mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
144 lines
3.8 KiB
Go
144 lines
3.8 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/graphicsdriver"
|
|
)
|
|
|
|
type blendFactor int
|
|
|
|
const (
|
|
glDstAlpha blendFactor = 0x0304
|
|
glDstColor blendFactor = 0x0306
|
|
glOne blendFactor = 1
|
|
glOneMinusDstAlpha blendFactor = 0x0305
|
|
glOneMinusSrcAlpha blendFactor = 0x0303
|
|
glSrcAlpha blendFactor = 0x0302
|
|
glZero blendFactor = 0
|
|
)
|
|
|
|
type blendOperation int
|
|
|
|
const (
|
|
glAdd blendOperation = 0x104
|
|
)
|
|
|
|
func convertBlendFactor(f graphicsdriver.BlendFactor) blendFactor {
|
|
switch f {
|
|
case graphicsdriver.BlendFactorZero:
|
|
return glZero
|
|
case graphicsdriver.BlendFactorOne:
|
|
return glOne
|
|
case graphicsdriver.BlendFactorSourceAlpha:
|
|
return glSrcAlpha
|
|
case graphicsdriver.BlendFactorDestinationAlpha:
|
|
return glDstAlpha
|
|
case graphicsdriver.BlendFactorOneMinusSourceAlpha:
|
|
return glOneMinusSrcAlpha
|
|
case graphicsdriver.BlendFactorOneMinusDestinationAlpha:
|
|
return glOneMinusDstAlpha
|
|
case graphicsdriver.BlendFactorDestinationColor:
|
|
return glDstColor
|
|
default:
|
|
panic(fmt.Sprintf("opengl: invalid blend factor %d", f))
|
|
}
|
|
}
|
|
|
|
func convertBlendOperation(o graphicsdriver.BlendOperation) blendOperation {
|
|
switch o {
|
|
case graphicsdriver.BlendOperationAdd:
|
|
return glAdd
|
|
default:
|
|
panic(fmt.Sprintf("opengl: invalid blend operation %d", o))
|
|
}
|
|
}
|
|
|
|
type context struct {
|
|
locationCache *locationCache
|
|
screenFramebuffer framebufferNative // This might not be the default frame buffer '0' (e.g. iOS).
|
|
lastFramebuffer framebufferNative
|
|
lastTexture textureNative
|
|
lastRenderbuffer renderbufferNative
|
|
lastViewportWidth int
|
|
lastViewportHeight int
|
|
lastBlend graphicsdriver.Blend
|
|
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) 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 {
|
|
// 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
|
|
}
|