From e751ab465bbbf1365ec6e108c64dafd03ce42f1d Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 23 Apr 2023 21:46:21 +0100
Subject: Pop and complete instanced shadow support

---
 gfx/gl/shaders/shadowDynamicPointInst.vs | 13 +++++++++++++
 gfx/gl/shadowMapper.cpp                  |  7 +++++--
 gfx/gl/shadowMapper.h                    |  4 ++--
 3 files changed, 20 insertions(+), 4 deletions(-)
 create mode 100644 gfx/gl/shaders/shadowDynamicPointInst.vs

(limited to 'gfx/gl')

diff --git a/gfx/gl/shaders/shadowDynamicPointInst.vs b/gfx/gl/shaders/shadowDynamicPointInst.vs
new file mode 100644
index 0000000..eb7313a
--- /dev/null
+++ b/gfx/gl/shaders/shadowDynamicPointInst.vs
@@ -0,0 +1,13 @@
+#version 330 core
+
+include(`meshIn.glsl')
+layout(location = 5) in mat4 model;
+
+uniform mat4 viewProjection;
+
+void
+main()
+{
+	gl_Position = viewProjection * model * vec4(position, 1.0);
+	gl_Position.z = max(gl_Position.z, -1);
+}
diff --git a/gfx/gl/shadowMapper.cpp b/gfx/gl/shadowMapper.cpp
index 7649a54..9f1e420 100644
--- a/gfx/gl/shadowMapper.cpp
+++ b/gfx/gl/shadowMapper.cpp
@@ -2,6 +2,7 @@
 #include "camera.h"
 #include "collections.hpp"
 #include "gfx/gl/shaders/vs-shadowDynamicPoint.h"
+#include "gfx/gl/shaders/vs-shadowDynamicPointInst.h"
 #include "gfx/gl/shaders/vs-shadowFixedPoint.h"
 #include "location.hpp"
 #include "maths.h"
@@ -14,7 +15,8 @@
 #include <tuple>
 #include <vector>
 
-ShadowMapper::ShadowMapper(const glm::ivec2 & s) : size {s}
+ShadowMapper::ShadowMapper(const glm::ivec2 & s) :
+	fixedPoint {shadowFixedPoint_vs}, dynamicPointInst {shadowDynamicPointInst_vs}, size {s}
 {
 	glBindTexture(GL_TEXTURE_2D, depthMap);
 	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, size.x, size.y, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr);
@@ -144,6 +146,7 @@ ShadowMapper::update(const SceneProvider & scene, const glm::vec3 & dir, const C
 				const auto lightViewProjection = lightProjection * lightView;
 				fixedPoint.setViewProjection(lightViewProjection);
 				dynamicPoint.setViewProjection(lightViewProjection);
+				dynamicPointInst.setViewProjection(lightViewProjection);
 
 				const auto & viewport = viewports[bands][out.maps];
 				glViewport(size.x >> viewport.x, size.y >> viewport.y, size.x >> viewport.z, size.y >> viewport.w);
@@ -157,7 +160,7 @@ ShadowMapper::update(const SceneProvider & scene, const glm::vec3 & dir, const C
 	return out;
 }
 
-ShadowMapper::FixedPoint::FixedPoint() : Program {shadowFixedPoint_vs}, viewProjectionLoc {*this, "viewProjection"} { }
+ShadowMapper::FixedPoint::FixedPoint(const Shader & vs) : Program {vs}, viewProjectionLoc {*this, "viewProjection"} { }
 void
 ShadowMapper::FixedPoint::setViewProjection(const glm::mat4 & viewProjection) const
 {
diff --git a/gfx/gl/shadowMapper.h b/gfx/gl/shadowMapper.h
index a5c2c7b..36371eb 100644
--- a/gfx/gl/shadowMapper.h
+++ b/gfx/gl/shadowMapper.h
@@ -22,7 +22,7 @@ public:
 
 	class FixedPoint : public Program {
 	public:
-		FixedPoint();
+		FixedPoint(const Shader & vs);
 		void setViewProjection(const glm::mat4 &) const;
 		void use() const;
 
@@ -40,7 +40,7 @@ public:
 		RequiredUniformLocation viewProjectionLoc;
 		RequiredUniformLocation modelLoc;
 	};
-	FixedPoint fixedPoint;
+	FixedPoint fixedPoint, dynamicPointInst;
 	DynamicPoint dynamicPoint;
 
 	// NOLINTNEXTLINE(hicpp-explicit-conversions)
-- 
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