woah une texture!

business-tycoon.asd

@@ -6,7 +6,7 @@
   :license  "Specify license here"
   :version "0.0.1"
   :serial t
-  :depends-on (#:cl-glfw3 #:cl-opengl #:trivial-main-thread #:cffi)
+  :depends-on (#:cl-glfw3 #:cl-opengl #:trivial-main-thread #:cffi #:png-read)
   :components ((:module "src"
 		:serial t
 		:components ((:file "package")

src/renderer.lisp

@@ -32,9 +32,11 @@ void main()
 (defparameter *vao* 0)
 (defparameter *ebo* 0)
 (defparameter *shader-program* nil)
+(defparameter *texture* nil)
 
 (defun init-renderer ()
   (setf *shader-program* (shader:load #p"src/shader.vert" #p"src/shader.frag"))
+  (setf *texture* (texture:load #p"textures/wall.png"))
   (setf *vbo* (gl:gen-buffer))
   (setf *ebo* (gl:gen-buffer))
   (setf *vao* (gl:gen-vertex-array))
@@ -42,17 +44,20 @@ void main()
   (gl:bind-vertex-array *vao*)
   (gl:bind-buffer :array-buffer *vbo*)
   (gl:bind-buffer :element-array-buffer *ebo*)
-  
-  (let* ((vertices #( 0.5 -0.5 0.0 1.0 0.0 0.0
-		     -0.5 -0.5 0.0 0.0 1.0 0.0
-		     0.0  0.5 0.0 0.0 0.0 1.0))
+ ;;                   positions       colors         texture coords
+  (let* ((vertices #( 0.5  0.5 0.0    1.0 0.0 0.0    1.0 1.0 ;; top right
+		      0.5 -0.5 0.0    0.0 1.0 0.0    1.0 0.0 ;; bottom right
+		     -0.5 -0.5 0.0    0.0 0.0 1.0    0.0 0.0 ;; bottom left
+		     -0.5  0.5 0.0    1.0 1.0 0.0    0.0 1.0 ;; top left
+		     ))
 	 (arr (gl:alloc-gl-array :float (length vertices))))
     (dotimes (i (length vertices))
       (setf (gl:glaref arr i) (aref vertices i)))
     (gl:buffer-data :array-buffer :static-draw arr)
     (gl:free-gl-array arr))
   
-  (let* ((indices #(0 1 2))
+  (let* ((indices #(0 1 3
+		    1 2 3))
 	 (arr (gl:alloc-gl-array :int (length indices))))
     (dotimes (i (length indices))
       (setf (gl:glaref arr i) (aref indices i)))
@@ -60,13 +65,17 @@ void main()
     (gl:free-gl-array arr))
   
   (gl:vertex-attrib-pointer 0 3 :float nil
-			    (* 6 (cffi:foreign-type-size :float))
+			    (* 8 (cffi:foreign-type-size :float))
 			    (cffi:null-pointer))
   (gl:enable-vertex-attrib-array 0)
   (gl:vertex-attrib-pointer 1 3 :float nil
-			    (* 6 (cffi:foreign-type-size :float))
+			    (* 8 (cffi:foreign-type-size :float))
 			    (cffi:make-pointer (* 3 (cffi:foreign-type-size :float))))
-  (gl:enable-vertex-attrib-array 1))
+  (gl:enable-vertex-attrib-array 1)
+  (gl:vertex-attrib-pointer 2 2 :float nil
+			    (* 8 (cffi:foreign-type-size :float))
+			    (cffi:make-pointer (* 6 (cffi:foreign-type-size :float))))
+  (gl:enable-vertex-attrib-array 2))
 
 (defun enable-wireframe ()
  (gl:polygon-mode :front-and-back :line))
@@ -83,13 +92,10 @@ void main()
 
 (defun render ()
   (gl:clear :color-buffer)
-  ;; (gl:with-pushed-matrix
-  ;;   (gl:color 1 1 1)
-  ;;   (gl:rect -25 -25 25 25))
-
   (shader:use *shader-program*)
+  (texture:bind *texture*)
   (gl:bind-vertex-array *vao*)
-  (gl:draw-elements :triangles (gl:make-null-gl-array :unsigned-int) :count 3)
+  (gl:draw-elements :triangles (gl:make-null-gl-array :unsigned-int) :count 6)
   (gl:bind-vertex-array 0)
 
   (glfw:swap-buffers))

src/shader.frag

@@ -2,8 +2,11 @@
 out vec4 FragColor;
 
 in vec3 ourColor;
+in vec2 TexCoord;
+
+uniform sampler2D ourTexture;
 
 void main()
 {
-    FragColor = vec4(ourColor, 1.0);
+    FragColor = texture(ourTexture, TexCoord);
 }

src/shader.vert

@@ -1,11 +1,14 @@
 #version 330 core
 layout (location = 0) in vec3 aPos;
 layout (location = 1) in vec3 aColor;
+layout (location = 2) in vec2 aTexCoord;
 
 out vec3 ourColor;
+out vec2 TexCoord;
 
 void main()
 {
     gl_Position = vec4(aPos, 1.0);
     ourColor = aColor;
+    TexCoord = aTexCoord;
 }

src/texture.lisp

@@ -0,0 +1,41 @@
+(defpackage #:texture
+  (:shadow #:load)
+  (:use #:cl)
+  (:export #:load #:bind))
+
+(in-package :texture)
+
+(defclass texture ()
+  ((id :accessor texture-id :initarg :id)))
+
+(defun load (png-image-path)
+  (let* ((texture (gl:gen-texture))
+	 (image (png-read:read-png-file png-image-path))
+	 (image-data (png-read:image-data image))
+	 (image-dimensions (array-dimensions image-data))
+	 (data (loop for w below (first image-dimensions)
+		     nconc (loop for h below (second image-dimensions)
+				 nconc (loop for c below (third image-dimensions)
+					     collect (aref image-data w h c)))))
+	 (format (case (png-read:colour-type image)
+		   (:truecolor-alpha :rgba)
+		   (:truecolor :rgb))))
+    (gl:bind-texture :texture-2d texture)
+    (gl:tex-parameter :texture-2d :texture-wrap-s :repeat)
+    (gl:tex-parameter :texture-2d :texture-wrap-t :repeat)
+    (gl:tex-parameter :texture-2d :texture-min-filter :linear)
+    (gl:tex-parameter :texture-2d :texture-mag-filter :linear)
+    (gl:tex-image-2d :texture-2d
+		     0
+		     :rgba
+		     (png-read:width image)
+		     (png-read:height image)
+		     0
+		     format
+		     :unsigned-byte
+		     (coerce data 'vector))
+    (gl:generate-mipmap :texture-2d)
+    (make-instance 'texture :id texture)))
+
+(defmethod bind ((self texture))
+  (gl:bind-texture :texture-2d (texture-id self)))