From 5767702aa5456b6f52273b9667aebc4ec02961e3 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 25 Aug 2012 22:28:05 +0300
Subject: [PATCH] Don't query array/matrix stride for uniforms which are not
 arrays/matrices

---
 source/program.cpp | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/source/program.cpp b/source/program.cpp
index ffcc4a6c..a2688507 100644
--- a/source/program.cpp
+++ b/source/program.cpp
@@ -297,9 +297,12 @@ void Program::link()
 			for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
 				if(uniforms_by_index[*j]->size>1)
 					indices2.push_back(*j);
-			glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_ARRAY_STRIDE, &values[0]);
-			for(unsigned j=0; j<indices2.size(); ++j)
-				uniforms_by_index[indices[j]]->array_stride = values[j];
+			if(!indices2.empty())
+			{
+				glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_ARRAY_STRIDE, &values[0]);
+				for(unsigned j=0; j<indices2.size(); ++j)
+					uniforms_by_index[indices[j]]->array_stride = values[j];
+			}
 
 			indices2.clear();
 			for(vector<int>::iterator j=indices.begin(); j!=indices.end(); ++j)
@@ -310,9 +313,12 @@ void Program::link()
 					t==GL_FLOAT_MAT3x4 || t==GL_FLOAT_MAT4x2 || t==GL_FLOAT_MAT4x3)
 					indices2.push_back(*j);
 			}
-			glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_MATRIX_STRIDE, &values[0]);
-			for(unsigned j=0; j<indices2.size(); ++j)
-				uniforms_by_index[indices[j]]->matrix_stride = values[j];
+			if(!indices2.empty())
+			{
+				glGetActiveUniformsiv(id, indices2.size(), &indices2[0], GL_UNIFORM_MATRIX_STRIDE, &values[0]);
+				for(unsigned j=0; j<indices2.size(); ++j)
+					uniforms_by_index[indices[j]]->matrix_stride = values[j];
+			}
 
 			info.layout_hash = compute_layout_hash(info.uniforms);
 			info.bind_point = info.layout_hash%BufferRange::get_n_uniform_buffer_bindings();
-- 
2.45.2