Replaced FRAME_LAG with swapchain.num_images - 1 to be generic

The frame lag is equal to the num of remaining frames (in case of 3ple
buffering it's 2, if we use double buffering it's 1) so, I am not
defining it anymore.

diff --git a/src/main.cc b/src/main.cc
index bcbc2ac..6c3d70d 100644 (file)
--- a/src/main.cc
+++ b/src/main.cc
@@ -19,7 +19,6 @@
 #include "camera.h"
 
 /* defines */
-#define FRAME_LAG 2
 #define FENCE_TIMEOUT UINT64_MAX
 
 /**************************/
@@ -100,7 +99,7 @@ static std::vector<VkFramebuffer>vk_framebuffers;
 /* for the moment: one cmd buffer per swapchain image */
 static std::vector<VkCommandBuffer>vk_cmd_buffers;
 static std::vector<VkFence>vk_fences;
-static struct vk_semaphores vk_semas[FRAME_LAG];
+static struct vk_semaphores *vk_semas;
 
 /* FIXME make them part of each object's functions/params */
 static struct vk_renderer vk_rnd;
@@ -387,7 +386,7 @@ display()
         abort();
     }
 
-    vk_frame_idx = (vk_frame_idx + 1) % FRAME_LAG;
+    vk_frame_idx = (vk_frame_idx + 1) % (vk_chain.num_images - 1);
 
     printf("display %d\n", count++);
     printf("current image %u\n", vk_current_image);
@@ -397,6 +396,8 @@ display()
 static void
 vk_cleanup()
 {
+    int num_images = vk_chain.num_images - 1;
+
     vk_destroy_image(&vk_core, &vk_depth_att.obj);
     vk_destroy_renderer(&vk_core, &vk_rnd);
 
@@ -421,8 +422,9 @@ vk_cleanup()
     vk_destroy_fences(&vk_core, vk_fences.size(), vk_fences.data());
     vk_fences.clear();
 
-    for (int i = 0; i < FRAME_LAG; i++)
+    for (int i = 0; i < num_images; i++)
         vk_destroy_semaphores(&vk_core, &vk_semas[i]);
+    free(vk_semas);
 
     for (size_t i = 0; i < vk_cmd_buffers.size(); i++)
         vk_destroy_cmd_buffers(&vk_core, vk_cmd_buffers.size(), vk_cmd_buffers.data());
@@ -445,9 +447,10 @@ vk_create_sync_objects()
     memset(&sinfo, 0, sizeof sinfo);
     sinfo.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;
 
-    vk_fences.resize(FRAME_LAG, VK_NULL_HANDLE);
+    vk_fences.resize(vk_chain.num_images - 1, VK_NULL_HANDLE);
 
-    for (int i = 0; i < FRAME_LAG; i++) {
+    vk_semas = (vk_semaphores *)malloc(sizeof(vk_semaphores) * (vk_chain.num_images - 1));
+    for (uint32_t i = 0; i < (vk_chain.num_images - 1); i++) {
         if (vkCreateFence(vk_core.dev, &finfo, 0, &vk_fences[i]) != VK_SUCCESS) {
             fprintf(stderr, "Failed to create fence: %d\n", i);
             return false;