http://bugs.freedesktop.org/show_bug.cgi?id=26224
Summary: [GLSL] Cannot get location of a uniform struct member
Product: Mesa
Version: 7.6
Platform: x86-64 (AMD64)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
AssignedTo: mesa3d-dev@lists.sourceforge.net
ReportedBy: mo6e...@gmail.com
Hello,
using the below fragment and vertex shaders, I am unable to obtain the location
of Material.color, Material.emission or Material.specular. After successfully
compiling the shaders and linking a program, calling
glUniformLocation(program, "Material.color");
glUniformLocation(program, "Material.emission");
glUniformLocation(program, "Material.specular");
all return -1; and glGetError() returns GL_NO_ERROR.
Strangely,
glUniformLocation(program, "Material");
returns a valid uniform location, which can be set using glUniform1f and
corresponds to Material.color.r .
Even more perplexingly, calling glGetActiveUniform returns the following info:
Name: Material
Size: 2
Type: 5126 (GL_FLOAT)
I can get the location of Material[0] and Material[1] (and even higher indices
without raising errors).
Setting Material[0] has the same effect as setting Material.color.r and
setting Material[1] has the same effect as setting Material.specular.
Setting any higher index does not have a discernible effect.
My hardware is an Intel GM45 Express IGP.
I'm using Mesa 7.6 from Ubuntu 9.10 with a 2.6.32.2 kernel.
Vertex shader:
uniform mat4 MV;
uniform mat4 MVP;
uniform mat3 N;
varying vec3 EyeN;
varying vec4 EyeV;
void main() {
gl_PointSize = 1;
gl_Position = MVP * gl_Vertex;
EyeV = MV * gl_Vertex;
EyeN = normalize( N * gl_Normal );
}
Fragment shader:
struct TMaterial {
vec3 color;
float emission;
float specular;
};
uniform TMaterial Material;
uniform float LightAmbient;
varying vec3 EyeN;
varying vec4 EyeV;
void main() {
vec3 v3EyeV = vec3(EyeV / EyeV.w);
float emissionAttenuation = dot(v3EyeV, v3EyeV);
float effEmission = Material.emission / (1 + emissionAttenuation);
vec3 effColor = Material.color * ( effEmission + LightAmbient );
gl_FragColor = vec4(effColor, 1);
}
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