tofu

commit bdcf1967a838b2f2c0b5fc73c9a0c206c4e83195
parent 08820a0fe9c3eebac8fff31cbbbf55b4cdeaa958
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Fri, 18 Oct 2024 17:34:27 +0900

hello triangle

Diffstat:
M
cmd/sample/main.go
 | 
24
++++++++++++++++++++----

1 file changed, 20 insertions(+), 4 deletions(-)
diff --git a/cmd/sample/main.go b/cmd/sample/main.go
@@ -76,6 +76,10 @@ var vertices = []float32{
 	0.0, 0.5, 0.0,
 }
 
+var indices = []uint32{
+	0, 1, 2,
+}
+
 const vertexShaderSource = `#version 330 core
 layout (location = 0) in vec3 aPos;
 void main() {
@@ -123,22 +127,34 @@ func main() {
 	if err != nil {
 		log.Fatalf("link shaders: %v", err)
 	}
-	gl.UseProgram(shaderProgram)
 	gl.DeleteShader(vertexShader)
 	gl.DeleteShader(fragmentShader)
 
-	window.SetFramebufferSizeCallback(framebufferSizeCallback)
-
-	var VBO uint32
+	var VBO, VAO, EBO uint32
+	gl.GenVertexArrays(1, &VAO)
 	gl.GenBuffers(1, &VBO)
+	gl.GenBuffers(1, &EBO)
+	gl.BindVertexArray(VAO)
 	gl.BindBuffer(gl.ARRAY_BUFFER, VBO)
 	gl.BufferData(gl.ARRAY_BUFFER, len(vertices) * 4,
 		gl.Ptr(vertices), gl.STATIC_DRAW)
+	gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, EBO)
+	gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(indices) * 4,
+		gl.Ptr(indices), gl.STATIC_DRAW)
+	gl.VertexAttribPointer(0, 3, gl.FLOAT, false, 3*4, nil)
+	gl.EnableVertexAttribArray(0)
+	gl.BindBuffer(gl.ARRAY_BUFFER, 0);
+	gl.BindVertexArray(0)
+
+	window.SetFramebufferSizeCallback(framebufferSizeCallback)
 
 	for !window.ShouldClose() {
 		processInput(window)
 		gl.ClearColor(0.2, 0.3, 0.3, 1.0)
 		gl.Clear(gl.COLOR_BUFFER_BIT)
+		gl.UseProgram(shaderProgram)
+		gl.BindVertexArray(VAO)
+		gl.DrawElements(gl.TRIANGLES, 3, gl.UNSIGNED_INT, nil)
 		window.SwapBuffers()
 		glfw.PollEvents()
 	}