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绿色导航

统一变量根据线段设置不同颜色

     char vShaderStr[] =
        "#version 300 es                          \n"
        "layout(location = 0) in vec4 vPosition;  \n"
        "out vec4 tranglePos;   \n"
        "void main()                              \n"
        "{                                        \n"
        "   gl_Position = vPosition;              \n"
        "   tranglePos=vPosition;  \n"
        "}                                        \n";

  
     
     char fShaderStr[] =
        "#version 300 es                              \n"
        "precision mediump float;                     \n"
        "uniform vec2 verPos;"
        "uniform float rColor;"
        "uniform float gColor;"
        "uniform float bColor;"
        "out vec4 fragColor;                          \n"
        "in  vec4 tranglePos;    \n"
        "void main()                                  \n"
        "{                                            \n"
        "if(tranglePos.y>(verPos.y+0.5)/verPos.x*tranglePos.x-0.5)"
        "    fragColor = vec4(rColor,gColor,bColor,1.0 ); \n"
        "else"
        "    fragColor = vec4(1,gColor,0,1.0 ); "
        "}                                            \n";

  
  
  void Draw ( ESContext *esContext )
  {
     UserData *userData = esContext->userData;
     GLfloat vVertices[] = {  
                              x,  y, 0.0f,
                              -0.5f, 0.0f, 0.0f,

0.5f, 0.0f, 0.0f,

                              x,  -y, 0.0f,
                              -0.5f, 0.0f, 0.0f,

0.5f, 0.0f, 0.0f

                           };
     int nLocation=0;
      x=r*cos(angle);
      y=r*sin(angle);
     angle+=0.1f;
     if(bAdd)
          xAdd+=0.01f;
     else
         xAdd-=0.01f;
     if(x+xAdd>1)
       bAdd=FALSE; // xAdd=-1-x;
     
     if(x+xAdd<-1)
       bAdd=TRUE; // xAdd=-1-x;
     if(bRedAdd)
        rColor+=0.02f;
     else
        rColor-=0.01f;
     if(bGreenAdd)
       gColor+=0.01f;
     else
       gColor-=0.01f;
     if(bBlueAdd)
       bColor+=0.01f;
     else
       bColor-=0.01f;
     if(rColor>1.0f)
         bRedAdd=FALSE;
     if(rColor<0.0f)
          bRedAdd=TRUE;
      if(gColor>1.0f)
         bGreenAdd=FALSE;
      if(gColor<0.0f)
          bGreenAdd=TRUE;
      if(bColor>1.0f)
         bBlueAdd=FALSE;
      if(bColor<0.0f)
          bBlueAdd=TRUE;
    nLocation=glGetUniformLocation(userData->programObject,"rColor");
    glUniform1f(nLocation, rColor);
    nLocation=glGetUniformLocation(userData->programObject,"gColor");
    glUniform1f(nLocation, gColor);
     nLocation=glGetUniformLocation(userData->programObject,"bColor");
    glUniform1f(nLocation, bColor);
       nLocation=glGetUniformLocation(userData->programObject,"verPos");
    glUniform2f(nLocation, x,y);
     // Set the viewport
     glViewport ( 0, 0, esContext->width, esContext->height );
     // Clear the color buffer
     glClear ( GL_COLOR_BUFFER_BIT );
     // Use the program object
     glUseProgram ( userData->programObject );
     // Load the vertex data
     glVertexAttribPointer ( 0, 3, GL_FLOAT, GL_FALSE, 0, vVertices );
     glEnableVertexAttribArray ( 0 );
     glDrawArrays ( GL_TRIANGLES, 0,3 );