Bind the network profile in as uniforms

Makes the network shaders generic to network type

5 files changed, 50 insertions, 24 deletions

diff --git a/game/network/rail.cpp b/game/network/rail.cpp
index 216ec1c..176a704 100644
--- a/game/network/rail.cpp
+++ b/game/network/rail.cpp
@@ -73,16 +73,20 @@ RailLinks::addLinksBetween(GlobalPosition3D start, GlobalPosition3D end)
 	return addLink<RailLinkCurve>(start, end, centre.first);
 }
 
-constexpr const std::array<std::pair<RelativePosition3D, float>, RAIL_CROSSSECTION_VERTICES> railCrossSection {{
-		//   ___________
-		// _/           \_
-		//  left to right
-		{{-1900.F, 0.F, 0.F}, 0.F},
-		{{-608.F, 0.F, RAIL_HEIGHT.z}, .34F},
-		{{0, 0.F, RAIL_HEIGHT.z * .7F}, .5F},
-		{{608.F, 0.F, RAIL_HEIGHT.z}, .66F},
-		{{1900.F, 0.F, 0.F}, 1.F},
+constexpr const std::array<RelativePosition3D, RAIL_CROSSSECTION_VERTICES> railCrossSection {{
+		{-1900.F, 0.F, 0.F},
+		{-608.F, 0.F, RAIL_HEIGHT.z},
+		{0, 0.F, RAIL_HEIGHT.z * .7F},
+		{608.F, 0.F, RAIL_HEIGHT.z},
+		{1900.F, 0.F, 0.F},
 }};
+constexpr const std::array<float, RAIL_CROSSSECTION_VERTICES> railTexturePos {
+		0.F,
+		.34F,
+		.5F,
+		.66F,
+		1.F,
+};
 constexpr auto sleepers {5.F}; // There are 5 repetitions of sleepers in the texture
 
 inline auto
@@ -149,7 +153,7 @@ namespace {
 	renderType(const NetworkLinkHolder<LinkType> & n, auto & s)
 	{
 		if (auto count = n.vertices.size()) {
-			s.use();
+			s.use(railCrossSection, railTexturePos);
 			glBindVertexArray(n.vao);
 			glDrawArrays(GL_POINTS, 0, static_cast<GLsizei>(count));
 		}
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