internal/graphicsdriver/opengl: add a debug mode with a build tag ebitenginegldebug

In the debug mode, GetError is inserted in each GL function call.

Closes #2650

doc.go

@@ -102,6 +102,9 @@
 // `ebitenginedebug` outputs a log of graphics commands. This is useful to know what happens in Ebitengine. In general, the
 // number of graphics commands affects the performance of your game.
 //
+// `ebitenginegldebug` enables a debug mode for OpenGL. This is valid only when the graphics library is OpenGL.
+// This affects performance very much.
+//
 // `ebitenginesinglethread` disables Ebitengine's thread safety to unlock maximum performance. If you use this you will have
 // to manage threads yourself. Functions like IsKeyPressed will no longer be concurrent-safe with this build tag.
 // They must be called from the main thread or the same goroutine as the given game's callback functions like Update

internal/graphicsdriver/opengl/gl/debug.go

@@ -0,0 +1,627 @@
+// Copyright 2023 The Ebitengine Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gl
+
+import (
+	"fmt"
+	"os"
+)
+
+type DebugContext struct {
+	Context Context
+}
+
+var _ Context = (*DebugContext)(nil)
+
+func (d *DebugContext) ActiveTexture(arg0 uint32) {
+	d.Context.ActiveTexture(arg0)
+	fmt.Fprintln(os.Stderr, "ActiveTexture")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at ActiveTexture", e))
+	}
+}
+
+func (d *DebugContext) AttachShader(arg0 uint32, arg1 uint32) {
+	d.Context.AttachShader(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "AttachShader")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at AttachShader", e))
+	}
+}
+
+func (d *DebugContext) BindAttribLocation(arg0 uint32, arg1 uint32, arg2 string) {
+	d.Context.BindAttribLocation(arg0, arg1, arg2)
+	fmt.Fprintln(os.Stderr, "BindAttribLocation")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at BindAttribLocation", e))
+	}
+}
+
+func (d *DebugContext) BindBuffer(arg0 uint32, arg1 uint32) {
+	d.Context.BindBuffer(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "BindBuffer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at BindBuffer", e))
+	}
+}
+
+func (d *DebugContext) BindFramebuffer(arg0 uint32, arg1 uint32) {
+	d.Context.BindFramebuffer(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "BindFramebuffer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at BindFramebuffer", e))
+	}
+}
+
+func (d *DebugContext) BindRenderbuffer(arg0 uint32, arg1 uint32) {
+	d.Context.BindRenderbuffer(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "BindRenderbuffer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at BindRenderbuffer", e))
+	}
+}
+
+func (d *DebugContext) BindTexture(arg0 uint32, arg1 uint32) {
+	d.Context.BindTexture(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "BindTexture")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at BindTexture", e))
+	}
+}
+
+func (d *DebugContext) BlendEquationSeparate(arg0 uint32, arg1 uint32) {
+	d.Context.BlendEquationSeparate(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "BlendEquationSeparate")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at BlendEquationSeparate", e))
+	}
+}
+
+func (d *DebugContext) BlendFuncSeparate(arg0 uint32, arg1 uint32, arg2 uint32, arg3 uint32) {
+	d.Context.BlendFuncSeparate(arg0, arg1, arg2, arg3)
+	fmt.Fprintln(os.Stderr, "BlendFuncSeparate")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at BlendFuncSeparate", e))
+	}
+}
+
+func (d *DebugContext) BufferInit(arg0 uint32, arg1 int, arg2 uint32) {
+	d.Context.BufferInit(arg0, arg1, arg2)
+	fmt.Fprintln(os.Stderr, "BufferInit")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at BufferInit", e))
+	}
+}
+
+func (d *DebugContext) BufferSubData(arg0 uint32, arg1 int, arg2 []uint8) {
