Copied cubemap_lib to eevee-next

Note that this is WIP as we want to use ortahedron maps before we
continue with the packing solution.

@@ -73,1 +75,4 @@
 
+/* LightProbe->bake_resolution, World->bake_resolution. */
+typedef enum eLightProbeBakeResolution {
+  LIGHT_PROBE_BAKE_RESOLUTION_64 = 6,

@@ -1025,0 +1038,4 @@
+   * TODO: remove this attribute when baking has been implemented.
+   * NOTE: alpha channel is not used, but here for alignment reasons.
+   */
+  float4 color;

@@ -1025,0 +1041,4 @@
+  float4 color;
+  packed_float3 pos;
+
+  /** On which layer of the cubemaps array is this reflection probe stored. */

@@ -1025,0 +1067,4 @@
+  /**
+   * Artistic control to change the intensity during evaluation phase.
+   */
+  float intensity;

@@ -10,14 +10,23 @@
  * \{ */
 
 GPU_SHADER_CREATE_INFO(eevee_reflection_probe_data)
+    .storage_buf(REFLECTION_PROBE_BUF_SLOT,

@@ -74,0 +81,4 @@
+  LIGHT_PROBE_BAKE_RESOLUTION_512 = 9,
+  LIGHT_PROBE_BAKE_RESOLUTION_1024 = 10,
+  LIGHT_PROBE_BAKE_RESOLUTION_2048 = 11,
+  LIGHT_PROBE_BAKE_RESOLUTION_4096 = 12,

@@ -34,0 +73,4 @@
+                     (1.0 - 2.0 * REFLECTION_PROBE_BORDER_SIZE * texel_size);
+
+  /* Mirror until the coordinates fit. */
+  /* Fix right side. */

@@ -289,0 +296,4 @@
+
+    if (!DNA_struct_elem_find(fd->filesdna, "World", "int", "bake_resolution")) {
+      LISTBASE_FOREACH (World *, world, &bmain->worlds) {
+        world->bake_resolution = LIGHT_PROBE_BAKE_RESOLUTION_1024;

@@ -30,1 +30,4 @@
+#define REFLECTION_PROBES_MAX 256
 #define REFLECTION_PROBE_GROUP_SIZE 16
+/* Number of additional pixels on the border of an octahedral map to reserve for fixing leakage.*/
+#define REFLECTION_PROBE_BORDER_SIZE 16.0

@@ -1025,0 +1027,4 @@
+ * \{ */
+
+/** Mapping data to locate a reflection probe in texture. */
+struct ReflectionProbeData {

@@ -1025,0 +1061,4 @@
+};
+BLI_STATIC_ASSERT_ALIGN(ReflectionProbeData, 16)
+
+struct ReflectionProbeBuffer {

@@ -34,2 +59,4 @@
     pass.bind_texture("cubemap_tx", cubemap_tx_);
     pass.bind_image("octahedral_img", probes_tx_);
+    pass.bind_ssbo(REFLECTION_PROBE_BUF_SLOT, data_buf_);
+    /* TODO this should be added in a subpass with the correct resolution to reduce overshooting

@@ -39,0 +188,4 @@
+}
+
+/**
+ * Utility class to find a location in the cubemap that can be used to store a new probe cubemap in

@@ -39,0 +301,4 @@
+  bool regenerate_mipmaps_postponed = false;
+
+  for (ReflectionProbe &cubemap : probes_) {
+    cubemap.is_dirty |= resize_layers;

@@ -39,0 +384,4 @@
+}
+
+/* -------------------------------------------------------------------- */
+/** \name World

@@ -28,0 +32,4 @@
+
+  Type type = Type::Unused;
+
+  bool is_dirty = false;

@@ -28,0 +53,4 @@
+   */
+  int index = -1;
+
+  bool needs_update() const;

@@ -39,2 +70,4 @@
 
   Instance &instance_;
+  ReflectionProbeDataBuf data_buf_;
+  Vector<ReflectionProbe> probes_;

@@ -215,6 +215,7 @@ void CaptureView::render()
     view.sync(view_m4, win_m4);
     inst_.pipelines.world.render(view);
   }
+  GPU_texture_update_mipmap_chain(inst_.reflection_probes.cubemap_tx_);

@@ -58,3 +64,1 @@
-     * the reflection probe patch. */
-    const float intensity_factor = 1.0;
-    out_specular += vec3(intensity_factor * l_col);
+  /* ReflectionProbeData doesn't contain any gabs, exit at first item that is invalid. */

@@ -28,0 +45,4 @@
+  /**
+   * Probes that aren't used during a draw can be cleared.
+   */
+  bool is_used = false;