From 15cc550bf9d952b2d45c90239508733152487cad Mon Sep 17 00:00:00 2001
From: k <markers711@gmail.com>
Date: Thu, 19 Dec 2024 18:10:33 -0500
Subject: [PATCH] RGB Pulse triangle

---
 headers/shapes.h | 9 +++++++++
 src/main.cpp     | 4 +++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/headers/shapes.h b/headers/shapes.h
index e97b32d..b1d414f 100644
--- a/headers/shapes.h
+++ b/headers/shapes.h
@@ -54,3 +54,12 @@ const char *rgbFragmentShaderSource = "#version 330 core\n"
                                       "{\n"
                                       "    FragColor = vec4(color, 1.0);\n"
                                       "}\0";
+
+const char *rgbPulseFragmentShaderSource = "#version 330 core\n"
+                                       "out vec4 FragColor;\n"
+                                       "in vec3 color;\n"
+                                       "uniform float u_time;"
+                                       "void main()\n"
+                                       "{\n"
+                                       "    FragColor = vec4(color,0.0)*(sin(u_time)/2.0+0.5);\n"
+                                       "}\0";
diff --git a/src/main.cpp b/src/main.cpp
index 38778df..48041cd 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -53,7 +53,7 @@ int main(void) {
   */
 
   unsigned int shaderProgram =
-      shaderProgramCMPL(rgbVertexShaderSource, rgbFragmentShaderSource);
+      shaderProgramCMPL(rgbVertexShaderSource, rgbPulseFragmentShaderSource);
   glUseProgram(shaderProgram);
 
   while (!glfwWindowShouldClose(window)) {
@@ -63,6 +63,8 @@ int main(void) {
     glClear(GL_COLOR_BUFFER_BIT);
 
     glUseProgram(shaderProgram);
+    GLint utime = glGetUniformLocation(shaderProgram, "u_time");
+    glUniform1f(utime, glfwGetTime());
     glBindVertexArray(VAO);
 
     //glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);