+	d.Context.BufferSubData(arg0, arg1, arg2)
+	fmt.Fprintln(os.Stderr, "BufferSubData")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at BufferSubData", e))
+	}
+}
+
+func (d *DebugContext) CheckFramebufferStatus(arg0 uint32) uint32 {
+	out0 := d.Context.CheckFramebufferStatus(arg0)
+	fmt.Fprintln(os.Stderr, "CheckFramebufferStatus")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at CheckFramebufferStatus", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) Clear(arg0 uint32) {
+	d.Context.Clear(arg0)
+	fmt.Fprintln(os.Stderr, "Clear")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Clear", e))
+	}
+}
+
+func (d *DebugContext) ColorMask(arg0 bool, arg1 bool, arg2 bool, arg3 bool) {
+	d.Context.ColorMask(arg0, arg1, arg2, arg3)
+	fmt.Fprintln(os.Stderr, "ColorMask")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at ColorMask", e))
+	}
+}
+
+func (d *DebugContext) CompileShader(arg0 uint32) {
+	d.Context.CompileShader(arg0)
+	fmt.Fprintln(os.Stderr, "CompileShader")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at CompileShader", e))
+	}
+}
+
+func (d *DebugContext) CreateBuffer() uint32 {
+	out0 := d.Context.CreateBuffer()
+	fmt.Fprintln(os.Stderr, "CreateBuffer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at CreateBuffer", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) CreateFramebuffer() uint32 {
+	out0 := d.Context.CreateFramebuffer()
+	fmt.Fprintln(os.Stderr, "CreateFramebuffer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at CreateFramebuffer", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) CreateProgram() uint32 {
+	out0 := d.Context.CreateProgram()
+	fmt.Fprintln(os.Stderr, "CreateProgram")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at CreateProgram", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) CreateRenderbuffer() uint32 {
+	out0 := d.Context.CreateRenderbuffer()
+	fmt.Fprintln(os.Stderr, "CreateRenderbuffer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at CreateRenderbuffer", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) CreateShader(arg0 uint32) uint32 {
+	out0 := d.Context.CreateShader(arg0)
+	fmt.Fprintln(os.Stderr, "CreateShader")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at CreateShader", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) CreateTexture() uint32 {
+	out0 := d.Context.CreateTexture()
+	fmt.Fprintln(os.Stderr, "CreateTexture")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at CreateTexture", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) DeleteBuffer(arg0 uint32) {
+	d.Context.DeleteBuffer(arg0)
+	fmt.Fprintln(os.Stderr, "DeleteBuffer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at DeleteBuffer", e))
+	}
+}
+
+func (d *DebugContext) DeleteFramebuffer(arg0 uint32) {
+	d.Context.DeleteFramebuffer(arg0)
+	fmt.Fprintln(os.Stderr, "DeleteFramebuffer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at DeleteFramebuffer", e))
+	}
+}
+
+func (d *DebugContext) DeleteProgram(arg0 uint32) {
+	d.Context.DeleteProgram(arg0)
+	fmt.Fprintln(os.Stderr, "DeleteProgram")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at DeleteProgram", e))
+	}
+}
+
+func (d *DebugContext) DeleteRenderbuffer(arg0 uint32) {
+	d.Context.DeleteRenderbuffer(arg0)
+	fmt.Fprintln(os.Stderr, "DeleteRenderbuffer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at DeleteRenderbuffer", e))
+	}
+}
+
+func (d *DebugContext) DeleteShader(arg0 uint32) {
+	d.Context.DeleteShader(arg0)
+	fmt.Fprintln(os.Stderr, "DeleteShader")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at DeleteShader", e))
+	}
+}
+
+func (d *DebugContext) DeleteTexture(arg0 uint32) {
+	d.Context.DeleteTexture(arg0)
+	fmt.Fprintln(os.Stderr, "DeleteTexture")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at DeleteTexture", e))
+	}
+}
