glClearBufferfi

glClearBuffer: man3/glClearBuffer.xml

glClearBuffer* clears the specified buffer to the specified value(s). If buffer is GL_COLOR, a particular draw buffer GL_DRAW_BUFFER i is specified by passing i as drawBuffer. In this case, value points to a four-element vector specifying the R, G, B and A color to clear that draw buffer to. If buffer is one of GL_FRONT, GL_BACK, GL_LEFT, GL_RIGHT, or GL_FRONT_AND_BACK, identifying multiple buffers, each selected buffer is cleared to the same value. Clamping and conversion for fixed-point color buffers are performed in the same fashion as glClearColor. If buffer is GL_DEPTH, drawBuffer must be zero, and value points to a single value to clear the depth buffer to. Only glClearBufferfv should be used to clear depth buffers. Clamping and conversion for fixed-point depth buffers are performed in the same fashion as glClearDepth. If buffer is GL_STENCIL, drawBuffer must be zero, and value points to a single value to clear the stencil buffer to. Only glClearBufferiv should be used to clear stencil buffers. Masking and type conversion are performed in the same fashion as glClearStencil. glClearBufferfi may be used to clear the depth and stencil buffers. buffer must be GL_DEPTH_STENCIL and drawBuffer must be zero. depth and stencil are the depth and stencil values, respectively. The result of glClearBuffer is undefined if no conversion between the type of value and the buffer being cleared is defined. However, this is not an error.