From 25a0f13ba221a3e97d50487a54ebcef9f4b540a5 Mon Sep 17 00:00:00 2001
From: "E. Almqvist" <elalmqvist@gmail.com>
Date: Tue, 11 Oct 2022 18:55:38 +0200
Subject: [PATCH] Shader IO

---
 shaders/fragment.glsl |  4 +++-
 shaders/vertex.glsl   | 10 ++++++----
 src/main.cpp          |  7 +++++++
 src/shaders.cpp       |  2 --
 4 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/shaders/fragment.glsl b/shaders/fragment.glsl
index 7376f07..e9478f5 100644
--- a/shaders/fragment.glsl
+++ b/shaders/fragment.glsl
@@ -1,6 +1,8 @@
 #version 330 core
 out vec4 FragColor;
 
+uniform vec4 inputColor;
+
 void main() {
-	FragColor = vec4(1.0f, 1.0f, 1.0f, 0.0f);
+	FragColor = inputColor;
 } 
diff --git a/shaders/vertex.glsl b/shaders/vertex.glsl
index 2969ee2..27a18e0 100644
--- a/shaders/vertex.glsl
+++ b/shaders/vertex.glsl
@@ -1,7 +1,9 @@
 #version 330 core
 layout (location = 0) in vec3 aPos;
 
-void main() 
-{
-	gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
-}
+out vec4 vertexColor;
+
+void main() {
+	gl_Position = vec4(aPos, 1.0);
+	vertexColor = vec4(1.0f, 1.0f, 1.0f, 0.0f);
+} 
diff --git a/src/main.cpp b/src/main.cpp
index ef76cb1..ec09097 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2,6 +2,7 @@
 #include <GLFW/glfw3.h>
 #include <stdio.h>
 #include <vector>
+#include <math.h>
 
 #include "shaders.cpp"
 
@@ -81,7 +82,13 @@ void renderCallback(RenderObj ro) {
 	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 	glClear(GL_COLOR_BUFFER_BIT);
 
+	float time = glfwGetTime();
+	float gVal = (sin(time) / 1.5f) + 0.5f;
+	int vertColLocation = glGetUniformLocation(ro.shaderProg, "inputColor");
+
 	glUseProgram(ro.shaderProg);
+	glUniform4f(vertColLocation, gVal, gVal, gVal, 1.0f);
+
 	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ro.EBO);
 	glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
 }
diff --git a/src/shaders.cpp b/src/shaders.cpp
index 3880d69..7be0e55 100644
--- a/src/shaders.cpp
+++ b/src/shaders.cpp
@@ -25,8 +25,6 @@ namespace Shader {
 	}
 
 	unsigned int compile(GLenum shadertype, const char* shaderSource) {
-		printf("--------------SRC-PREVIEW--------------\n%s\n---------------------------------------\n", shaderSource);
-
 		unsigned int shader;
 		shader = glCreateShader(shadertype);
 		glShaderSource(shader, 1, &shaderSource, NULL);