ebiten/internal/graphicsdriver/opengl/graphics_glfw.go

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// Copyright 2022 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 !android && !ios && !js && !nintendosdk && !playstation5
package opengl
import (
"fmt"
"runtime"
"github.com/hajimehoshi/ebiten/v2/internal/glfw"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl/gl"
"github.com/hajimehoshi/ebiten/v2/internal/microsoftgdk"
)
type graphicsPlatform struct {
window *glfw.Window
}
// NewGraphics creates an implementation of graphicsdriver.Graphics for OpenGL.
// The returned graphics value is nil iff the error is not nil.
func NewGraphics() (graphicsdriver.Graphics, error) {
if microsoftgdk.IsXbox() {
return nil, fmt.Errorf("opengl: OpenGL is not supported on Xbox")
}
ctx, err := gl.NewDefaultContext()
if err != nil {
return nil, err
}
if err := setGLFWClientAPI(ctx.IsES()); err != nil {
return nil, err
}
return newGraphics(ctx), nil
}
func setGLFWClientAPI(isES bool) error {
if isES {
if err := glfw.WindowHint(glfw.ClientAPI, glfw.OpenGLESAPI); err != nil {
return err
}
if err := glfw.WindowHint(glfw.ContextVersionMajor, 3); err != nil {
return err
}
if err := glfw.WindowHint(glfw.ContextVersionMinor, 0); err != nil {
return err
}
if err := glfw.WindowHint(glfw.ContextCreationAPI, glfw.EGLContextAPI); err != nil {
return err
}
return nil
}
if err := glfw.WindowHint(glfw.ClientAPI, glfw.OpenGLAPI); err != nil {
return err
}
if err := glfw.WindowHint(glfw.ContextVersionMajor, 3); err != nil {
return err
}
if err := glfw.WindowHint(glfw.ContextVersionMinor, 2); err != nil {
return err
}
// macOS requires forward-compatible and a core profile.
if runtime.GOOS == "darwin" {
if err := glfw.WindowHint(glfw.OpenGLForwardCompat, glfw.True); err != nil {
return err
}
if err := glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile); err != nil {
return err
}
}
return nil
}
func (g *Graphics) SetGLFWWindow(window *glfw.Window) {
g.window = window
}
func (g *Graphics) makeContextCurrent() error {
return g.window.MakeContextCurrent()
}
func (g *Graphics) swapBuffers() error {
// Call SwapIntervals even though vsync is not changed.
// When toggling to fullscreen, vsync state might be reset unexpectedly (#1787).
// SwapInterval is affected by the current monitor of the window.
// This needs to be called at least after SetMonitor.
// Without SwapInterval after SetMonitor, vsynch doesn't work (#375).
if g.vsync {
if err := glfw.SwapInterval(1); err != nil {
return err
}
} else {
if err := glfw.SwapInterval(0); err != nil {
return err
}
}
if err := g.window.SwapBuffers(); err != nil {
return err
}
return nil
}