add comments

1 files changed, 7 insertions, 0 deletions

diff --git a/main.c b/main.c
index 6f620b5..2573d4c 100644
--- a/main.c
+++ b/main.c
@@ -260,11 +260,14 @@ update_particles(
 ) {
   if (USE_COMPUTE_SHADER) {
     UNUSED(ssbo);
+
     glUseProgram(compute_prog);
     glDispatchCompute(NUM_PARTICLES / WORKGROUP_SIZE, 1, 1);
     glMemoryBarrier(GL_SHADER_STORAGE_BARRIER_BIT);
   } else {
     UNUSED(compute_prog);
+
+    // bind shader storage buffer
     glBindBuffer(GL_SHADER_STORAGE_BUFFER, ssbo);
 
     // map buffer
@@ -275,8 +278,10 @@ update_particles(
       GL_MAP_READ_BIT | GL_MAP_WRITE_BIT
     );
 
+    // update particle positions
     #pragma omp parallel for
     for (int i = 0; i < NUM_PARTICLES; i++) {
+      // update x coordinate
       data[4 * i + 0] += 0.016 * data[4 * (NUM_PARTICLES + i) + 0];
       if (data[4 * i + 0] < -1.1) {
         data[4 * i + 0] += 2.2;
@@ -284,6 +289,7 @@ update_particles(
         data[4 * i + 0] -= 2.2;
       }
 
+      // update y coordinate
       data[4 * i + 1] += 0.016 * data[4 * (NUM_PARTICLES + i) + 1];
       if (data[4 * i + 1] < -1.1) {
         data[4 * i + 1] += 2.2;
@@ -292,6 +298,7 @@ update_particles(
       }
     }
 
+    // unmap and unbind data buffer
     glUnmapBuffer(GL_SHADER_STORAGE_BUFFER);
     glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
   }