VBOs+attributes+drawing with VBOs

buffers/buffers.go

@@ -0,0 +1,35 @@
+package buffers
+
+import (
+	"github.com/bloeys/go-sdl-engine/logging"
+	"github.com/bloeys/go-sdl-engine/shaders"
+	"github.com/go-gl/gl/v4.6-compatibility/gl"
+)
+
+func HandleBuffers(sp shaders.ShaderProgram) {
+
+	//Create and fill Vertex buffer object
+	var vboID uint32
+	gl.CreateBuffers(1, &vboID)
+	if vboID == 0 {
+		logging.ErrLog.Println("Failed to create openGL buffer")
+	}
+
+	gl.BindBuffer(gl.ARRAY_BUFFER, vboID)
+
+	vertices := []float32{
+		-0.5, 0.5, 0,
+		0.5, 0.5, 0,
+		-0.5, -0.5, 0,
+
+		0.5, 0.5, 0,
+		0.5, -0.5, 0,
+		-0.5, -0.5, 0,
+	}
+	gl.BufferData(gl.ARRAY_BUFFER, 4*len(vertices), gl.Ptr(vertices), gl.STATIC_DRAW)
+
+	//Assign the VBO to vertPos attribute
+	vertPosLoc := sp.GetAttribLoc("vertPos")
+	gl.VertexAttribPointer(uint32(vertPosLoc), 3, gl.FLOAT, false, 3*4, gl.PtrOffset(0))
+	gl.EnableVertexAttribArray(uint32(vertPosLoc))
+}