python - GLSL code not rendering on NVIDIA via Cg compiler -

i building vision research experiment in python , opengl. performing displacement mapping of texture. glsl code version 330 compatible, , renders on machine. when run code on experiment desktop, not anything, there no logged messages or errors, renders blank screen.

i ran following on both machines:

print "opengl version:\t\t%s" % glgetstring(gl_version) print "glsl version:\t\t%s" % glgetstring(gl_shading_language_version) print "vendor:\t\t\t%s" % glgetstring(gl_vendor) print "renderer:\t\t%s" % glgetstring(gl_renderer) 

from machine, following output:

opengl version: 4.0.0 - build 9.17.10.2867 glsl version: 4.00 - build 9.17.10.2867 vendor: intel renderer: intel(r) hd graphics 4000 

from experiment desktop, following:

opengl version: 3.3.0 glsl version: 3.30 nvidia via cg compiler vendor: nvidia corporation renderer: quadro fx 3700/pcie/sse2 

here excerpt vertex , fragment shaders, there overlooking?

vertex.shd:

#version 330 compatibility  layout (location = 0) in vec2 vertvertex; layout (location = 1) in vec2 verttexcoord; layout (location = 2) in vec3 vertnormal;  uniform mat4 modelviewmatrix; uniform mat4 projectionmatrix;  uniform sampler2d heightmap;  out vec4 fragvertex; out vec2 fragtexcoord;  float convert_luminance(vec4 pixel) {     return (0.2126 * pixel.r) + (0.7152 + pixel.g) + (0.0722 * pixel.b); }  vec4 displacement_mapping(void) {     // pixel values texcoord     vec4 pixel = texture2d(heightmap, verttexcoord.st);     float grey_value = convert_luminance(pixel);      // return displaced position coordinates     return vec4(vertnormal * grey_value, 0.0) + vec4(vertvertex, 0.0, 0.0); }  void main(void) {     fragtexcoord = verttexcoord.st;     fragvertex = displacement_mapping();      gl_position = projectionmatrix * (modelviewmatrix * fragvertex); } 

fragment.shd:

#version 330 compatibility  in vec2 fragtexcoord; in vec4 fragvertex;  uniform sampler2d colormap;  void main(void) {     gl_fragcolor = texture2d(colormap, fragtexcoord.st); }