProgram.GetUniform4("u_solidColor");
//--------------------------------------------------------------------------------
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
GL.ClearColor(1, 1, 1, 1);
//setup viewport size
int max = Math.Max(this.Width, this.Height);
//square viewport
GL.Viewport(0, 0, max, max);
orthoView = MyMat4.ortho(0, max, 0, max, 0, 1);
//--------------------------------------------------------------------------------
//load image
}