+
+func (d *DebugContext) Disable(arg0 uint32) {
+	d.Context.Disable(arg0)
+	fmt.Fprintln(os.Stderr, "Disable")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Disable", e))
+	}
+}
+
+func (d *DebugContext) DisableVertexAttribArray(arg0 uint32) {
+	d.Context.DisableVertexAttribArray(arg0)
+	fmt.Fprintln(os.Stderr, "DisableVertexAttribArray")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at DisableVertexAttribArray", e))
+	}
+}
+
+func (d *DebugContext) DrawElements(arg0 uint32, arg1 int32, arg2 uint32, arg3 int) {
+	d.Context.DrawElements(arg0, arg1, arg2, arg3)
+	fmt.Fprintln(os.Stderr, "DrawElements")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at DrawElements", e))
+	}
+}
+
+func (d *DebugContext) Enable(arg0 uint32) {
+	d.Context.Enable(arg0)
+	fmt.Fprintln(os.Stderr, "Enable")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Enable", e))
+	}
+}
+
+func (d *DebugContext) EnableVertexAttribArray(arg0 uint32) {
+	d.Context.EnableVertexAttribArray(arg0)
+	fmt.Fprintln(os.Stderr, "EnableVertexAttribArray")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at EnableVertexAttribArray", e))
+	}
+}
+
+func (d *DebugContext) Flush() {
+	d.Context.Flush()
+	fmt.Fprintln(os.Stderr, "Flush")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Flush", e))
+	}
+}
+
+func (d *DebugContext) FramebufferRenderbuffer(arg0 uint32, arg1 uint32, arg2 uint32, arg3 uint32) {
+	d.Context.FramebufferRenderbuffer(arg0, arg1, arg2, arg3)
+	fmt.Fprintln(os.Stderr, "FramebufferRenderbuffer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at FramebufferRenderbuffer", e))
+	}
+}
+
+func (d *DebugContext) FramebufferTexture2D(arg0 uint32, arg1 uint32, arg2 uint32, arg3 uint32, arg4 int32) {
+	d.Context.FramebufferTexture2D(arg0, arg1, arg2, arg3, arg4)
+	fmt.Fprintln(os.Stderr, "FramebufferTexture2D")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at FramebufferTexture2D", e))
+	}
+}
+
+func (d *DebugContext) GetError() uint32 {
+	out0 := d.Context.GetError()
+	fmt.Fprintln(os.Stderr, "GetError")
+	return out0
+}
+
+func (d *DebugContext) GetInteger(arg0 uint32) int {
+	out0 := d.Context.GetInteger(arg0)
+	fmt.Fprintln(os.Stderr, "GetInteger")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at GetInteger", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) GetProgramInfoLog(arg0 uint32) string {
+	out0 := d.Context.GetProgramInfoLog(arg0)
+	fmt.Fprintln(os.Stderr, "GetProgramInfoLog")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at GetProgramInfoLog", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) GetProgrami(arg0 uint32, arg1 uint32) int {
+	out0 := d.Context.GetProgrami(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "GetProgrami")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at GetProgrami", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) GetShaderInfoLog(arg0 uint32) string {
+	out0 := d.Context.GetShaderInfoLog(arg0)
+	fmt.Fprintln(os.Stderr, "GetShaderInfoLog")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at GetShaderInfoLog", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) GetShaderi(arg0 uint32, arg1 uint32) int {
+	out0 := d.Context.GetShaderi(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "GetShaderi")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at GetShaderi", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) GetUniformLocation(arg0 uint32, arg1 string) int32 {
+	out0 := d.Context.GetUniformLocation(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "GetUniformLocation")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at GetUniformLocation", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) IsES() bool {
+	out0 := d.Context.IsES()
+	return out0
+}
+
+func (d *DebugContext) IsFramebuffer(arg0 uint32) bool {
