From f737aada2b7164683303beb3bb490c30a4949fb0 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 21 Jul 2024 02:33:24 +0100
Subject: Use texture alpha in shadow stencil

---
 gfx/gl/shaders/shadowStencil.fs | 16 ++++++++++++++++
 gfx/gl/shaders/shadowStencil.vs |  7 +++++++
 gfx/gl/shadowStenciller.cpp     |  8 ++++++--
 gfx/gl/shadowStenciller.h       |  4 ++--
 4 files changed, 31 insertions(+), 4 deletions(-)

(limited to 'gfx/gl')

diff --git a/gfx/gl/shaders/shadowStencil.fs b/gfx/gl/shaders/shadowStencil.fs
index e69de29..f149c23 100644
--- a/gfx/gl/shaders/shadowStencil.fs
+++ b/gfx/gl/shaders/shadowStencil.fs
@@ -0,0 +1,16 @@
+#version 330 core
+#extension GL_ARB_shading_language_420pack : enable
+
+layout(binding = 0) uniform sampler2D textureAlbedo;
+
+include(`materialInterface.glsl')
+include(`materialCommon.glsl')
+
+void
+main()
+{
+	if (getTextureColour(Material, TexCoords).a < 0.5) {
+		discard;
+	}
+	gl_FragDepth = gl_FragCoord.z;
+}
diff --git a/gfx/gl/shaders/shadowStencil.vs b/gfx/gl/shaders/shadowStencil.vs
index 4f4c250..45a0867 100644
--- a/gfx/gl/shaders/shadowStencil.vs
+++ b/gfx/gl/shaders/shadowStencil.vs
@@ -1,11 +1,18 @@
 #version 330 core
 #extension GL_ARB_shading_language_420pack : enable
 
+layout(binding = 1) uniform usampler2DRect materialData;
+
 include(`meshIn.glsl')
+include(`materialInterface.glsl')
+include(`getMaterialDetail.glsl')
 uniform mat4 viewProjection;
 
 void
 main()
 {
+	TexCoords = texCoord;
+	Material = getMaterialDetail(material);
+
 	gl_Position = viewProjection * vec4(position, 1);
 }
diff --git a/gfx/gl/shadowStenciller.cpp b/gfx/gl/shadowStenciller.cpp
index e20eda1..2ba519f 100644
--- a/gfx/gl/shadowStenciller.cpp
+++ b/gfx/gl/shadowStenciller.cpp
@@ -1,6 +1,7 @@
 #include "shadowStenciller.h"
 #include "config/types.h"
 #include "gfx/gl/program.h"
+#include "gfx/gl/shaders/fs-shadowStencil.h"
 #include "gfx/gl/shaders/vs-shadowStencil.h"
 #include "gfx/models/mesh.h"
 #include "glArrays.h"
@@ -8,7 +9,7 @@
 #include "maths.h"
 #include <stdexcept>
 
-ShadowStenciller::ShadowStenciller() : shadowCaster {shadowStencil_vs}
+ShadowStenciller::ShadowStenciller() : shadowCaster {shadowStencil_vs, shadowStencil_fs}
 {
 	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 	glDrawBuffer(GL_NONE);
@@ -32,13 +33,16 @@ ShadowStenciller::createStencilTexture(GLsizei width, GLsizei height)
 }
 
 void
-ShadowStenciller::renderStencil(const glTexture & stencil, const MeshBase & mesh) const
+ShadowStenciller::renderStencil(const glTexture & stencil, const MeshBase & mesh, const Texture::AnyPtr texture) const
 {
 	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 	glFramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, stencil, 0);
 	if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
 		throw std::runtime_error("Stencil framebuffer not complete!");
 	}
+	if (texture) {
+		texture->bind();
+	}
 	glUseProgram(shadowCaster);
 	glClear(GL_DEPTH_BUFFER_BIT);
 	glViewport(0, 0, 256, 256);
diff --git a/gfx/gl/shadowStenciller.h b/gfx/gl/shadowStenciller.h
index 5a22a7e..bf6d204 100644
--- a/gfx/gl/shadowStenciller.h
+++ b/gfx/gl/shadowStenciller.h
@@ -1,8 +1,8 @@
 #pragma once
 
-#include "config/types.h"
 #include "gfx/gl/program.h"
 #include "gfx/models/mesh.h"
+#include "gfx/models/texture.h"
 #include "glArrays.h"
 
 class ShadowStenciller {
@@ -11,7 +11,7 @@ public:
 
 	[[nodiscard]]
 	static glTexture createStencilTexture(GLsizei width, GLsizei height);
-	void renderStencil(const glTexture &, const MeshBase &) const;
+	void renderStencil(const glTexture &, const MeshBase &, const Texture::AnyPtr texture) const;
 
 private:
 	glFrameBuffer fbo;
-- 
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