From ba452b41c9e3cb0a039ddf0a9e3ba30808c29fc5 Mon Sep 17 00:00:00 2001
From: Jeremy HU <huxingyi@msn.com>
Date: Wed, 21 Sep 2022 22:14:02 +1000
Subject: [PATCH] Show plain color without any light

---
 application/shaders/model_core.frag |  9 +++++++--
 application/shaders/model_core.vert | 18 +++++++++++++++++-
 application/sources/model_widget.cc |  5 +++--
 3 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/application/shaders/model_core.frag b/application/shaders/model_core.frag
index f50d46e2..c2970b21 100644
--- a/application/shaders/model_core.frag
+++ b/application/shaders/model_core.frag
@@ -1,7 +1,12 @@
 #version 330
-uniform vec4 defaultColor;
+in vec3 pointPosition;
+in vec3 pointNormal;
+in vec3 pointColor;
+in float pointAlpha;
+in float pointMetalness;
+in float pointRoughness;
 out vec4 fragColor;
 void main()
 {
-    fragColor = defaultColor;
+    fragColor = vec4(pointColor, pointAlpha);
 }
\ No newline at end of file
diff --git a/application/shaders/model_core.vert b/application/shaders/model_core.vert
index 13829aeb..9a70ba6e 100644
--- a/application/shaders/model_core.vert
+++ b/application/shaders/model_core.vert
@@ -10,7 +10,23 @@ layout(location = 7) in float alpha;
 uniform mat4 modelMatrix;
 uniform mat4 viewMatrix;
 uniform mat4 projectionMatrix;
+uniform vec3 lightDirection;
+uniform vec3 eyePosition;
+out vec3 pointPosition;
+out vec3 pointNormal;
+out vec3 pointColor;
+out float pointAlpha;
+out float pointMetalness;
+out float pointRoughness;
+
 void main()
 {
-    gl_Position = projectionMatrix * viewMatrix * modelMatrix * vertex;
+    pointPosition = (modelMatrix * vertex).xyz;
+    pointNormal = normalize((modelMatrix * vec4(normal, 1.0)).xyz);
+    pointColor = color;
+    pointAlpha = alpha;
+    pointMetalness = metalness;
+    pointRoughness = roughness;
+
+    gl_Position = projectionMatrix * viewMatrix * vec4(pointPosition, 1.0);
 }
\ No newline at end of file
diff --git a/application/sources/model_widget.cc b/application/sources/model_widget.cc
index 2f96026f..1ab0f021 100644
--- a/application/sources/model_widget.cc
+++ b/application/sources/model_widget.cc
@@ -176,14 +176,15 @@ void ModelWidget::paintGL()
 
     m_openGLProgram->bind();
 
+    m_openGLProgram->setUniformValue(m_openGLProgram->getUniformLocationByName("eyePosition"), m_eyePosition);
+    m_openGLProgram->setUniformValue(m_openGLProgram->getUniformLocationByName("lightDirection"), QVector3D(-1.0, -1.0, -1.0).normalized());
     m_openGLProgram->setUniformValue(m_openGLProgram->getUniformLocationByName("projectionMatrix"), m_projection);
     m_openGLProgram->setUniformValue(m_openGLProgram->getUniformLocationByName("modelMatrix"), m_world);
     m_openGLProgram->setUniformValue(m_openGLProgram->getUniformLocationByName("viewMatrix"), m_camera);
-    m_openGLProgram->setUniformValue(m_openGLProgram->getUniformLocationByName("defaultColor"), QVector4D(1.0, 1.0, 1.0, 1.0));
 
     if (m_openGLObject)
         m_openGLObject->draw();
-        
+
     m_openGLProgram->release();
 }