ebiten/graphics/opengl/device.go
2013-06-21 01:56:24 +09:00

67 lines
1.8 KiB
Go

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