From 26abe443363c9fc95834bdf9a6a2649bd1f9e15a Mon Sep 17 00:00:00 2001
From: Luke Benstead <kazade@gmail.com>
Date: Sun, 18 Oct 2020 22:01:45 +0100
Subject: [PATCH] Don't submit dead vertices

---
 GL/clip.c    |  3 +--
 GL/flush.c   | 27 ++++++++++++++++-----------
 GL/private.h |  2 ++
 3 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/GL/clip.c b/GL/clip.c
index 2b18e5a..64323a2 100644
--- a/GL/clip.c
+++ b/GL/clip.c
@@ -165,7 +165,7 @@ void _glClipTriangle(const Triangle* triangle, const uint8_t visible, Submission
 }
 
 static inline void markDead(Vertex* vert) {
-    vert->flags = VERTEX_CMD_EOL;
+    vert->flags = DEAD; //VERTEX_CMD_EOL;
 
     // If we're debugging, wipe out the xyz
 #ifndef NDEBUG
@@ -331,7 +331,6 @@ void _glClipTriangleStrip(SubmissionTarget* target, uint8_t fladeShade) {
                     triangle = -1;
                 } else {
                     Vertex* v4 = v3 + 1;
-                    uint32_t vi4 = v4 - start;
 
                     TO_CLIP[CLIP_COUNT].vertex[0] = *v3;
                     TO_CLIP[CLIP_COUNT].vertex[1] = *v2;
diff --git a/GL/flush.c b/GL/flush.c
index e06b13c..847c5b1 100644
--- a/GL/flush.c
+++ b/GL/flush.c
@@ -24,17 +24,22 @@ static void pvr_list_submit(void *src, int n) {
     /* fill/write queues as many times necessary */
     while(n--) {
         __asm__("pref @%0" : : "r"(s + STRIDE));  /* prefetch 64 bytes for next loop */
-        d[0] = *(s++);
-        d[1] = *(s++);
-        d[2] = *(s++);
-        d[3] = *(s++);
-        d[4] = *(s++);
-        d[5] = *(s++);
-        d[6] = *(s++);
-        d[7] = *(s++);
-        __asm__("pref @%0" : : "r"(d));
-        d += 8;
-        s += (STRIDE - 8);
+        if(*s != DEAD) {
+            d[0] = *(s++);
+            d[1] = *(s++);
+            d[2] = *(s++);
+            d[3] = *(s++);
+            d[4] = *(s++);
+            d[5] = *(s++);
+            d[6] = *(s++);
+            d[7] = *(s++);
+
+            __asm__("pref @%0" : : "r"(d));
+            d += 8;
+            s += (STRIDE - 8);
+        } else {
+            s += 16;
+        }
     }
 
     /* Wait for both store queues to complete */
diff --git a/GL/private.h b/GL/private.h
index a0a0f59..cdcb513 100644
--- a/GL/private.h
+++ b/GL/private.h
@@ -192,6 +192,8 @@ typedef struct {
     GLfloat specularMaterial[4];
 } LightSource;
 
+#define DEAD 0xDEADBEEF
+
 typedef struct {
     /* Same 32 byte layout as pvr_vertex_t */
     uint32_t flags;