Hi,
I have a problem when I apply a shader to an object in osg. I tried it on two
machines. One with an intel G41 graphics card, which does not give me any
problem, and the other is a NVidia GTX 480, which gives me the problem. When
osg try to compile the shader, skip the following error:
FRAGMENT glCompileShader "" FAILED
VERTEX glCompileShader "" FAILED
glLinkProgram "" FAILED
Error: In Texture::Extensions::setupGLExtensions(..) OpenGL version test
failed, requires valid graphics context.
Vertex program:
Code:
uniform mat4 boneMatrices[2];
attribute vec4 weights;
attribute vec4 matrixIndices;
attribute float numBones;
varying vec2 Texcoord;
varying vec3 ViewDirection;
varying vec3 LightDirection;
varying vec3 Normal;
void main( void )
{
vec4 normal = vec4( gl_Normal.xyz, 0.0 );
vec4 tempPosition = vec4( 0.0, 0.0, 0.0, 0.0 );
vec4 tempNormal = vec4( 0.0, 0.0, 0.0, 0.0 );
for(int i = 0; i < int(numBones); i++ )
{
// Apply influence of bone i
tempPosition += vec4((boneMatrices[int(matrixIndices[i])] *
gl_Vertex).xyz,1.0) * weights[i];
// Transform normal by bone i
tempNormal += (boneMatrices[int(matrixIndices[i])] * normal) *
weights[i];
}
gl_Position = gl_ModelViewProjectionMatrix * tempPosition;
Texcoord = gl_MultiTexCoord0.xy;
vec4 fvObjectPosition = gl_ModelViewMatrix * gl_Vertex;
ViewDirection = normalize(-fvObjectPosition.xyz);
LightDirection = normalize(gl_LightSource[0].position.xyz -
fvObjectPosition.xyz);
Normal = normalize(gl_NormalMatrix * tempNormal.xyz);
}
Fragment program:
Code:
uniform sampler2D baseMap;
varying vec3 ViewDirection;
varying vec3 LightDirection;
varying vec3 Normal;
varying vec2 Texcoord;
void main( void )
{
float NdotL = max(dot(Normal, LightDirection), 0.0);
vec4 diffuse = NdotL * gl_FrontMaterial.diffuse * gl_LightSource[0].diffuse;
vec4 ambient = gl_FrontMaterial.ambient * gl_LightSource[0].ambient;
vec4 globalAmbient = gl_LightModel.ambient * gl_FrontMaterial.ambient;
vec3 fvReflection = normalize( ( ( 2.0 * Normal ) * NdotL ) -
LightDirection );
float fRDotV = max( 0.0, dot( fvReflection, ViewDirection ) );
vec4 specular = gl_FrontMaterial.specular * gl_LightSource[0].specular *
pow(fRDotV,200.0);
vec4 color = diffuse + globalAmbient + ambient + specular;
gl_FragColor = texture2D( baseMap, Texcoord ) * color;
}
I fail to understand what may be the problem... any idea?
Thank you!
Cheers,
Aitor
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=35085#35085
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