mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
120 lines
3.1 KiB
Go
120 lines
3.1 KiB
Go
// 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 (
|
|
"fmt"
|
|
"sync"
|
|
|
|
"github.com/hajimehoshi/ebiten/v2/internal/driver"
|
|
)
|
|
|
|
type operation int
|
|
|
|
func convertOperation(op driver.Operation) operation {
|
|
switch op {
|
|
case driver.Zero:
|
|
return zero
|
|
case driver.One:
|
|
return one
|
|
case driver.SrcAlpha:
|
|
return srcAlpha
|
|
case driver.DstAlpha:
|
|
return dstAlpha
|
|
case driver.OneMinusSrcAlpha:
|
|
return oneMinusSrcAlpha
|
|
case driver.OneMinusDstAlpha:
|
|
return oneMinusDstAlpha
|
|
case driver.DstColor:
|
|
return dstColor
|
|
default:
|
|
panic(fmt.Sprintf("opengl: invalid operation %d at convertOperation", op))
|
|
}
|
|
}
|
|
|
|
type context struct {
|
|
locationCache *locationCache
|
|
screenFramebuffer framebufferNative // This might not be the default frame buffer '0' (e.g. iOS).
|
|
lastFramebuffer framebufferNative
|
|
lastTexture textureNative
|
|
lastViewportWidth int
|
|
lastViewportHeight int
|
|
lastCompositeMode driver.CompositeMode
|
|
maxTextureSize int
|
|
maxTextureSizeOnce sync.Once
|
|
highp bool
|
|
highpOnce sync.Once
|
|
|
|
contextImpl
|
|
}
|
|
|
|
func (c *context) bindTexture(t textureNative) {
|
|
if c.lastTexture.equal(t) {
|
|
return
|
|
}
|
|
c.bindTextureImpl(t)
|
|
c.lastTexture = t
|
|
}
|
|
|
|
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 {
|
|
// 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)
|
|
|
|
// 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
|
|
}
|
|
}
|
|
}
|
|
|
|
func (c *context) getScreenFramebuffer() framebufferNative {
|
|
return c.screenFramebuffer
|
|
}
|
|
|
|
func (c *context) getMaxTextureSize() int {
|
|
c.maxTextureSizeOnce.Do(func() {
|
|
c.maxTextureSize = c.maxTextureSizeImpl()
|
|
})
|
|
return c.maxTextureSize
|
|
}
|
|
|
|
// highpPrecision represents an enough mantissa of float values in a shader.
|
|
const highpPrecision = 23
|
|
|
|
func (c *context) hasHighPrecisionFloat() bool {
|
|
c.highpOnce.Do(func() {
|
|
c.highp = c.getShaderPrecisionFormatPrecision() >= highpPrecision
|
|
})
|
|
return c.highp
|
|
}
|