internal/graphicsdriver/opengl: refactoring

internal/graphicsdriver/opengl/context.go

@@ -127,7 +127,7 @@ type context struct {
 	highpOnce          sync.Once
 	initOnce           sync.Once
 
-	contextImpl
+	contextPlatform
 }
 
 func (c *context) bindTexture(t textureNative) {
@@ -156,7 +156,10 @@ func (c *context) bindFramebuffer(f framebufferNative) {
 
 func (c *context) setViewport(f *framebuffer) {
 	c.bindFramebuffer(f.native)
-	if c.lastViewportWidth != f.width || c.lastViewportHeight != f.height {
+	if c.lastViewportWidth == f.width && c.lastViewportHeight == f.height {
+		return
+	}
+
 	// On some environments, viewport size must be within the framebuffer size.
 	// e.g. Edge (#71), Chrome on GPD Pocket (#420), macOS Mojave (#691).
 	// Use the same size of the framebuffer here.
@@ -172,11 +175,14 @@ func (c *context) setViewport(f *framebuffer) {
 		c.lastViewportWidth = f.width
 		c.lastViewportHeight = f.height
 	}
-	}
 }
 
-func (c *context) getScreenFramebuffer() framebufferNative {
-	return c.screenFramebuffer
+func (c *context) newScreenFramebuffer(width, height int) *framebuffer {
+	return &framebuffer{
+		native: c.screenFramebuffer,
+		width:  width,
+		height: height,
+	}
 }
 
 func (c *context) getMaxTextureSize() int {
@@ -334,24 +340,28 @@ func (c *context) deleteRenderbuffer(r renderbufferNative) {
 	c.ctx.DeleteRenderbuffer(uint32(r))
 }
 
-func (c *context) newFramebuffer(texture textureNative) (framebufferNative, error) {
+func (c *context) newFramebuffer(texture textureNative, width, height int) (*framebuffer, error) {
 	f := c.ctx.CreateFramebuffer()
 	if f <= 0 {
-		return 0, fmt.Errorf("opengl: creating framebuffer failed: the returned value is not positive but %d", f)
+		return nil, fmt.Errorf("opengl: creating framebuffer failed: the returned value is not positive but %d", f)
 	}
 	c.bindFramebuffer(framebufferNative(f))
 
 	c.ctx.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, uint32(texture), 0)
 	if s := c.ctx.CheckFramebufferStatus(gl.FRAMEBUFFER); s != gl.FRAMEBUFFER_COMPLETE {
 		if s != 0 {
-			return 0, fmt.Errorf("opengl: creating framebuffer failed: %v", s)
+			return nil, fmt.Errorf("opengl: creating framebuffer failed: %v", s)
 		}
 		if e := c.ctx.GetError(); e != gl.NO_ERROR {
-			return 0, fmt.Errorf("opengl: creating framebuffer failed: (glGetError) %d", e)
+			return nil, fmt.Errorf("opengl: creating framebuffer failed: (glGetError) %d", e)
 		}
-		return 0, fmt.Errorf("opengl: creating framebuffer failed: unknown error")
+		return nil, fmt.Errorf("opengl: creating framebuffer failed: unknown error")
 	}
-	return framebufferNative(f), nil
+	return &framebuffer{
+		native: framebufferNative(f),
+		width:  width,
+		height: height,
+	}, nil
 }
 
 func (c *context) bindStencilBuffer(f framebufferNative, r renderbufferNative) error {
@@ -365,6 +375,9 @@ func (c *context) bindStencilBuffer(f framebufferNative, r renderbufferNative) e
 }
 
 func (c *context) deleteFramebuffer(f framebufferNative) {
+	if f == c.screenFramebuffer {
+		return
+	}
 	if !c.ctx.IsFramebuffer(uint32(f)) {
 		return
 	}

internal/graphicsdriver/opengl/context_js.go

@@ -16,9 +16,18 @@ package opengl
 
 import (
 	"syscall/js"
+
+	"github.com/hajimehoshi/ebiten/v2/internal/shaderir/glsl"
 )
 
