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绿色导航

1 片段着色器使用统一变量

  char fShaderStr[] =
  "#version 300 es                              \n"
  "precision mediump float;                     \n"
  "uniform float rColor;"
  "uniform float gColor;"
  "out vec4 fragColor;                          \n"
  "in  vec4 tranglePos;    \n"
  "void main()                                  \n"
  "{                                            \n"
  "    fragColor = vec4(rColor,gColor,0.6,1.0 ); \n"
  "}                                            \n";

2 Draw函数中获得统一变量位置，然后设置统一变量

  nLocation=glGetUniformLocation(userData->programObject,"rColor");
  glUniform1f(nLocation, rColor);
  nLocation=glGetUniformLocation(userData->programObject,"gColor");
  glUniform1f(nLocation, gColor);