From 42b5f1997cdd5e99645e24dca6cb89cc7b081a09 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 1 Nov 2025 18:23:08 -0700
Subject: Add support for alpha mode

---
 src/render/llr.c | 36 ++++++++++++++++++++++++++++--------
 1 file changed, 28 insertions(+), 8 deletions(-)

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

diff --git a/src/render/llr.c b/src/render/llr.c
index 76935f9..c9c6d34 100644
--- a/src/render/llr.c
+++ b/src/render/llr.c
@@ -54,7 +54,9 @@ static void material_make(Material* material, const MaterialDesc* desc) {
   assert(material);
   assert(desc);
   assert(desc->num_uniforms < GFX_MAX_UNIFORMS_PER_MATERIAL);
-  material->num_uniforms = desc->num_uniforms;
+  material->alpha_mode   = desc->alpha_mode;
+  material->alpha_cutoff = desc->alpha_cutoff;
+  material->num_uniforms = (int8_t)desc->num_uniforms;
   for (int i = 0; i < desc->num_uniforms; ++i) {
     material->uniforms[i] = desc->uniforms[i];
   }
@@ -69,22 +71,27 @@ Material* gfx_make_material(const MaterialDesc* desc) {
 
 void gfx_destroy_material(Material** material) { mem_free_material(material); }
 
+// TODO: Move this to core/shader_program.
 static void set_uniform(ShaderProgram* prog, const ShaderUniform* uniform) {
   switch (uniform->type) {
-  case UniformTexture:
-    gfx_set_texture_uniform(prog, uniform->name.str, uniform->value.texture);
+  case UniformInt:
+    gfx_set_int_uniform(prog, uniform->name.str, uniform->value.uniform_int);
+    break;
+  case UniformFloat:
+    gfx_set_float_uniform(
+        prog, uniform->name.str, uniform->value.uniform_float);
     break;
   case UniformMat4:
-    gfx_set_mat4_uniform(prog, uniform->name.str, &uniform->value.mat4);
+    gfx_set_mat4_uniform(prog, uniform->name.str, &uniform->value.uniform_mat4);
     break;
   case UniformVec3:
-    gfx_set_vec3_uniform(prog, uniform->name.str, uniform->value.vec3);
+    gfx_set_vec3_uniform(prog, uniform->name.str, uniform->value.uniform_vec3);
     break;
   case UniformVec4:
-    gfx_set_vec4_uniform(prog, uniform->name.str, uniform->value.vec4);
+    gfx_set_vec4_uniform(prog, uniform->name.str, uniform->value.uniform_vec4);
     break;
-  case UniformFloat:
-    gfx_set_float_uniform(prog, uniform->name.str, uniform->value.scalar);
+  case UniformTexture:
+    gfx_set_texture_uniform(prog, uniform->name.str, uniform->value.texture);
     break;
   case UniformMat4Array:
     gfx_set_mat4_array_uniform(
@@ -104,6 +111,19 @@ static void gfx_material_activate(
     const ShaderUniform* uniform = &material->uniforms[i];
     set_uniform(shader, uniform);
   }
+  if (material->alpha_mode != Opaque) {
+    set_uniform(
+        shader, &(ShaderUniform){.name              = sstring_make("AlphaMode"),
+                                 .type              = UniformInt,
+                                 .value.uniform_int = material->alpha_mode});
+  }
+  if (material->alpha_mode == Mask) {
+    set_uniform(
+        shader,
+        &(ShaderUniform){.name                = sstring_make("AlphaCutoff"),
+                         .type                = UniformFloat,
+                         .value.uniform_float = material->alpha_cutoff});
+  }
 }
 
 static void mesh_make(Mesh* mesh, const MeshDesc* desc) {
-- 
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