Refator

draw/shaders/texture.fs

@@ -0,0 +1,9 @@
+#version 450 core
+out vec4 FragColor;
+in vec2 TexCoord;
+
+uniform sampler2D ourTexture;
+
+void main() {
+    FragColor = texture(ourTexture, TexCoord);
+}

draw/shaders/texture.vs

@@ -0,0 +1,25 @@
+#version 450 core
+
+layout (location = 0) in vec2 aPos;
+layout (location = 1) in vec2 aTexCoord;
+
+out vec2 TexCoord;
+
+uniform vec2 u_position;   //Position in scrren coordinates (pixel)
+uniform vec2 u_size;       //size in pixels (width, height)
+uniform vec2 u_resolution; //window resolution
+
+void main(){
+	//Covert from screen coordinated to normalized device corrdinates
+
+	//Screen coordinates: origin at top-left , y down
+
+	vec2 screen_pos = aPos * u_size + u_position;
+
+	vec2 ndc;
+	ndc.x = (screen_pos.x / u_resolution.x) * 2.0  - 1.0;
+	ndc.y = 1.0 - (screen_pos.y / u_resolution.x) * 2.0;
+
+	gl_Position = vec4(ndc, 0.0, 1.0);
+	TexCoord = aTexCoord;
+}