OpenGL uniform array of structures
So i have a custom structure in the fragment shader and an uniform variable that is an array of these structures. It is defined like this:
#version 130
#defi
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Since people often blindly fumble around trying to figure out what the cause of
glGetUniformLocation (...)returning -1 is, I figured I would share some modified code that I use to enumerate all uniforms per-GLSL program. I actually use a map structure to do type enum to string name but that would be more complicated than necessary.Utility structure to print human-readable types (up to GLSL 430):
struct glsl_type_set { GLenum type; const char* name; } type_set [] = { GL_INVALID_ENUM, "invalid", GL_FLOAT, "float", GL_FLOAT_VEC2, "vec2", GL_FLOAT_VEC3, "vec3", GL_FLOAT_VEC4, "vec4", GL_DOUBLE, "double", GL_DOUBLE_VEC2, "dvec2", GL_DOUBLE_VEC3, "dvec3", GL_DOUBLE_VEC4, "dvec4", GL_INT, "int", GL_INT_VEC2, "ivec2", GL_INT_VEC3, "ivec3", GL_INT_VEC4, "ivec4", GL_UNSIGNED_INT, "unsigned int", GL_UNSIGNED_INT_VEC2, "uvec2", GL_UNSIGNED_INT_VEC3, "uvec3", GL_UNSIGNED_INT_VEC4, "uvec4", GL_BOOL, "bool", GL_BOOL_VEC2, "bvec2", GL_BOOL_VEC3, "bvec3", GL_BOOL_VEC4, "bvec4", GL_FLOAT_MAT2, "mat2", GL_FLOAT_MAT3, "mat3", GL_FLOAT_MAT4, "mat4", GL_FLOAT_MAT2x3, "mat2x3", GL_FLOAT_MAT2x4, "mat2x4", GL_FLOAT_MAT3x2, "mat3x2", GL_FLOAT_MAT3x4, "mat3x4", GL_FLOAT_MAT4x2, "mat4x2", GL_FLOAT_MAT4x3, "mat4x3", GL_DOUBLE_MAT2, "dmat2", GL_DOUBLE_MAT3, "dmat3", GL_DOUBLE_MAT4, "dmat4", GL_DOUBLE_MAT2x3, "dmat2x3", GL_DOUBLE_MAT2x4, "dmat2x4", GL_DOUBLE_MAT3x2, "dmat3x2", GL_DOUBLE_MAT3x4, "dmat3x4", GL_DOUBLE_MAT4x2, "dmat4x2", GL_DOUBLE_MAT4x3, "dmat4x3", GL_SAMPLER_1D, "sampler1D", GL_SAMPLER_2D, "sampler2D", GL_SAMPLER_3D, "sampler3D", GL_SAMPLER_CUBE, "samplerCube", GL_SAMPLER_1D_SHADOW, "sampler1DShadow", GL_SAMPLER_2D_SHADOW, "sampler2DShadow", GL_SAMPLER_1D_ARRAY, "sampler1DArray", GL_SAMPLER_2D_ARRAY, "sampler2DArray", GL_SAMPLER_1D_ARRAY_SHADOW, "sampler1DArrayShadow", GL_SAMPLER_2D_ARRAY_SHADOW, "sampler2DArrayShadow", GL_SAMPLER_2D_MULTISAMPLE, "sampler2DMS", GL_SAMPLER_2D_MULTISAMPLE_ARRAY, "sampler2DMSArray", GL_SAMPLER_CUBE_SHADOW, "samplerCubeShadow", GL_SAMPLER_BUFFER, "samplerBuffer", GL_SAMPLER_2D_RECT, "sampler2DRect", GL_SAMPLER_2D_RECT_SHADOW, "sampler2DRectShadow", GL_INT_SAMPLER_1D, "isampler1D", GL_INT_SAMPLER_2D, "isampler2D", GL_INT_SAMPLER_3D, "isampler3D", GL_INT_SAMPLER_CUBE, "isamplerCube", GL_INT_SAMPLER_1D_ARRAY, "isampler1DArray", GL_INT_SAMPLER_2D_ARRAY, "isampler2DArray", GL_INT_SAMPLER_2D_MULTISAMPLE, "isampler2DMS", GL_INT_SAMPLER_2D_MULTISAMPLE_ARRAY, "isampler2DMSArray", GL_INT_SAMPLER_BUFFER, "isamplerBuffer", GL_INT_SAMPLER_2D_RECT, "isampler2DRect", GL_UNSIGNED_INT_SAMPLER_1D, "usampler1D", GL_UNSIGNED_INT_SAMPLER_2D, "usampler2D", GL_UNSIGNED_INT_SAMPLER_3D, "usampler3D", GL_UNSIGNED_INT_SAMPLER_CUBE, "usamplerCube", GL_UNSIGNED_INT_SAMPLER_1D_ARRAY, "usampler2DArray", GL_UNSIGNED_INT_SAMPLER_2D_ARRAY, "usampler2DArray", GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE, "usampler2DMS", GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE_ARRAY, "usampler2DMSArray", GL_UNSIGNED_INT_SAMPLER_BUFFER, "usamplerBuffer", GL_UNSIGNED_INT_SAMPLER_2D_RECT, "usampler2DRect", GL_IMAGE_1D, "image1D", GL_IMAGE_2D, "image2D", GL_IMAGE_3D, "image3D", GL_IMAGE_2D_RECT, "image2DRect", GL_IMAGE_CUBE, "imageCube", GL_IMAGE_BUFFER, "imageBuffer", GL_IMAGE_1D_ARRAY, "image1DArray", GL_IMAGE_2D_ARRAY, "image2DArray", GL_IMAGE_2D_MULTISAMPLE, "image2DMS", GL_IMAGE_2D_MULTISAMPLE_ARRAY, "image2DMSArray", GL_INT_IMAGE_1D, "iimage1D", GL_INT_IMAGE_2D, "iimage2D", GL_INT_IMAGE_3D, "iimage3D", GL_INT_IMAGE_2D_RECT, "iimage2DRect", GL_INT_IMAGE_CUBE, "iimageCube", GL_INT_IMAGE_BUFFER, "iimageBuffer", GL_INT_IMAGE_1D_ARRAY, "iimage1DArray", GL_INT_IMAGE_2D_ARRAY, "iimage2DArray", GL_INT_IMAGE_2D_MULTISAMPLE, "iimage2DMS", GL_INT_IMAGE_2D_MULTISAMPLE_ARRAY, "iimage2DMSArray", GL_UNSIGNED_INT_IMAGE_1D, "uimage1D", GL_UNSIGNED_INT_IMAGE_2D, "uimage2D", GL_UNSIGNED_INT_IMAGE_3D, "uimage3D", GL_UNSIGNED_INT_IMAGE_2D_RECT, "uimage2DRect", GL_UNSIGNED_INT_IMAGE_CUBE, "uimageCube", GL_UNSIGNED_INT_IMAGE_BUFFER, "uimageBuffer", GL_UNSIGNED_INT_IMAGE_1D_ARRAY, "uimage1DArray", GL_UNSIGNED_INT_IMAGE_2D_ARRAY, "uimage2DArray", GL_UNSIGNED_INT_IMAGE_2D_MULTISAMPLE, "uimage2DMS", GL_UNSIGNED_INT_IMAGE_2D_MULTISAMPLE_ARRAY, "uimage2DMSArray", GL_UNSIGNED_INT_ATOMIC_COUNTER, "atomic_uint" };Code to enumerate all ACTIVE uniforms in a program:
void eTB_GLSL__print_uniforms (GLuint program) { GLint uniform_count; glGetProgramiv (program, GL_ACTIVE_UNIFORMS, &uniform_count); GLchar name [256]; for (GLint i = 0; i < uniform_count; i++) { memset (name, '\0', 256); GLint size; GLenum type; glGetActiveUniform (program, i, 255, NULL, &size, &type, name); GLint location = glGetUniformLocation (program, name); for (int j = 0; j < sizeof (type_set) / sizeof (glsl_type_set); j++) { if (type_set [j].type != type) continue; const char* type_name = type_set [j].name; if (size > 1) printf ( "Uniform %d (loc=%d):\t%20s %-20s <Size: %d>\n", i, location, type_name, name, size ); else printf ( "Uniform %d (loc=%d):\t%20s %-20s\n", i, location, type_name, name ); break; } if (i == (uniform_count - 1)) printf ("\n"); } }Sample Output (AMD):
