From 1c3e7e81049efefe8b54e4d4a719feeda995b474 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 24 Jan 2021 16:36:02 +0000
Subject: Remove the weird view/model/camera connectedness

---
 gfx/gl/shader.cpp             | 21 +++++++++++----------
 gfx/gl/shader.h               |  9 ++++-----
 gfx/gl/shaders/basicShader.vs |  8 ++++----
 gfx/gl/transform.cpp          | 10 ----------
 gfx/gl/transform.h            | 10 ++++++----
 5 files changed, 25 insertions(+), 33 deletions(-)

(limited to 'gfx/gl')

diff --git a/gfx/gl/shader.cpp b/gfx/gl/shader.cpp
index e59d431..31feb80 100644
--- a/gfx/gl/shader.cpp
+++ b/gfx/gl/shader.cpp
@@ -1,5 +1,4 @@
 #include "shader.h"
-#include "transform.h"
 #include <array>
 #include <gfx/gl/shaders/fs-basicShader.h>
 #include <gfx/gl/shaders/vs-basicShader.h>
@@ -7,7 +6,7 @@
 #include <stdexcept>
 #include <string>
 
-Shader::Shader() : mvp_uniform {}, normal_uniform {}, lightDir_uniform {}
+Shader::Shader() : viewProjection_uniform {}, model_uniform {}, lightDir_uniform {}
 {
 	glAttachShader(m_program, Source {{basicShader_vs, basicShader_vs_len}, GL_VERTEX_SHADER}.id);
 	glAttachShader(m_program, Source {{basicShader_fs, basicShader_fs_len}, GL_FRAGMENT_SHADER}.id);
@@ -22,8 +21,8 @@ Shader::Shader() : mvp_uniform {}, normal_uniform {}, lightDir_uniform {}
 	glValidateProgram(m_program);
 	CheckShaderError(m_program, GL_VALIDATE_STATUS, true, "Invalid shader program");
 
-	mvp_uniform = glGetUniformLocation(m_program, "MVP");
-	normal_uniform = glGetUniformLocation(m_program, "Normal");
+	viewProjection_uniform = glGetUniformLocation(m_program, "viewProjection");
+	model_uniform = glGetUniformLocation(m_program, "model");
 	lightDir_uniform = glGetUniformLocation(m_program, "lightDirection");
 }
 
@@ -34,14 +33,16 @@ Shader::Bind() const
 }
 
 void
-Shader::Update(const Transform & transform, const Camera & camera) const
+Shader::setView(glm::mat4 proj) const
 {
-	glm::mat4 MVP = transform.GetMVP(camera);
-	glm::mat4 Normal = transform.GetModel();
+	glUniformMatrix4fv(viewProjection_uniform, 1, GL_FALSE, &proj[0][0]);
+	glUniform3f(lightDir_uniform, 0.0F, -1.0F, 0.0F);
+}
 
-	glUniformMatrix4fv(mvp_uniform, 1, GL_FALSE, &MVP[0][0]);
-	glUniformMatrix4fv(normal_uniform, 1, GL_FALSE, &Normal[0][0]);
-	glUniform3f(lightDir_uniform, 0.0F, 0.0F, 1.0F);
+void
+Shader::setModel(glm::mat4 model) const
+{
+	glUniformMatrix4fv(model_uniform, 1, GL_FALSE, &model[0][0]);
 }
 
 void
diff --git a/gfx/gl/shader.h b/gfx/gl/shader.h
index e253f50..a839b9b 100644
--- a/gfx/gl/shader.h
+++ b/gfx/gl/shader.h
@@ -3,17 +3,16 @@
 
 #include <GL/glew.h>
 #include <glRef.hpp>
+#include <glm/glm.hpp>
 #include <string_view>
 
-class Camera;
-class Transform;
-
 class Shader {
 public:
 	Shader();
 
 	void Bind() const;
-	void Update(const Transform & transform, const Camera & camera) const;
+	void setView(glm::mat4 view) const;
+	void setModel(glm::mat4 model) const;
 
 private:
 	class Source {
@@ -31,7 +30,7 @@ private:
 	using ProgramRef = glRef<GLuint, __glewCreateProgram, __glewDeleteProgram>;
 
 	ProgramRef m_program;
-	GLint mvp_uniform, normal_uniform, lightDir_uniform;
+	GLint viewProjection_uniform, model_uniform, lightDir_uniform;
 };
 
 #endif
diff --git a/gfx/gl/shaders/basicShader.vs b/gfx/gl/shaders/basicShader.vs
index e673548..e697315 100644
--- a/gfx/gl/shaders/basicShader.vs
+++ b/gfx/gl/shaders/basicShader.vs
@@ -7,12 +7,12 @@ attribute vec3 normal;
 varying vec2 texCoord0;
 varying vec3 normal0;
 
-uniform mat4 MVP;
-uniform mat4 Normal;
+uniform mat4 viewProjection;
+uniform mat4 model;
 
 void main()
 {
-	gl_Position = MVP * vec4(position, 1.0);
+	gl_Position = viewProjection * model * vec4(position, 1.0);
 	texCoord0 = texCoord;
-	normal0 = (Normal * vec4(normal, 0.0)).xyz;
+	normal0 = (model * vec4(normal, 0.0)).xyz;
 }
diff --git a/gfx/gl/transform.cpp b/gfx/gl/transform.cpp
index 7b256af..b67bfaf 100644
--- a/gfx/gl/transform.cpp
+++ b/gfx/gl/transform.cpp
@@ -1,5 +1,4 @@
 #include "transform.h"
-#include "camera.h"
 #include <glm/gtx/transform.hpp>
 
 Transform::Transform(glm::vec3 pos, glm::vec3 rot, glm::vec3 scale) : pos {pos}, rot {rot}, scale {scale} { }
@@ -16,12 +15,3 @@ Transform::GetModel() const
 
 	return posMat * rotMat * scaleMat;
 }
-
-glm::mat4
-Transform::GetMVP(const Camera & camera) const
-{
-	const auto VP = camera.GetViewProjection();
-	const auto M = GetModel();
-
-	return VP * M;
-}
diff --git a/gfx/gl/transform.h b/gfx/gl/transform.h
index 70fe38f..f8d8d0d 100644
--- a/gfx/gl/transform.h
+++ b/gfx/gl/transform.h
@@ -3,16 +3,12 @@
 
 #include <glm/glm.hpp>
 
-class Camera;
-
 class Transform {
 public:
 	explicit Transform(glm::vec3 pos = {}, glm::vec3 rot = {}, glm::vec3 scale = {1.0F, 1.0F, 1.0F});
 
 	[[nodiscard]] glm::mat4 GetModel() const;
 
-	[[nodiscard]] glm::mat4 GetMVP(const Camera & camera) const;
-
 	[[nodiscard]] inline glm::vec3 &
 	GetPos()
 	{
@@ -31,6 +27,12 @@ public:
 		return rot;
 	}
 
+	[[nodiscard]] inline const glm::vec3 &
+	GetRot() const
+	{
+		return rot;
+	}
+
 	[[nodiscard]] inline glm::vec3 &
 	GetScale()
 	{
-- 
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