From 961f69d8cda0364c04ec98efc70a6f21e0a091e6 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Mon, 22 Jan 2024 02:25:47 +0000
Subject: Bind the network profile in as uniforms

Makes the network shaders generic to network type
---
 gfx/gl/sceneShader.cpp            | 17 +++++++++++++++++
 gfx/gl/sceneShader.h              | 14 ++++++++++++--
 gfx/gl/shaders/networkCommon.glsl | 17 ++++++-----------
 gfx/gl/shaders/networkCurve.gs    |  2 +-
 4 files changed, 36 insertions(+), 14 deletions(-)

(limited to 'gfx/gl')

diff --git a/gfx/gl/sceneShader.cpp b/gfx/gl/sceneShader.cpp
index 146e642..bc64a88 100644
--- a/gfx/gl/sceneShader.cpp
+++ b/gfx/gl/sceneShader.cpp
@@ -86,6 +86,23 @@ SceneShader::BasicProgram::use(Location const & location) const
 	setModel(location);
 }
 
+template<typename... S>
+SceneShader::NetworkProgram::NetworkProgram(S &&... s) :
+	AbsolutePosProgram {std::forward<S>(s)...}, profileLoc {*this, "profile"}, texturePosLoc {*this, "texturePos"},
+	profileLengthLoc {*this, "profileLength"}
+{
+}
+
+void
+SceneShader::NetworkProgram::use(
+		const std::span<const glm::vec3> profile, const std::span<const float> texturePos) const
+{
+	Program::use();
+	glUniform(profileLoc, profile);
+	glUniform(texturePosLoc, texturePos);
+	glUniform(profileLengthLoc, static_cast<GLuint>(profile.size()));
+}
+
 SceneShader::WaterProgram::WaterProgram() : SceneProgram {water_vs, water_fs}, waveLoc {*this, "waves"} { }
 
 void
diff --git a/gfx/gl/sceneShader.h b/gfx/gl/sceneShader.h
index c86d157..8621442 100644
--- a/gfx/gl/sceneShader.h
+++ b/gfx/gl/sceneShader.h
@@ -3,6 +3,7 @@
 #include "config/types.h"
 #include "program.h"
 #include <glArrays.h>
+#include <span>
 
 class Location;
 
@@ -41,8 +42,17 @@ class SceneShader {
 		using SceneProgram::SceneProgram;
 	};
 
-	class WaterProgram : public SceneProgram {
+	class NetworkProgram : public AbsolutePosProgram {
 	public:
+		template<typename... S> explicit NetworkProgram(S &&...);
+
+		void use(const std::span<const glm::vec3>, const std::span<const float>) const;
+
+	private:
+		RequiredUniformLocation profileLoc, texturePosLoc, profileLengthLoc;
+	};
+
+	class WaterProgram : public SceneProgram {
 	public:
 		WaterProgram();
 		void use(float waveCycle) const;
@@ -57,7 +67,7 @@ public:
 	BasicProgram basic;
 	WaterProgram water;
 	AbsolutePosProgram basicInst, landmass, absolute, spotLightInst, pointLightInst;
-	AbsolutePosProgram networkStraight, networkCurve;
+	NetworkProgram networkStraight, networkCurve;
 
 	void setViewProjection(const GlobalPosition3D & viewPoint, const glm::mat4 & viewProjection) const;
 	void setViewPort(const ViewPort & viewPort) const;
diff --git a/gfx/gl/shaders/networkCommon.glsl b/gfx/gl/shaders/networkCommon.glsl
index e1811bc..7b55cad 100644
--- a/gfx/gl/shaders/networkCommon.glsl
+++ b/gfx/gl/shaders/networkCommon.glsl
@@ -1,11 +1,6 @@
-const float RAIL_HEIGHT = 250;
-const vec3[] profile = vec3[]( //
-		vec3(-1900.F, 0.F, 0.F), //
-		vec3(-608.F, 0.F, RAIL_HEIGHT), //
-		vec3(0, 0.F, RAIL_HEIGHT * .7F), //
-		vec3(608.F, 0.F, RAIL_HEIGHT), //
-		vec3(1900.F, 0.F, 0.F));
-const float[profile.length()] texturePos = float[](0, 0.34, 0.5, 0.65, 1);
+uniform vec3[10] profile;
+uniform float[10] texturePos;
+uniform uint profileLength;
 
 uniform mat4 viewProjection;
 uniform ivec3 viewPoint;
@@ -25,7 +20,7 @@ segDist(const ivec3 a, const ivec3 b)
 ifelse(
 		TYPE, .gs,
 		// Begin: Geometry shader only function
-		void doVertex(const ivec3 end, const int v, const float texY, const mat2 rot) {
+		void doVertex(const ivec3 end, const uint v, const float texY, const mat2 rot) {
 			rposition = vec3(rot * profile[v].xy, profile[v].z);
 			ivec3 vpos = end + ivec3(rposition);
 			gl_Position = viewProjection * vec4(vpos - viewPoint, 1);
@@ -36,8 +31,8 @@ ifelse(
 		void doSeg(const float dist, const ivec3 apos, const ivec3 bpos, const float atexY, const float btexY,
 				const mat2 arot, const mat2 brot) {
 			if (dist < clipDistance) {
-				int vstep = (dist < flatDistance) ? 1 : profile.length() - 1;
-				for (int v = 0; v < profile.length(); v += vstep) {
+				uint vstep = (dist < flatDistance) ? 1u : profileLength - 1u;
+				for (uint v = 0u; v < profileLength; v += vstep) {
 					doVertex(bpos, v, btexY, brot);
 					doVertex(apos, v, atexY, arot);
 				}
diff --git a/gfx/gl/shaders/networkCurve.gs b/gfx/gl/shaders/networkCurve.gs
index 619625f..7cb6c42 100644
--- a/gfx/gl/shaders/networkCurve.gs
+++ b/gfx/gl/shaders/networkCurve.gs
@@ -25,7 +25,7 @@ void
 main()
 {
 	float segs = clamp(
-			round(reps[0] * radius[0] / 1000), 4, floor(GL_MAX_GEOMETRY_OUTPUT_VERTICES / (profile.length() * 2)));
+			round(reps[0] * radius[0] / 1000), 4, floor(uint(GL_MAX_GEOMETRY_OUTPUT_VERTICES) / (profileLength * 2u)));
 	vec3 arcstep = vec3((bangle[0] - aangle[0]), // angle
 						   reps[0], // texture
 						   (bpos[0].z - apos[0].z)) // height
-- 
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