mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
package rendertarget
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// #cgo LDFLAGS: -framework OpenGL
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//
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// #include <OpenGL/gl.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/opengl/texture"
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gtexture "github.com/hajimehoshi/go-ebiten/graphics/texture"
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)
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type Framebuffer C.GLuint
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func createFramebuffer(nativeTexture C.GLuint) Framebuffer {
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framebuffer := C.GLuint(0)
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C.glGenFramebuffers(1, &framebuffer)
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origFramebuffer := C.GLint(0)
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C.glGetIntegerv(C.GL_FRAMEBUFFER_BINDING, &origFramebuffer)
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C.glBindFramebuffer(C.GL_FRAMEBUFFER, framebuffer)
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defer C.glBindFramebuffer(C.GL_FRAMEBUFFER, C.GLuint(origFramebuffer))
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C.glFramebufferTexture2D(C.GL_FRAMEBUFFER, C.GL_COLOR_ATTACHMENT0,
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C.GL_TEXTURE_2D, nativeTexture, 0)
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if C.glCheckFramebufferStatus(C.GL_FRAMEBUFFER) !=
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C.GL_FRAMEBUFFER_COMPLETE {
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panic("creating framebuffer failed")
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}
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// Set this framebuffer opaque because alpha values on a target might be
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// confusing.
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C.glClearColor(0, 0, 0, 1)
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C.glClear(C.GL_COLOR_BUFFER_BIT)
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return Framebuffer(framebuffer)
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}
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type framebufferCreator struct {
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}
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func (f *framebufferCreator) Create(native interface{}) interface{} {
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return createFramebuffer(C.GLuint(native.(texture.Native)))
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}
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func Create(width, height int, filter graphics.Filter) (
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*gtexture.RenderTarget, *gtexture.Texture, error) {
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tex, err := texture.Create(width, height, filter)
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if err != nil {
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return nil, nil, err
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}
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return tex.CreateRenderTarget(&framebufferCreator{}), tex, nil
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}
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func CreateWithFramebuffer(width, height int, framebuffer Framebuffer) (
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*gtexture.RenderTarget, error) {
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return gtexture.NewRenderTarget(framebuffer, width, height), nil
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}
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