mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
120 lines
3.1 KiB
Go
120 lines
3.1 KiB
Go
// Copyright 2016 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package opengl
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import (
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"fmt"
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"sync"
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"github.com/hajimehoshi/ebiten/v2/internal/driver"
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)
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type operation int
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func convertOperation(op driver.Operation) operation {
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switch op {
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case driver.Zero:
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return zero
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case driver.One:
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return one
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case driver.SrcAlpha:
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return srcAlpha
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case driver.DstAlpha:
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return dstAlpha
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case driver.OneMinusSrcAlpha:
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return oneMinusSrcAlpha
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case driver.OneMinusDstAlpha:
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return oneMinusDstAlpha
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case driver.DstColor:
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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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}
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}
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type context struct {
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locationCache *locationCache
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screenFramebuffer framebufferNative // This might not be the default frame buffer '0' (e.g. iOS).
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lastFramebuffer framebufferNative
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lastTexture textureNative
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lastViewportWidth int
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lastViewportHeight int
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lastCompositeMode driver.CompositeMode
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maxTextureSize int
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maxTextureSizeOnce sync.Once
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highp bool
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highpOnce sync.Once
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contextImpl
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}
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func (c *context) bindTexture(t textureNative) {
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if c.lastTexture.equal(t) {
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return
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}
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c.bindTextureImpl(t)
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c.lastTexture = t
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}
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func (c *context) bindFramebuffer(f framebufferNative) {
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if c.lastFramebuffer.equal(f) {
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return
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}
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c.bindFramebufferImpl(f)
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c.lastFramebuffer = f
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}
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func (c *context) setViewport(f *framebuffer) {
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c.bindFramebuffer(f.native)
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if c.lastViewportWidth != f.width || c.lastViewportHeight != f.height {
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// On some environments, viewport size must be within the framebuffer size.
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// e.g. Edge (#71), Chrome on GPD Pocket (#420), macOS Mojave (#691).
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// Use the same size of the framebuffer here.
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c.setViewportImpl(f.width, f.height)
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// glViewport must be called at least at every frame on iOS.
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// As the screen framebuffer is the last render target, next SetViewport should be
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// the first call at a frame.
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if f.native.equal(c.screenFramebuffer) {
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c.lastViewportWidth = 0
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c.lastViewportHeight = 0
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} else {
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c.lastViewportWidth = f.width
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c.lastViewportHeight = f.height
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}
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}
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}
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func (c *context) getScreenFramebuffer() framebufferNative {
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return c.screenFramebuffer
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}
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func (c *context) getMaxTextureSize() int {
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c.maxTextureSizeOnce.Do(func() {
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c.maxTextureSize = c.maxTextureSizeImpl()
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})
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return c.maxTextureSize
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}
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// highpPrecision represents an enough mantissa of float values in a shader.
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const highpPrecision = 23
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func (c *context) hasHighPrecisionFloat() bool {
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c.highpOnce.Do(func() {
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c.highp = c.getShaderPrecisionFormatPrecision() >= highpPrecision
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})
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return c.highp
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}
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