1 files changed, 35 insertions, 0 deletions
diff --git a/shaders/vfog.cc b/shaders/vfog.cc
new file mode 100644
index 0000000..116d433
--- /dev/null
+++ b/shaders/vfog.cc
@@ -0,0 +1,35 @@
+#include "shaders.hh"
+
+static int u_mode = 0;
+static int u_steps = 8;
+static float u_sigma = 4.0f;
+
+static void ui()
+{
+  const char* modes[] = { "basic", "vfade", "waves" };
+  if (ImGui::BeginCombo("mode", modes[u_mode])) {
+    for (int i = 0; i < (int)COUNTOF(modes); ++i) {
+      if (ImGui::Selectable(modes[i], i == u_mode)) {
+        u_mode = i;
+      }
+    }
+    ImGui::EndCombo();
+  }
+  ImGui::SliderInt("steps", &u_steps, 1, 8);
+  ImGui::InputFloat("sigma", &u_sigma);
+}
+
+static void uniforms(Shader* shader)
+{
+  GL(glUniform1i(shader->get_required_uniform("u_mode"), u_mode));
+  GL(glUniform1i(shader->get_required_uniform("u_steps"), u_steps));
+  GL(glUniform1f(shader->get_required_uniform("u_sigma"), u_sigma));
+}
+
+static Shader vfog = {
+  .path   = "vfog.glsl",
+  .model  = MODEL_CUBE,
+  .ui_fn  = ui,
+  .uf_fn  = uniforms,
+};
+ENABLE_SHADER(vfog);