+	out0 := d.Context.IsFramebuffer(arg0)
+	fmt.Fprintln(os.Stderr, "IsFramebuffer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at IsFramebuffer", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) IsProgram(arg0 uint32) bool {
+	out0 := d.Context.IsProgram(arg0)
+	fmt.Fprintln(os.Stderr, "IsProgram")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at IsProgram", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) IsRenderbuffer(arg0 uint32) bool {
+	out0 := d.Context.IsRenderbuffer(arg0)
+	fmt.Fprintln(os.Stderr, "IsRenderbuffer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at IsRenderbuffer", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) IsTexture(arg0 uint32) bool {
+	out0 := d.Context.IsTexture(arg0)
+	fmt.Fprintln(os.Stderr, "IsTexture")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at IsTexture", e))
+	}
+	return out0
+}
+
+func (d *DebugContext) LinkProgram(arg0 uint32) {
+	d.Context.LinkProgram(arg0)
+	fmt.Fprintln(os.Stderr, "LinkProgram")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at LinkProgram", e))
+	}
+}
+
+func (d *DebugContext) LoadFunctions() error {
+	out0 := d.Context.LoadFunctions()
+	return out0
+}
+
+func (d *DebugContext) PixelStorei(arg0 uint32, arg1 int32) {
+	d.Context.PixelStorei(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "PixelStorei")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at PixelStorei", e))
+	}
+}
+
+func (d *DebugContext) ReadPixels(arg0 []uint8, arg1 int32, arg2 int32, arg3 int32, arg4 int32, arg5 uint32, arg6 uint32) {
+	d.Context.ReadPixels(arg0, arg1, arg2, arg3, arg4, arg5, arg6)
+	fmt.Fprintln(os.Stderr, "ReadPixels")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at ReadPixels", e))
+	}
+}
+
+func (d *DebugContext) RenderbufferStorage(arg0 uint32, arg1 uint32, arg2 int32, arg3 int32) {
+	d.Context.RenderbufferStorage(arg0, arg1, arg2, arg3)
+	fmt.Fprintln(os.Stderr, "RenderbufferStorage")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at RenderbufferStorage", e))
+	}
+}
+
+func (d *DebugContext) Scissor(arg0 int32, arg1 int32, arg2 int32, arg3 int32) {
+	d.Context.Scissor(arg0, arg1, arg2, arg3)
+	fmt.Fprintln(os.Stderr, "Scissor")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Scissor", e))
+	}
+}
+
+func (d *DebugContext) ShaderSource(arg0 uint32, arg1 string) {
+	d.Context.ShaderSource(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "ShaderSource")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at ShaderSource", e))
+	}
+}
+
+func (d *DebugContext) StencilFunc(arg0 uint32, arg1 int32, arg2 uint32) {
+	d.Context.StencilFunc(arg0, arg1, arg2)
+	fmt.Fprintln(os.Stderr, "StencilFunc")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at StencilFunc", e))
+	}
+}
+
+func (d *DebugContext) StencilOp(arg0 uint32, arg1 uint32, arg2 uint32) {
+	d.Context.StencilOp(arg0, arg1, arg2)
+	fmt.Fprintln(os.Stderr, "StencilOp")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at StencilOp", e))
+	}
+}
+
+func (d *DebugContext) TexImage2D(arg0 uint32, arg1 int32, arg2 int32, arg3 int32, arg4 int32, arg5 uint32, arg6 uint32, arg7 []uint8) {
+	d.Context.TexImage2D(arg0, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
+	fmt.Fprintln(os.Stderr, "TexImage2D")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at TexImage2D", e))
+	}
+}
+
+func (d *DebugContext) TexParameteri(arg0 uint32, arg1 uint32, arg2 int32) {
+	d.Context.TexParameteri(arg0, arg1, arg2)
+	fmt.Fprintln(os.Stderr, "TexParameteri")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at TexParameteri", e))
+	}
+}
+
+func (d *DebugContext) TexSubImage2D(arg0 uint32, arg1 int32, arg2 int32, arg3 int32, arg4 int32, arg5 int32, arg6 uint32, arg7 uint32, arg8 []uint8) {
+	d.Context.TexSubImage2D(arg0, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8)