Uniform 0 (loc=0): float buffer_res_x Uniform 1 (loc=1): float buffer_res_y Uniform 2 (loc=2): float buffer_scale Uniform 3 (loc=3): mat4 camera_matrix Uniform 4 (loc=4): bool fxaa Uniform 5 (loc=5): vec3 light_colors <Size: 128> Uniform 6 (loc=133): vec3 light_pos <Size: 128> Uniform 7 (loc=261): mat4 modelview_mat Uniform 8 (loc=262): int num_lights Uniform 9 (loc=263): sampler2D depth_buffer Uniform 10 (loc=264): sampler2D diffuse_buffer Uniform 11 (loc=265): sampler2D normal_buffer Uniform 12 (loc=266): samplerCube shadow_buffer <Size: 10>Sample Output (NV):
Uniform 0 (loc=0): float buffer_res_x Uniform 1 (loc=1): float buffer_res_y Uniform 2 (loc=2): float buffer_scale Uniform 3 (loc=3): mat4 camera_matrix Uniform 4 (loc=4): bool fxaa Uniform 5 (loc=5): vec3 light_colors[0] <Size: 128> Uniform 6 (loc=133): vec3 light_pos[0] <Size: 128> Uniform 7 (loc=261): mat4 modelview_mat Uniform 8 (loc=262): int num_lights Uniform 9 (loc=263): sampler2D depth_buffer Uniform 10 (loc=264): sampler2D diffuse_buffer Uniform 11 (loc=265): sampler2D normal_buffer Uniform 12 (loc=266): samplerCube shadow_buffer[0] <Size: 10>I chose this particular shader because it is the first one I could find that demonstrates how NV and AMD differ when reporting uniform names for arrays, there is nothing particularly special about it. NV always uses
[0]notation and AMD does not (newer drivers tend to, however). You can still query individual uniform locations provided they are within the range indicated by <Size: X>. That is to say that while the driver will enumerate them asname[0]orname, it is technically valid to query the uniform location fornameorname[0]in either implementation.I would be very interested in seeing three things:
- The output of this after linking on your AMD hardware
- The output of this after linking on your NV hardware
- Your full shader
With these three things, an actual answer should be possible.
UPDATE
I believe the GLSL compiler is having a hard time determining usage because of the way the shader is written, to confirm this, try replacing:
vec3 computeLight(int light_index){ Light light = lights[light_index]; if(light.position == vec4(0.0)) { return vec3(0.0);} if(light.position.w == 0.0 ) {return directionLight(light);} if(light.cutoff == 0) {return pointLight(light);} return reflectionLight(light); } [...] vec3 lighting = vec3(0.); for(int i = 0; i < lights_no; i++) { lighting += computeLight(i); }With something much uglier like:
vec3 lighting = vec3(0.0); for(int i = 0; i < lights_no; i++) { Light light = lights [i]; if (light.position != vec4 (0.0)) { if (light.position.w == 0.0) lighting += directionLight(light); else if (light.cutoff == 0.0) lighting += pointLight(light); else lighting += reflectionLight (light); } } }讨论(0)
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