Speed up the histogram counting immensely by adding via local memory.

[narabu] / narabu-encoder.cpp

diff --git a/narabu-encoder.cpp b/narabu-encoder.cpp
index e8d20e042af141d2f404c3f4a676bd463ea4918b..730135978c34c3bb604bcad6d3b893df0b2e7d16 100644 (file)
--- a/narabu-encoder.cpp
+++ b/narabu-encoder.cpp
@@ -401,7 +401,7 @@ int main(int argc, char **argv)
        steady_clock::time_point start = steady_clock::now();
        unsigned num_iterations = 100;
        for (unsigned i = 0; i < num_iterations; ++i) {
-               glDispatchCompute(WIDTH_BLOCKS, HEIGHT_BLOCKS, 1);
+               glDispatchCompute(WIDTH_BLOCKS / 16, HEIGHT_BLOCKS, 1);
        }
        check_error();
        glFinish();