openGL ES shaders wrong uniforms location -

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vertex shader looks this:

uniform mat4 projectionmatrix; uniform mat4 modelmatrix; uniform mat4 viewmatrix;  attribute vec4 vposition; attribute vec4 vcolor;  varying vec4 vdestinationcolor;  void main(void) {     gl_position         = projectionmatrix * modelmatrix * viewmatrix * vposition;     vdestinationcolor   = vcolor; }

objective-c code:

_projectionmatrixslot   = glgetuniformlocation(_programhandle, "projectionmatrix"); _modelmatrixslot        = glgetuniformlocation(_programhandle, "modelmatrix"); _viewmatrixslot         = glgetuniformlocation(_programhandle, "viewmatrix");  _positionattribslot     = glgetattriblocation(_programhandle, "vposition"); _colorattribslot        = glgetattriblocation(_programhandle, "vcolor");

here _projectionmatrixslot _viewmatrixslot _modelmatrixslot equals 4294967295 while _positionattribslot , _colorattribslot fine

the compiler free throw away variables not used in code. therefore, if uniform declared in shader, long not used, reported location can -1 or max int or unsigned int.

you may have attached wrong vertex shader, not 1 post here.


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