c++ - OpenGL ES 2.0 shader integer operations -


i having trouble getting integer operations working in opengl es 2.0 shaders.

gl_shading_language_version: opengl es glsl es 1.00

one example lines i'm having issues is: color.r = floor(f / 65536); error: 

error linking program: error:semantic-4 (vertex shader, line 13) operator not supported operand types

to give more context what's happening, within library working way pass color float 3 integers have been bit shifted into. 3 (8-bit) int -> float pass shader | float - > r g b (using integer manipulation) works fine on normal opengl having trouble making work on raspberry pi.

full vexter shader code here:

attribute vec4 position;  varying vec3 texcoord;  uniform mat4 model; uniform mat4 view; uniform mat4 proj;  vec3 unpackcolor(float f)  {     vec3 color;     f -= 0x1000000;     color.r = floor(f / 65536);     color.g = floor((f - color.r * 65536) / 256.0);     color.b = floor(f - color.r * 65536 - color.g * 256.0);      return color / 256.0; }  void main() {     texcoord = unpackcolor(position.w);     gl_position = proj * view * model * vec4(position.xyz, 1.0); }

any ideas how working?


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