ebiten/internal/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
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var (
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Nearest Filter
Linear Filter
VertexShader ShaderType
FragmentShader ShaderType
ArrayBuffer BufferType
ElementArrayBuffer BufferType
DynamicDraw BufferUsage
StaticDraw BufferUsage
Triangles Mode
Lines Mode
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Short DataType
Float DataType
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zero operation
one operation
srcAlpha operation
dstAlpha operation
oneMinusSrcAlpha operation
oneMinusDstAlpha operation
)
type Context struct {
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locationCache *locationCache
screenFramebuffer Framebuffer // This might not be the default frame buffer '0' (e.g. iOS).
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lastFramebuffer Framebuffer
lastTexture Texture
lastViewportWidth int
lastViewportHeight int
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lastCompositeMode CompositeMode
context
}
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var theContext *Context
func GetContext() *Context {
return theContext
}
func (c *Context) BindTexture(t Texture) error {
if c.lastTexture.equals(t) {
return nil
}
if err := c.bindTextureImpl(t); err != nil {
return err
}
c.lastTexture = t
return nil
}
func (c *Context) bindFramebuffer(f Framebuffer) error {
if c.lastFramebuffer.equals(f) {
return nil
}
if err := c.bindFramebufferImpl(f); err != nil {
return err
}
c.lastFramebuffer = f
return nil
}
func (c *Context) SetViewport(f Framebuffer, width, height int) error {
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if err := c.bindFramebuffer(f); err != nil {
return err
}
if c.lastViewportWidth != width || c.lastViewportHeight != height {
if err := c.setViewportImpl(width, height); err != nil {
return nil
}
c.lastViewportWidth = width
c.lastViewportHeight = height
}
return nil
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}
func (c *Context) ScreenFramebuffer() Framebuffer {
return c.screenFramebuffer
}
func (c *Context) ResetViewportSize() {
c.lastViewportWidth = 0
c.lastViewportHeight = 0
}