From f22f79330f9b8851cda76d1e11555877cbb72d80 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Tue, 3 Sep 2024 01:37:03 +0100
Subject: Populate all layers of the stencil texture

Albeit with the same projection
---
 gfx/gl/shaders/shadowStencil.fs |  6 ++++--
 gfx/gl/shaders/shadowStencil.gs | 28 ++++++++++++++++++++++++++++
 gfx/gl/shaders/shadowStencil.vs | 10 ++++++----
 gfx/gl/shadowStenciller.cpp     |  3 ++-
 4 files changed, 40 insertions(+), 7 deletions(-)
 create mode 100644 gfx/gl/shaders/shadowStencil.gs

diff --git a/gfx/gl/shaders/shadowStencil.fs b/gfx/gl/shaders/shadowStencil.fs
index f149c23..1164cc9 100644
--- a/gfx/gl/shaders/shadowStencil.fs
+++ b/gfx/gl/shaders/shadowStencil.fs
@@ -3,13 +3,15 @@
 
 layout(binding = 0) uniform sampler2D textureAlbedo;
 
-include(`materialInterface.glsl')
+include(`materialDetail.glsl')
 include(`materialCommon.glsl')
+in vec2 gTexCoords;
+flat in MaterialDetail gMaterial;
 
 void
 main()
 {
-	if (getTextureColour(Material, TexCoords).a < 0.5) {
+	if (getTextureColour(gMaterial, gTexCoords).a < 0.5) {
 		discard;
 	}
 	gl_FragDepth = gl_FragCoord.z;
diff --git a/gfx/gl/shaders/shadowStencil.gs b/gfx/gl/shaders/shadowStencil.gs
new file mode 100644
index 0000000..eea4643
--- /dev/null
+++ b/gfx/gl/shaders/shadowStencil.gs
@@ -0,0 +1,28 @@
+#version 330 core
+#extension GL_ARB_viewport_array : enable
+
+include(`materialDetail.glsl')
+
+layout(triangles) in;
+layout(triangle_strip, max_vertices = 24) out;
+
+uniform mat4 viewProjection;
+in vec3 FragPos[];
+in vec2 TexCoords[];
+flat in MaterialDetail Material[];
+out vec2 gTexCoords;
+flat out MaterialDetail gMaterial;
+
+void
+main()
+{
+	for (gl_Layer = 0; gl_Layer < 8; ++gl_Layer) {
+		for (int v = 0; v < FragPos.length(); ++v) {
+			gl_Position = viewProjection * vec4(FragPos[v], 1);
+			gTexCoords = TexCoords[v];
+			gMaterial = Material[v];
+			EmitVertex();
+		}
+		EndPrimitive();
+	}
+}
diff --git a/gfx/gl/shaders/shadowStencil.vs b/gfx/gl/shaders/shadowStencil.vs
index 45a0867..a15c4fb 100644
--- a/gfx/gl/shaders/shadowStencil.vs
+++ b/gfx/gl/shaders/shadowStencil.vs
@@ -4,15 +4,17 @@
 layout(binding = 1) uniform usampler2DRect materialData;
 
 include(`meshIn.glsl')
-include(`materialInterface.glsl')
+include(`materialDetail.glsl')
 include(`getMaterialDetail.glsl')
-uniform mat4 viewProjection;
+
+out vec3 FragPos;
+out vec2 TexCoords;
+flat out MaterialDetail Material;
 
 void
 main()
 {
 	TexCoords = texCoord;
 	Material = getMaterialDetail(material);
-
-	gl_Position = viewProjection * vec4(position, 1);
+	FragPos = position;
 }
diff --git a/gfx/gl/shadowStenciller.cpp b/gfx/gl/shadowStenciller.cpp
index 01248bd..1063b71 100644
--- a/gfx/gl/shadowStenciller.cpp
+++ b/gfx/gl/shadowStenciller.cpp
@@ -1,13 +1,14 @@
 #include "shadowStenciller.h"
 #include "gfx/gl/program.h"
 #include "gfx/gl/shaders/fs-shadowStencil.h"
+#include "gfx/gl/shaders/gs-shadowStencil.h"
 #include "gfx/gl/shaders/vs-shadowStencil.h"
 #include "gfx/models/mesh.h"
 #include "glArrays.h"
 #include "gl_traits.h"
 #include <stdexcept>
 
-ShadowStenciller::ShadowStenciller() : shadowCaster {shadowStencil_vs, shadowStencil_fs}
+ShadowStenciller::ShadowStenciller() : shadowCaster {shadowStencil_vs, shadowStencil_gs, shadowStencil_fs}
 {
 	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 	glDrawBuffer(GL_NONE);
-- 
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