ebiten/internal/graphics/opengl/context.go

90 lines
2.2 KiB
Go
Raw Normal View History

2016-05-07 12:42:07 +02:00
// 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
2016-07-03 11:11:37 +02:00
var (
2016-05-07 12:42:07 +02:00
Nearest Filter
Linear Filter
VertexShader ShaderType
FragmentShader ShaderType
ArrayBuffer BufferType
ElementArrayBuffer BufferType
DynamicDraw BufferUsage
StaticDraw BufferUsage
Triangles Mode
Lines Mode
2016-07-03 11:11:37 +02:00
zero operation
one operation
srcAlpha operation
dstAlpha operation
oneMinusSrcAlpha operation
oneMinusDstAlpha operation
)
type Context struct {
2016-05-07 12:42:07 +02:00
locationCache *locationCache
screenFramebuffer Framebuffer // This might not be the default frame buffer '0' (e.g. iOS).
2016-05-31 19:33:31 +02:00
lastFramebuffer Framebuffer
lastTexture Texture
lastViewportWidth int
lastViewportHeight int
2016-05-07 12:42:07 +02:00
lastCompositeMode CompositeMode
context
}
2016-05-31 19:33:31 +02:00
func (c *Context) BindTexture(t Texture) error {
if c.lastTexture == 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 == 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 {
c.bindFramebuffer(f)
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
2016-05-31 19:33:31 +02:00
}
func (c *Context) ScreenFramebuffer() Framebuffer {
return c.screenFramebuffer
}
func (c *Context) ResetViewportSize() {
c.lastViewportWidth = 0
c.lastViewportHeight = 0
}