From ef284a15a1ab8ca48087175d24df0dc06d0b3415 Mon Sep 17 00:00:00 2001
From: Dominic Masters <dominic@domsplace.com>
Date: Wed, 8 Jul 2026 12:36:40 -0500
Subject: [PATCH] pre-cache shader matrices

---
 src/dusk/scene/scene.c | 45 ++++++++++++++++++++++++------------------
 src/dusk/scene/scene.h |  4 ++++
 2 files changed, 30 insertions(+), 19 deletions(-)

diff --git a/src/dusk/scene/scene.c b/src/dusk/scene/scene.c
index f078a8f7..72c4e9d9 100644
--- a/src/dusk/scene/scene.c
+++ b/src/dusk/scene/scene.c
@@ -58,6 +58,23 @@ errorret_t sceneUpdate(void) {
 }
 
 errorret_t sceneRender(void) {
+  // Setup screen matrices for 3D rendering.
+  glm_mat4_identity(SCENE.screenIdentity);
+  
+  glm_ortho(
+    0.0f, (float_t)(SCREEN.width / SCREEN.scaleUi),
+    (float_t)(SCREEN.height / SCREEN.scaleUi), 0.0f,
+    0.1f, 100.0f,
+    SCENE.screenProj
+  );
+
+  glm_lookat(
+    (vec3){ 0.0f, 0.0f, 1.0f },
+    (vec3){ 0.0f, 0.0f, 0.0f },
+    (vec3){ 0.0f, 1.0f, 0.0f },
+    SCENE.screenView
+  );
+
   // Scene rendering
   if(
     SCENE.current != SCENE_TYPE_NULL &&
@@ -67,26 +84,16 @@ errorret_t sceneRender(void) {
   }
   
   // UI Rendering
-  mat4 proj, view, ident;
-  glm_mat4_identity(ident);
   errorChain(shaderBind(&SHADER_UNLIT));
-  errorChain(shaderSetMatrix(&SHADER_UNLIT, SHADER_UNLIT_MODEL, ident));
-
-  glm_ortho(
-    0.0f, (float_t)(SCREEN.width / SCREEN.scaleUi),
-    (float_t)(SCREEN.height / SCREEN.scaleUi), 0.0f,
-    0.1f, 100.0f,
-    proj
-  );
-  errorChain(shaderSetMatrix(&SHADER_UNLIT, SHADER_UNLIT_PROJECTION, proj));
-
-  glm_lookat(
-    (vec3){ 0.0f, 0.0f, 1.0f },
-    (vec3){ 0.0f, 0.0f, 0.0f },
-    (vec3){ 0.0f, 1.0f, 0.0f },
-    view
-  );
-  errorChain(shaderSetMatrix(&SHADER_UNLIT, SHADER_UNLIT_VIEW, view));
+  errorChain(shaderSetMatrix(
+    &SHADER_UNLIT, SHADER_UNLIT_MODEL, SCENE.screenIdentity
+  ));
+  errorChain(shaderSetMatrix(
+    &SHADER_UNLIT, SHADER_UNLIT_PROJECTION, SCENE.screenProj
+  ));
+  errorChain(shaderSetMatrix(
+    &SHADER_UNLIT, SHADER_UNLIT_VIEW, SCENE.screenView
+  ));
 
   errorChain(displaySetState((displaystate_t){
     .flags = DISPLAY_STATE_FLAG_BLEND
diff --git a/src/dusk/scene/scene.h b/src/dusk/scene/scene.h
index b3cd8168..db138699 100644
--- a/src/dusk/scene/scene.h
+++ b/src/dusk/scene/scene.h
@@ -6,12 +6,16 @@
  */
 
 #pragma once
+#include "dusk.h"
 #include "scenetype.h"
 
 typedef struct {
   scenetype_t current;
   scenetype_t next;
   scenedata_t data;
+  mat4 screenProj;
+  mat4 screenView;
+  mat4 screenIdentity;
 } scene_t;
 
 extern scene_t SCENE;