From 9d6a2d71e4c8c3bb5ef8d9088a5cec985f869b9b Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Fri, 4 Jul 2025 17:27:11 -0700
Subject: Refactor scene renderer to use the LLR

---
 src/llr/llr.c | 42 +++++++++++++++++++++++++-----------------
 1 file changed, 25 insertions(+), 17 deletions(-)

(limited to 'src/llr/llr.c')

diff --git a/src/llr/llr.c b/src/llr/llr.c
index 746f4b3..74cfaed 100644
--- a/src/llr/llr.c
+++ b/src/llr/llr.c
@@ -171,6 +171,9 @@ static void configure_state(LLR* renderer) {
     gfx_set_mat4_uniform(shader, "ViewProjection", &view_proj);
     gfx_set_mat4_uniform(shader, "MVP", &mvp);
     gfx_set_vec3_uniform(shader, "CameraPosition", renderer->camera_position);
+    gfx_set_mat4_uniform(shader, "CameraRotation", &renderer->camera_rotation);
+    gfx_set_float_uniform(shader, "Fovy", renderer->fovy);
+    gfx_set_float_uniform(shader, "Aspect", renderer->aspect);
   }
 
   if (renderer->lights_changed || renderer->shader_changed) {
@@ -188,9 +191,11 @@ static void configure_state(LLR* renderer) {
   if (renderer->skeleton_changed || renderer->shader_changed) {
     renderer->skeleton_changed = false;
 
-    gfx_set_mat4_array_uniform(
-        shader, "JointMatrices", renderer->joint_matrices,
-        renderer->num_joints);
+    if (renderer->num_joints > 0) {
+      gfx_set_mat4_array_uniform(
+          shader, "JointMatrices", renderer->joint_matrices,
+          renderer->num_joints);
+    }
   }
 
   if (renderer->shader_changed) {
@@ -211,6 +216,9 @@ bool gfx_llr_make(LLR* renderer, GfxCore* gfxcore) {
     goto cleanup;
   }
   gfx_llr_load_identity(renderer);
+  renderer->view            = mat4_id();
+  renderer->projection      = mat4_id();
+  renderer->camera_rotation = mat4_id();
   return true;
 
 cleanup:
@@ -278,7 +286,7 @@ void gfx_llr_set_skeleton(
   renderer->skeleton_changed = true;
 }
 
-void gfx_llr_unset_skeleton(LLR* renderer) {
+void gfx_llr_clear_skeleton(LLR* renderer) {
   assert(renderer);
 
   renderer->num_joints       = 0;
@@ -288,22 +296,22 @@ void gfx_llr_unset_skeleton(LLR* renderer) {
 void gfx_llr_set_camera(LLR* renderer, const Camera* camera) {
   assert(renderer);
 
-  const mat4 view = spatial3_inverse_transform(&camera->spatial);
-  // const mat4 view_proj = mat4_mul(camera->projection, view);
-  // gfx_llr_set_view_projection_matrix(renderer, &view_proj);
-  renderer->view           = view;
-  renderer->projection     = camera->projection;
+  renderer->camera_position = camera->spatial.p;
+  renderer->camera_rotation =
+      mat4_rotation(spatial3_transform(&camera->spatial));
+  renderer->view       = spatial3_inverse_transform(&camera->spatial);
+  renderer->projection = camera->projection;
+  // Assuming a perspective matrix.
+  renderer->fovy = (R)atan(1.0 / (mat4_at(camera->projection, 1, 1))) * 2;
   renderer->camera_changed = true;
 }
 
-// void gfx_llr_set_view_projection_matrix(
-//     LLR* renderer, const mat4* view_proj) {
-//   assert(renderer);
-//   assert(renderer->shader);
-//
-//   gfx_llr_flush(renderer);
-//   gfx_set_mat4_uniform(renderer->shader, "ViewProjection", view_proj);
-// }
+void gfx_llr_set_aspect(LLR* renderer, float aspect) {
+  assert(renderer);
+
+  renderer->aspect         = aspect;
+  renderer->camera_changed = true;
+}
 
 void gfx_llr_render_geometry(LLR* renderer, const Geometry* geometry) {
   assert(renderer);
-- 
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