-type contextImpl struct {
+type contextPlatform struct {
 	canvas js.Value
 	webGL2 bool
 }
+
+func (c *context) glslVersion() glsl.GLSLVersion {
+	if c.webGL2 {
+		return glsl.GLSLVersionES300
+	}
+	return glsl.GLSLVersionES100
+}

internal/graphicsdriver/opengl/context_notjs.go

@@ -16,5 +16,16 @@
 
 package opengl
 
-type contextImpl struct {
+import (
+	"github.com/hajimehoshi/ebiten/v2/internal/shaderir/glsl"
+)
+
+type contextPlatform struct {
+}
+
+func (c *context) glslVersion() glsl.GLSLVersion {
+	if c.ctx.IsES() {
+		return glsl.GLSLVersionES100
+	}
+	return glsl.GLSLVersionDefault
 }

internal/graphicsdriver/opengl/framebuffer.go

@@ -1,51 +0,0 @@
-// Copyright 2014 Hajime Hoshi
-//
-// 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 opengl
-
-// framebuffer is a wrapper of OpenGL's framebuffer.
-type framebuffer struct {
-	graphics *Graphics
-	native   framebufferNative
-	width    int
-	height   int
-}
-
-// newFramebufferFromTexture creates a framebuffer from the given texture.
-func newFramebufferFromTexture(context *context, texture textureNative, width, height int) (*framebuffer, error) {
-	native, err := context.newFramebuffer(texture)
-	if err != nil {
-		return nil, err
-	}
-	return &framebuffer{
-		native: native,
-		width:  width,
-		height: height,
-	}, nil
-}
-
-// newScreenFramebuffer creates a framebuffer for the screen.
-func newScreenFramebuffer(context *context, width, height int) *framebuffer {
-	return &framebuffer{
-		native: context.getScreenFramebuffer(),
-		width:  width,
-		height: height,
-	}
-}
-
-func (f *framebuffer) delete(context *context) {
-	if f.native != context.getScreenFramebuffer() {
-		context.deleteFramebuffer(f.native)
-	}
-}

internal/graphicsdriver/opengl/image.go

@@ -33,6 +33,14 @@ type Image struct {
 	screen      bool
 }
 
+// framebuffer is a wrapper of OpenGL's framebuffer.
+type framebuffer struct {
+	graphics *Graphics
+	native   framebufferNative
+	width    int
+	height   int
+}
+
 func (i *Image) ID() graphicsdriver.ImageID {
 	return i.id
 }
@@ -43,7 +51,7 @@ func (i *Image) IsInvalidated() bool {
 
 func (i *Image) Dispose() {
 	if i.framebuffer != nil {
-		i.framebuffer.delete(&i.graphics.context)
+		i.graphics.context.deleteFramebuffer(i.framebuffer.native)
 	}
 	if i.texture != 0 {
 		i.graphics.context.deleteTexture(i.texture)
@@ -90,10 +98,10 @@ func (i *Image) ensureFramebuffer() error {
 
 	w, h := i.framebufferSize()
 	if i.screen {
-		i.framebuffer = newScreenFramebuffer(&i.graphics.context, w, h)
+		i.framebuffer = i.graphics.context.newScreenFramebuffer(w, h)
 		return nil
 	}
-	f, err := newFramebufferFromTexture(&i.graphics.context, i.texture, w, h)
+	f, err := i.graphics.context.newFramebuffer(i.texture, w, h)
 	if err != nil {
 		return err
 	}

internal/graphicsdriver/opengl/shader_js.go

@@ -1,26 +0,0 @@
-// Copyright 2020 The Ebiten 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 opengl
-
-import (
-	"github.com/hajimehoshi/ebiten/v2/internal/shaderir/glsl"
-)
-
-func (c *context) glslVersion() glsl.GLSLVersion {
-	if c.webGL2 {
-		return glsl.GLSLVersionES300
-	}
-	return glsl.GLSLVersionES100
-}

internal/graphicsdriver/opengl/shader_notjs.go

@@ -1,28 +0,0 @@
-// Copyright 2020 The Ebiten 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 !js
-
-package opengl
-
-import (
-	"github.com/hajimehoshi/ebiten/v2/internal/shaderir/glsl"
-)
-
-func (c *context) glslVersion() glsl.GLSLVersion {
-	if c.ctx.IsES() {
-		return glsl.GLSLVersionES100
-	}
-	return glsl.GLSLVersionDefault
-}