1 files changed, 161 insertions, 0 deletions

diff --git a/src/util/skyquad.c b/src/util/skyquad.c
new file mode 100644
index 0000000..08fa044
--- /dev/null
+++ b/src/util/skyquad.c
@@ -0,0 +1,161 @@
+#include <gfx/util/skyquad.h>
+
+#include <gfx/core.h>
+#include <gfx/gfx.h>
+#include <gfx/scene/light.h>
+#include <gfx/scene/material.h>
+#include <gfx/scene/mesh.h>
+#include <gfx/scene/node.h>
+#include <gfx/scene/object.h>
+#include <gfx/scene/scene.h>
+#include <gfx/util/geometry.h>
+#include <gfx/util/shader.h>
+
+#include <math/vec4.h>
+
+#include <assert.h>
+
+SceneObject* gfx_make_skyquad(GfxCore* gfxcore, const Texture* texture) {
+  assert(gfxcore);
+  assert(texture);
+
+  ShaderProgram* shader   = 0;
+  Geometry*      geometry = 0;
+  Material*      material = 0;
+  Mesh*          mesh     = 0;
+  SceneObject*   object   = 0;
+
+  shader = gfx_make_skyquad_shader(gfxcore);
+  if (!shader) {
+    goto cleanup;
+  }
+
+  geometry = gfx_make_quad_11(gfxcore);
+  if (!geometry) {
+    goto cleanup;
+  }
+
+  MaterialDesc material_desc = (MaterialDesc){0};
+  material_desc.uniforms[0]  = (ShaderUniform){
+       .type          = UniformTexture,
+       .value.texture = texture,
+       .name          = sstring_make("Skyquad")};
+  material_desc.num_uniforms = 1;
+  material                   = gfx_make_material(&material_desc);
+  if (!material) {
+    goto cleanup;
+  }
+
+  MeshDesc mesh_desc = (MeshDesc){0};
+  mesh_desc.geometry = geometry;
+  mesh_desc.material = material;
+  mesh_desc.shader   = shader;
+  mesh               = gfx_make_mesh(&mesh_desc);
+  if (!mesh) {
+    goto cleanup;
+  }
+
+  object = gfx_make_object(&(ObjectDesc){.num_meshes = 1, .meshes = {mesh}});
+  if (!object) {
+    goto cleanup;
+  }
+
+  return object;
+
+cleanup:
+  if (shader) {
+    gfx_destroy_shader_program(gfxcore, &shader);
+  }
+  if (geometry) {
+    gfx_destroy_geometry(gfxcore, &geometry);
+  }
+  if (material) {
+    gfx_destroy_material(&material);
+  }
+  if (mesh) {
+    gfx_destroy_mesh(&mesh);
+  }
+  if (object) {
+    gfx_destroy_object(&object);
+  }
+  return false;
+}
+
+/// Create an environment light node.
+static SceneNode* make_environment_light(
+    SceneNode* root, const Texture* environment_map) {
+  assert(root);
+  assert(environment_map);
+
+  Light*     light      = 0;
+  SceneNode* light_node = 0;
+
+  light = gfx_make_light(&(LightDesc){
+      .type  = EnvironmentLightType,
+      .light = {(EnvironmentLightDesc){.environment_map = environment_map}}});
+  if (!light) {
+    goto cleanup;
+  }
+
+  light_node = gfx_make_light_node(light);
+  if (!light_node) {
+    goto cleanup;
+  }
+  gfx_set_node_parent(light_node, root);
+
+  return light_node;
+
+cleanup:
+  if (light) {
+    gfx_destroy_light(&light);
+  }
+  if (light_node) {
+    gfx_destroy_node(&light_node);
+  }
+  return 0;
+}
+
+SceneNode* gfx_setup_skyquad(
+    GfxCore* gfxcore, SceneNode* root, const Texture* environment_map) {
+  assert(gfxcore);
+  assert(root);
+  assert(environment_map);
+
+  SceneObject* skyquad_object = 0;
+  SceneNode*   object_node    = 0;
+  SceneNode*   light_node     = 0;
+
+  // Create the skyquad object.
+  skyquad_object = gfx_make_skyquad(gfxcore, environment_map);
+  if (!skyquad_object) {
+    goto cleanup;
+  }
+
+  // Create an object node to render the skyquad in the background.
+  object_node = gfx_make_object_node(skyquad_object);
+  if (!object_node) {
+    goto cleanup;
+  }
+  gfx_set_node_parent(object_node, root);
+
+  // Create an environment light node under which to root objects affected by
+  // the skyquad.
+  light_node = make_environment_light(root, environment_map);
+  if (!light_node) {
+    goto cleanup;
+  }
+
+  return light_node;
+
+cleanup:
+  if (skyquad_object) {
+    gfx_destroy_object(&skyquad_object);
+  }
+  if (object_node) {
+    gfx_destroy_node(&object_node);
+  }
+  if (light_node) {
+    gfx_destroy_node(&light_node);
+  }
+  return 0;
+}