+	fmt.Fprintln(os.Stderr, "TexSubImage2D")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at TexSubImage2D", e))
+	}
+}
+
+func (d *DebugContext) Uniform1fv(arg0 int32, arg1 []float32) {
+	d.Context.Uniform1fv(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "Uniform1fv")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Uniform1fv", e))
+	}
+}
+
+func (d *DebugContext) Uniform1i(arg0 int32, arg1 int32) {
+	d.Context.Uniform1i(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "Uniform1i")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Uniform1i", e))
+	}
+}
+
+func (d *DebugContext) Uniform1iv(arg0 int32, arg1 []int32) {
+	d.Context.Uniform1iv(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "Uniform1iv")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Uniform1iv", e))
+	}
+}
+
+func (d *DebugContext) Uniform2fv(arg0 int32, arg1 []float32) {
+	d.Context.Uniform2fv(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "Uniform2fv")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Uniform2fv", e))
+	}
+}
+
+func (d *DebugContext) Uniform2iv(arg0 int32, arg1 []int32) {
+	d.Context.Uniform2iv(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "Uniform2iv")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Uniform2iv", e))
+	}
+}
+
+func (d *DebugContext) Uniform3fv(arg0 int32, arg1 []float32) {
+	d.Context.Uniform3fv(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "Uniform3fv")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Uniform3fv", e))
+	}
+}
+
+func (d *DebugContext) Uniform3iv(arg0 int32, arg1 []int32) {
+	d.Context.Uniform3iv(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "Uniform3iv")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Uniform3iv", e))
+	}
+}
+
+func (d *DebugContext) Uniform4fv(arg0 int32, arg1 []float32) {
+	d.Context.Uniform4fv(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "Uniform4fv")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Uniform4fv", e))
+	}
+}
+
+func (d *DebugContext) Uniform4iv(arg0 int32, arg1 []int32) {
+	d.Context.Uniform4iv(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "Uniform4iv")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Uniform4iv", e))
+	}
+}
+
+func (d *DebugContext) UniformMatrix2fv(arg0 int32, arg1 []float32) {
+	d.Context.UniformMatrix2fv(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "UniformMatrix2fv")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at UniformMatrix2fv", e))
+	}
+}
+
+func (d *DebugContext) UniformMatrix3fv(arg0 int32, arg1 []float32) {
+	d.Context.UniformMatrix3fv(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "UniformMatrix3fv")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at UniformMatrix3fv", e))
+	}
+}
+
+func (d *DebugContext) UniformMatrix4fv(arg0 int32, arg1 []float32) {
+	d.Context.UniformMatrix4fv(arg0, arg1)
+	fmt.Fprintln(os.Stderr, "UniformMatrix4fv")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at UniformMatrix4fv", e))
+	}
+}
+
+func (d *DebugContext) UseProgram(arg0 uint32) {
+	d.Context.UseProgram(arg0)
+	fmt.Fprintln(os.Stderr, "UseProgram")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at UseProgram", e))
+	}
+}
+
+func (d *DebugContext) VertexAttribPointer(arg0 uint32, arg1 int32, arg2 uint32, arg3 bool, arg4 int32, arg5 int) {
+	d.Context.VertexAttribPointer(arg0, arg1, arg2, arg3, arg4, arg5)
+	fmt.Fprintln(os.Stderr, "VertexAttribPointer")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at VertexAttribPointer", e))
+	}
+}
+
+func (d *DebugContext) Viewport(arg0 int32, arg1 int32, arg2 int32, arg3 int32) {
+	d.Context.Viewport(arg0, arg1, arg2, arg3)
+	fmt.Fprintln(os.Stderr, "Viewport")
+	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %d at Viewport", e))
+	}
+}

