mirror of
https://github.com/hajimehoshi/ebiten.git
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67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
package opengl
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// #cgo LDFLAGS: -framework OpenGL
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//
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// #include <OpenGL/gl.h>
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// #include <stdlib.h>
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import "C"
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import (
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"github.com/hajimehoshi/go.ebiten/graphics"
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"github.com/hajimehoshi/go.ebiten/graphics/matrix"
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)
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type Device struct {
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screenWidth int
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screenHeight int
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screenScale int
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graphicsContext *GraphicsContext
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offscreenTexture graphics.Texture
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drawFunc func(graphics.GraphicsContext, graphics.Texture)
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}
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func NewDevice(screenWidth, screenHeight, screenScale int,
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drawFunc func(graphics.GraphicsContext, graphics.Texture)) *Device {
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device := &Device{
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screenWidth: screenWidth,
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screenHeight: screenHeight,
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screenScale: screenScale,
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graphicsContext: newGraphicsContext(screenWidth, screenHeight, screenScale),
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drawFunc: drawFunc,
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}
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device.offscreenTexture =
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device.graphicsContext.NewTexture(screenWidth, screenHeight)
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return device
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}
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func (device *Device) Update() {
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g := device.graphicsContext
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C.glEnable(C.GL_TEXTURE_2D)
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C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MIN_FILTER, C.GL_NEAREST)
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C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MAG_FILTER, C.GL_NEAREST)
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g.SetOffscreen(device.offscreenTexture.ID)
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g.Clear()
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device.drawFunc(g, device.offscreenTexture)
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g.flush()
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C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MIN_FILTER, C.GL_LINEAR)
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C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MAG_FILTER, C.GL_LINEAR)
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g.resetOffscreen()
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g.Clear()
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scale := float64(g.screenScale)
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geometryMatrix := matrix.Geometry{
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[2][3]float64{
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{scale, 0, 0},
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{0, scale, 0},
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},
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}
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g.DrawTexture(device.offscreenTexture.ID,
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0, 0, device.screenWidth, device.screenHeight,
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geometryMatrix, matrix.IdentityColor())
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g.flush()
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}
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func (device *Device) TextureFactory() graphics.TextureFactory {
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return device.graphicsContext
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}
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