Add SetDataWithUsage

buffers/buffers.go

@@ -30,7 +30,28 @@ func (b *Buffer) SetData(values []float32) {
 	gl.BindVertexArray(b.VAOID)
 	gl.BindBuffer(gl.ARRAY_BUFFER, b.BufID)
 
-	gl.BufferData(gl.ARRAY_BUFFER, len(values)*4, gl.Ptr(values), BufUsage_Static.ToGL())
+	sizeInBytes := len(values) * 4
+	if sizeInBytes == 0 {
+		gl.BufferData(gl.ARRAY_BUFFER, 0, gl.Ptr(nil), BufUsage_Static.ToGL())
+	} else {
+		gl.BufferData(gl.ARRAY_BUFFER, sizeInBytes, gl.Ptr(&values[0]), BufUsage_Static.ToGL())
+	}
+
+	gl.BindVertexArray(0)
+	gl.BindBuffer(gl.ARRAY_BUFFER, 0)
+}
+
+func (b *Buffer) SetDataWithUsage(values []float32, usage BufUsage) {
+
+	gl.BindVertexArray(b.VAOID)
+	gl.BindBuffer(gl.ARRAY_BUFFER, b.BufID)
+
+	sizeInBytes := len(values) * 4
+	if sizeInBytes == 0 {
+		gl.BufferData(gl.ARRAY_BUFFER, 0, gl.Ptr(nil), usage.ToGL())
+	} else {
+		gl.BufferData(gl.ARRAY_BUFFER, sizeInBytes, gl.Ptr(&values[0]), usage.ToGL())
+	}
 
 	gl.BindVertexArray(0)
 	gl.BindBuffer(gl.ARRAY_BUFFER, 0)
@@ -42,7 +63,12 @@ func (b *Buffer) SetIndexBufData(values []uint32) {
 	gl.BindVertexArray(b.VAOID)
 	gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, b.IndexBufID)
 
-	gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(values)*4, gl.Ptr(values), BufUsage_Static.ToGL())
+	sizeInBytes := len(values) * 4
+	if sizeInBytes == 0 {
+		gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, 0, gl.Ptr(nil), BufUsage_Static.ToGL())
+	} else {
+		gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, sizeInBytes, gl.Ptr(&values[0]), BufUsage_Static.ToGL())
+	}
 
 	gl.BindVertexArray(0)
 	gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0)

ui/imgui/imgui.go

@@ -66,8 +66,7 @@ func (i *ImguiInfo) Render(winWidth, winHeight float32, fbWidth, fbHeight int32)
 	// DisplayMin is typically (0,0) for single viewport apps.
 
 	i.Mat.Bind()
-
-	gl.Uniform1i(gl.GetUniformLocation(i.Mat.ShaderProg.ID, gl.Str("Texture\x00")), 0)
+	i.Mat.SetUnifInt32("Texture", 0)
 
 	//PERF: only update the ortho matrix on window resize
 	orthoMat := gglm.Ortho(0, float32(winWidth), 0, float32(winHeight), 0, 20)