From dc73f3b5f1b92ab0dcbb6fb7b6ec79e7cd1a8b5f Mon Sep 17 00:00:00 2001
From: s473577 <matkan1@st.amu.edu.pl>
Date: Wed, 7 Feb 2024 15:09:10 +0100
Subject: [PATCH] Fix hud bars are no longer moving and rotating with spaceship
 movement

---
 grk/project/Spaceship.h        | 31 +++++++++++++++++++++++++++++++
 grk/project/SpriteRenderer.cpp |  2 +-
 grk/project/src/ex_9_1.hpp     |  7 ++++---
 3 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/grk/project/Spaceship.h b/grk/project/Spaceship.h
index 186231b..8876620 100644
--- a/grk/project/Spaceship.h
+++ b/grk/project/Spaceship.h
@@ -49,6 +49,7 @@ public:
 
 	glm::vec3 cameraPos = glm::vec3(0.479490f, 1.250000f, -2.124680f);
 	glm::vec3 cameraDir = glm::vec3(-0.354510f, 0.000000f, 0.935054f);
+	glm::vec3 cameraPosHUDBar = glm::vec3(0.479490f, 1.250000f, -2.124680f);
 	glm::mat4 additionalHorRotationMatrix;
 	glm::mat4 additionalVerRotationMatrix;
 
@@ -255,6 +256,8 @@ public:
 			requestShoot(time);
 
 		cameraPos = spaceshipPos - calculateCameraDistanceHor(w, shiftState, deltaTime) * spaceshipDir + glm::vec3(0, calculateCameraDistanceVer(deltaTime), 0);
+		cameraPosHUDBar = spaceshipPos - 1.f * spaceshipDir + glm::vec3(0, 1, 0) * 0.2f;
+
 		cameraDir = spaceshipDir;
 		glm::vec3 perpendicularVector = 0.04f * glm::normalize(glm::cross(spaceshipDir, glm::vec3(0.0f, 1.0f, 0.0f)));
 		if (leftParticle != nullptr && rightParticle != nullptr) {
@@ -340,4 +343,32 @@ public:
 	glm::mat4 getModelMatrix() override {
 		return calculateModelMatrix();
 	}
+
+	glm::mat4 calculateModelMatrixForHUDBar() {
+		glm::vec3 spaceshipSide = glm::normalize(glm::cross(spaceshipDir, glm::vec3(0.f, 1.f, 0.f)));
+		glm::vec3 spaceshipUp = glm::normalize(glm::cross(spaceshipSide, spaceshipDir));
+
+		glm::mat4 spaceshipCameraRotationMatrix = glm::mat4({
+			spaceshipSide.x, spaceshipSide.y, spaceshipSide.z, 0,
+			spaceshipUp.x, spaceshipUp.y, spaceshipUp.z, 0,
+			-spaceshipDir.x, -spaceshipDir.y, -spaceshipDir.z, 0,
+			0., 0., 0., 1.
+			});
+		return glm::translate(spaceshipPos) * spaceshipCameraRotationMatrix * glm::eulerAngleY(glm::pi<float>()) * glm::scale(glm::vec3(0.02f));
+	}
+	glm::mat4 createCameraMatrixForHUDBar()
+	{
+		glm::vec3 cameraSide = glm::normalize(glm::cross(cameraDir, glm::vec3(0.f, 1.f, 0.f)));
+		glm::vec3 cameraUp = glm::normalize(glm::cross(cameraSide, cameraDir));
+		glm::mat4 cameraRotrationMatrix = glm::mat4({
+			cameraSide.x,cameraSide.y,cameraSide.z,0,
+			cameraUp.x,cameraUp.y,cameraUp.z ,0,
+			-cameraDir.x,-cameraDir.y,-cameraDir.z,0,
+			0.,0.,0.,1.,
+			});
+		cameraRotrationMatrix = glm::transpose(cameraRotrationMatrix);
+		glm::mat4 cameraMatrix = cameraRotrationMatrix * glm::translate(-cameraPosHUDBar);
+
+		return cameraMatrix;
+	}
 };
\ No newline at end of file
diff --git a/grk/project/SpriteRenderer.cpp b/grk/project/SpriteRenderer.cpp
index c507f1c..7a375f1 100644
--- a/grk/project/SpriteRenderer.cpp
+++ b/grk/project/SpriteRenderer.cpp
@@ -16,7 +16,7 @@ void Core::SpriteRenderer::DrawHUDBar(const glm::vec3 color, const glm::mat4 mod
 	
 	Spaceship* spaceship = Spaceship::getInstance();
 
-	glm::mat4 viewProjectionMatrix = Core::createPerspectiveMatrix() * spaceship->createCameraMatrix();
+	glm::mat4 viewProjectionMatrix = Core::createPerspectiveMatrix() * spaceship->createCameraMatrixForHUDBar();
 
 	// Kombinuj macierze transformacji
 	glm::mat4 transformation = viewProjectionMatrix * modelMatrix;
diff --git a/grk/project/src/ex_9_1.hpp b/grk/project/src/ex_9_1.hpp
index cf1f207..f7ad488 100644
--- a/grk/project/src/ex_9_1.hpp
+++ b/grk/project/src/ex_9_1.hpp
@@ -104,13 +104,14 @@ void updateDeltaTime(float time) {
 	lastTime = time;
 }
 void renderHUD() {
+
 	glUseProgram(programSpriteBar);
 	glDisable(GL_DEPTH_TEST);
-	glm::mat4 spaceshipModelMatrix = spaceship->calculateModelMatrix();
-	glm::mat4 healthBarPosition = glm::translate(spaceshipModelMatrix, glm::vec3(36.0f, -34.0f, 0.0f));
+	glm::mat4 modelMatrixHUD = spaceship->calculateModelMatrixForHUDBar();
+	glm::mat4 healthBarPosition = glm::translate(modelMatrixHUD, glm::vec3(38.0f, -35.0f, 0.0f));
 	spriteRenderer->DrawHUDBar(
 		glm::vec3(0.0f, 1.0f, 0.0f),
-		glm::scale(healthBarPosition, glm::vec3(26.0f, 4.f, 1.0f)),
+		glm::scale(healthBarPosition, glm::vec3(22.0f, 4.f, 1.0f)),
 		spaceship->currentHP / spaceship->maxHP,
 		programSpriteBar);
 	glEnable(GL_DEPTH_TEST);