opengl render backend

src/render/render_core.c

@@ -6,6 +6,33 @@
 
 #include "generated/render.meta.c"
 
+////////////////////////////////
+//~ rjf: Helpers
+
+internal Mat4x4F32
+r_sample_channel_map_from_tex2dformat(R_Tex2DFormat fmt)
+{
+  Mat4x4F32 result =
+  {
+    {
+      {1, 0, 0, 0},
+      {0, 1, 0, 0},
+      {0, 0, 1, 0},
+      {0, 0, 0, 1},
+    }
+  };
+  switch(fmt)
+  {
+    default:{}break;
+    case R_Tex2DFormat_R8:
+    {
+      MemoryZeroArray(result.v[0]);
+      result.v[0][0] = result.v[0][1] = result.v[0][2] = result.v[0][3] = 1.f;
+    }break;
+  }
+  return result;
+}
+
 ////////////////////////////////
 //~ rjf: Basic Type Functions