Hello everyone,
I've been evaluating the OMAP3 using the beagle board C4. I'm trying to figure out how to enable extension GL_OES_standard_derivatives. But i encountered some weird issues.
Basically, i want to call built-in functions ( dFdx(), dFdy() , fwidth()) in my fragment shader(See below).
precision mediump float;
#extension GL_OES_standard_derivatives : enable
varying vec3 myVec;
uniform vec4 vColor;
void main() {
vec3 px = dFdx(myVec);
vec3 py = dFdy(myVec); // this line can not compile.
gl_FragColor = vColor;
}
Whenever i add dFdy() , fwidth() to the shader, the fragment shader fails to compile with error message "Compile Failed". But the strange thing is dFdx() can be compiled and linked successfully. So i guess the extension has been enabled, but some built-in functions (dFdy() , fwidth()) are mising.
I work on beagleboard C4(OMAP3530DCBB72 720MHZ) with Angstrom linux distro, using OMAP35x_Graphics_SDK_3_01_00_06.
Could anyone give me a pointer on how to resolve this issue.
Thanks for any help or advice!
