From 9922846acc033b597859d1aa615460aa1572fa44 Mon Sep 17 00:00:00 2001
From: monoid <qaswedfr55@gmail.com>
Date: Tue, 28 Sep 2021 15:27:00 +0900
Subject: [PATCH] shader uniform

---
 index.ts          | 14 +++++++++-----
 src/fragment.frag |  5 ++++-
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/index.ts b/index.ts
index 8793d81..0505bac 100644
--- a/index.ts
+++ b/index.ts
@@ -27,8 +27,12 @@ class Renderer{
     gl : WebGL2RenderingContextStrict;
     constructor(gl: WebGL2RenderingContextStrict){
         this.gl = gl;
+    }
+    init(){
+        const gl = this.gl;
+        let program: WebGLProgram;
         try{
-            const program = createProgramFromSource(gl,vert_src,frag_src);
+            program = createProgramFromSource(gl,vert_src,frag_src);
             gl.useProgram(program);
         }
         catch(e){
@@ -40,9 +44,6 @@ class Renderer{
             }
             else throw e;
         }
-    }
-    init(){
-        const gl = this.gl;
         const position = [
             -0.5,-0.5,
             0.5,-0.5,
@@ -60,7 +61,10 @@ class Renderer{
         const indexBuffer = gl.createBuffer();
         gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER,indexBuffer);
         gl.bufferData(gl.ELEMENT_ARRAY_BUFFER,new Uint16Array(index),gl.STATIC_DRAW);
-        
+
+        let location = gl.getUniformLocation(program, "u_color"); //u_color 변수 위치를 참조
+        gl.uniform4f(location, 0.8, 0.3, 0.8, 1.0); //해당 위치에 0.2, 0.3, 0.8, 1.0 데이터를 전달
+
     }
     draw(){
         const gl = this.gl;
diff --git a/src/fragment.frag b/src/fragment.frag
index 410c252..67ca4a9 100644
--- a/src/fragment.frag
+++ b/src/fragment.frag
@@ -1,7 +1,10 @@
 #version 300 es
 precision highp float;
 layout(location=0) out vec4 outColor;
+//in vec4 gl_FragCoord;
+//in vec2 gl_PointCoord;
+uniform vec4 u_color;
 
 void main() {
-  outColor = vec4(0.0,0.0,1.0,1.0);
+  outColor = u_color;
 }
\ No newline at end of file