ebiten/internal/graphicsdriver/opengl/context.go

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// Copyright 2016 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
import (
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"fmt"
"sync"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
)
type operation int
func convertOperation(op graphicsdriver.Operation) operation {
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switch op {
case graphicsdriver.Zero:
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return zero
case graphicsdriver.One:
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return one
case graphicsdriver.SrcAlpha:
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return srcAlpha
case graphicsdriver.DstAlpha:
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return dstAlpha
case graphicsdriver.OneMinusSrcAlpha:
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return oneMinusSrcAlpha
case graphicsdriver.OneMinusDstAlpha:
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return oneMinusDstAlpha
case graphicsdriver.DstColor:
return dstColor
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default:
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panic(fmt.Sprintf("opengl: invalid operation %d at convertOperation", op))
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}
}
type context struct {
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locationCache *locationCache
screenFramebuffer framebufferNative // This might not be the default frame buffer '0' (e.g. iOS).
lastFramebuffer framebufferNative
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lastTexture textureNative
lastRenderbuffer renderbufferNative
lastViewportWidth int
lastViewportHeight int
lastCompositeMode graphicsdriver.CompositeMode
maxTextureSize int
maxTextureSizeOnce sync.Once
highp bool
highpOnce sync.Once
contextImpl
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}
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func (c *context) bindTexture(t textureNative) {
if c.lastTexture.equal(t) {
return
}
c.bindTextureImpl(t)
c.lastTexture = t
}
func (c *context) bindRenderbuffer(r renderbufferNative) {
if c.lastRenderbuffer.equal(r) {
return
}
c.bindRenderbufferImpl(r)
c.lastRenderbuffer = r
}
func (c *context) bindFramebuffer(f framebufferNative) {
if c.lastFramebuffer.equal(f) {
return
}
c.bindFramebufferImpl(f)
c.lastFramebuffer = f
}
func (c *context) setViewport(f *framebuffer) {
c.bindFramebuffer(f.native)
if c.lastViewportWidth != f.width || c.lastViewportHeight != f.height {
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// 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.
c.setViewportImpl(f.width, f.height)
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// glViewport must be called at least at every frame on iOS.
// As the screen framebuffer is the last render target, next SetViewport should be
// the first call at a frame.
if f.native.equal(c.screenFramebuffer) {
c.lastViewportWidth = 0
c.lastViewportHeight = 0
} else {
c.lastViewportWidth = f.width
c.lastViewportHeight = f.height
}
}
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}
func (c *context) getScreenFramebuffer() framebufferNative {
return c.screenFramebuffer
}
func (c *context) getMaxTextureSize() int {
c.maxTextureSizeOnce.Do(func() {
c.maxTextureSize = c.maxTextureSizeImpl()
})
return c.maxTextureSize
}