From 7ec93debf10cca759067a6a137f9730f0ca5adad Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Fri, 25 May 2018 17:44:34 +0200
Subject: [PATCH] [dxvk] Add shaders for mip map generation

---
 src/dxvk/shaders/dxvk_mipgen_frag_1d.frag | 11 ++++++++++
 src/dxvk/shaders/dxvk_mipgen_frag_2d.frag | 11 ++++++++++
 src/dxvk/shaders/dxvk_mipgen_frag_3d.frag | 17 +++++++++++++++
 src/dxvk/shaders/dxvk_mipgen_geom.geom    | 25 +++++++++++++++++++++++
 src/dxvk/shaders/dxvk_mipgen_vert.vert    |  8 ++++++++
 5 files changed, 72 insertions(+)
 create mode 100644 src/dxvk/shaders/dxvk_mipgen_frag_1d.frag
 create mode 100644 src/dxvk/shaders/dxvk_mipgen_frag_2d.frag
 create mode 100644 src/dxvk/shaders/dxvk_mipgen_frag_3d.frag
 create mode 100644 src/dxvk/shaders/dxvk_mipgen_geom.geom
 create mode 100644 src/dxvk/shaders/dxvk_mipgen_vert.vert

diff --git a/src/dxvk/shaders/dxvk_mipgen_frag_1d.frag b/src/dxvk/shaders/dxvk_mipgen_frag_1d.frag
new file mode 100644
index 000000000..0e1819510
--- /dev/null
+++ b/src/dxvk/shaders/dxvk_mipgen_frag_1d.frag
@@ -0,0 +1,11 @@
+#version 450
+
+layout(set = 0, binding = 0)
+uniform sampler1DArray s_texture;
+
+layout(location = 0) in  vec3 i_pos;
+layout(location = 0) out vec4 o_color;
+
+void main() {
+  o_color = texture(s_texture, i_pos.xz);
+}
\ No newline at end of file
diff --git a/src/dxvk/shaders/dxvk_mipgen_frag_2d.frag b/src/dxvk/shaders/dxvk_mipgen_frag_2d.frag
new file mode 100644
index 000000000..e7a0b0820
--- /dev/null
+++ b/src/dxvk/shaders/dxvk_mipgen_frag_2d.frag
@@ -0,0 +1,11 @@
+#version 450
+
+layout(set = 0, binding = 0)
+uniform sampler2DArray s_texture;
+
+layout(location = 0) in  vec3 i_pos;
+layout(location = 0) out vec4 o_color;
+
+void main() {
+  o_color = texture(s_texture, i_pos);
+}
\ No newline at end of file
diff --git a/src/dxvk/shaders/dxvk_mipgen_frag_3d.frag b/src/dxvk/shaders/dxvk_mipgen_frag_3d.frag
new file mode 100644
index 000000000..42429cd91
--- /dev/null
+++ b/src/dxvk/shaders/dxvk_mipgen_frag_3d.frag
@@ -0,0 +1,17 @@
+#version 450
+
+layout(set = 0, binding = 0)
+uniform sampler3D s_texture;
+
+layout(location = 0) in  vec3 i_pos;
+layout(location = 0) out vec4 o_color;
+
+layout(push_constant)
+uniform push_block {
+  uint p_layer_count;
+};
+
+void main() {
+  o_color = texture(s_texture, vec3(i_pos.xy,
+    (i_pos.z + 0.5f) / float(p_layer_count)));
+}
\ No newline at end of file
diff --git a/src/dxvk/shaders/dxvk_mipgen_geom.geom b/src/dxvk/shaders/dxvk_mipgen_geom.geom
new file mode 100644
index 000000000..c7413a434
--- /dev/null
+++ b/src/dxvk/shaders/dxvk_mipgen_geom.geom
@@ -0,0 +1,25 @@
+#version 450
+
+layout(points) in;
+layout(triangle_strip, max_vertices = 4) out;
+
+layout(location = 0) in  int  i_instance[1];
+layout(location = 0) out vec3 o_pos;
+
+const vec4 g_vpos[4] = {
+  vec4(-1.0f, -1.0f, 0.0f, 1.0f),
+  vec4(-1.0f,  1.0f, 0.0f, 1.0f),
+  vec4( 1.0f, -1.0f, 0.0f, 1.0f),
+  vec4( 1.0f,  1.0f, 0.0f, 1.0f),
+};
+
+void main() {
+  for (int i = 0; i < 4; i++) {
+    o_pos       = vec3(0.5f + 0.5f * g_vpos[i].xy, float(i_instance[0]));
+    gl_Position = g_vpos[i];
+    gl_Layer    = i_instance[0];
+    EmitVertex();
+  }
+  
+  EndPrimitive();
+}
\ No newline at end of file
diff --git a/src/dxvk/shaders/dxvk_mipgen_vert.vert b/src/dxvk/shaders/dxvk_mipgen_vert.vert
new file mode 100644
index 000000000..3009b809b
--- /dev/null
+++ b/src/dxvk/shaders/dxvk_mipgen_vert.vert
@@ -0,0 +1,8 @@
+#version 450
+
+layout(location = 0) out int o_instance;
+
+void main() {
+  o_instance = gl_InstanceIndex;
+  gl_Position = vec4(0.0f, 0.0f, 0.0f, 1.0f);
+}
\ No newline at end of file