internal/graphicsdriver/opengl/gl/gen.go

@@ -0,0 +1,143 @@
+// Copyright 2023 The Ebitengine Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build ignore
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"reflect"
+	"strings"
+
+	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl/gl"
+)
+
+func main() {
+	if err := run(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+func run() error {
+	f, err := os.Create("debug.go")
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	if _, err := f.WriteString(`// Copyright 2023 The Ebitengine Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gl
+
+import (
+	"fmt"
+	"os"
+)
+
+type DebugContext struct {
+	Context Context
+}
+
+var _ Context = (*DebugContext)(nil)
+`); err != nil {
+		return err
+	}
+
+	t := reflect.TypeOf((*gl.Context)(nil)).Elem()
+	for i := 0; i < t.NumMethod(); i++ {
+		m := t.Method(i)
+		name := m.Name
+
+		var argNames []string
+		var argNamesAndTypes []string
+		for j := 0; j < m.Type.NumIn(); j++ {
+			n := fmt.Sprintf("arg%d", j)
+			argNames = append(argNames, n)
+			argNamesAndTypes = append(argNamesAndTypes, n+" "+typeName(m.Type.In(j)))
+		}
+
+		var outTypes []string
+		var outNames []string
+		for j := 0; j < m.Type.NumOut(); j++ {
+			outTypes = append(outTypes, typeName(m.Type.Out(j)))
+			outNames = append(outNames, fmt.Sprintf("out%d", j))
+		}
+
+		if _, err := fmt.Fprintf(f, "\nfunc (d *DebugContext) %s(%s) (%s) {\n", name, strings.Join(argNamesAndTypes, ", "), strings.Join(outTypes, ",")); err != nil {
+			return err
+		}
+		if len(outTypes) > 0 {
+			if _, err := fmt.Fprintf(f, "\t%s := ", strings.Join(outNames, ", ")); err != nil {
+				return err
+			}
+		} else {
+			if _, err := fmt.Fprintf(f, "\t"); err != nil {
+				return err
+			}
+		}
+		if _, err := fmt.Fprintf(f, "d.Context.%s(%s)\n", name, strings.Join(argNames, ", ")); err != nil {
+			return err
+		}
+
+		// Print logs.
+		if name != "LoadFunctions" && name != "IsES" {
+			if _, err := fmt.Fprintf(f, "\tfmt.Fprintln(os.Stderr, %q)\n", name); err != nil {
+				return err
+			}
+		}
+
+		// Check errors.
+		if name != "LoadFunctions" && name != "IsES" && name != "GetError" {
+			if _, err := fmt.Fprintf(f, `	if e := d.Context.GetError(); e != NO_ERROR {
+		panic(fmt.Sprintf("gl: GetError() returned %%d at %s", e))
+	}
+`, name); err != nil {
+				return err
+			}
+		}
+
+		if len(outTypes) > 0 {
+			if _, err := fmt.Fprintf(f, "\treturn %s\n", strings.Join(outNames, ", ")); err != nil {
+				return err
+			}
+		}
+		if _, err := fmt.Fprintf(f, "}\n"); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func typeName(t reflect.Type) string {
+	if t.Kind() == reflect.Slice {
+		return "[]" + typeName(t.Elem())
+	}
+	return t.Name()
+}

internal/graphicsdriver/opengl/gl/interface.go

@@ -14,6 +14,9 @@
 
 package gl
 
+//go:generate go run gen.go
+//go:generate gofmt -s -w .
+
 // Context is a context for OpenGL (ES) functions.
 //
 // Context is basically the same as gomobile's gl.Context.

internal/graphicsdriver/opengl/graphics.go

@@ -52,6 +52,16 @@ type Graphics struct {
 	activatedTextures []activatedTexture
 }
 
+func newGraphics(ctx gl.Context) *Graphics {
+	g := &Graphics{}
+	if isDebug {
+		g.context.ctx = &gl.DebugContext{Context: ctx}
+	} else {
+		g.context.ctx = ctx
+	}
+	return g
+}
+
 func (g *Graphics) Begin() error {
 	// Do nothing.
 	return nil

internal/graphicsdriver/opengl/graphics_debug.go

@@ -0,0 +1,19 @@
+// Copyright 2023 The Ebitengine Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build ebitenginegldebug
+
+package opengl
+
+const isDebug = true

internal/graphicsdriver/opengl/graphics_default.go

@@ -36,7 +36,5 @@ func NewGraphics() (graphicsdriver.Graphics, error) {
 		return nil, err
 	}
 
-	g := &Graphics{}
+	return newGraphics(ctx), nil
-	g.context.ctx = ctx
-	return g, nil
 }

internal/graphicsdriver/opengl/graphics_js.go

@@ -43,9 +43,8 @@ func NewGraphics(canvas js.Value) (graphicsdriver.Graphics, error) {
 		return nil, err
 	}
 
-	g := &Graphics{}
+	g := newGraphics(ctx)
 	g.context.canvas = canvas
-	g.context.ctx = ctx
 
 	return g, nil
 }

internal/graphicsdriver/opengl/graphics_mobile.go

@@ -37,8 +37,5 @@ func NewGraphics(context mgl.Context) (graphicsdriver.Graphics, error) {
 		}
 	}
 
-	g := &Graphics{}
+	return newGraphics(ctx), nil
-	g.context.ctx = ctx
-
-	return g, nil
 }

internal/graphicsdriver/opengl/graphics_notdebug.go

@@ -0,0 +1,19 @@
+// Copyright 2023 The Ebitengine Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !ebitenginegldebug
+
+package opengl
+
+const isDebug = false