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opengl: Use 'EXT' functions for framebuffers

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Some pretty old machines don't support OpenGL 3.x or later, and in
such environment, some framebuffer functions like glGenFramebuffers
are not available. Instead, EXT versions can be used even on
machines that don't support OpenGL 3.x.

After this change, Ebiten always tries to use EXT version of
framebuffer functions. I believe EXT version is always available
when non-EXT version is available, so this chang eshould be safe.

Fixes #602
This commit is contained in:
Hajime Hoshi 2018-05-09 00:33:25 +09:00
parent 92631e64ed
commit f5336ce7bc
1 changed files with 6 additions and 6 deletions
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12
internal/opengl/context_desktop.go
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@ -162,7 +162,7 @@ func (c *Context) NewTexture(width, height int) (Texture, error) {
func (c *Context) bindFramebufferImpl(f Framebuffer) { func (c *Context) bindFramebufferImpl(f Framebuffer) {
_ = c.runOnContextThread(func() error { _ = c.runOnContextThread(func() error {
gl.BindFramebuffer(gl.FRAMEBUFFER, uint32(f)) gl.BindFramebufferEXT(gl.FRAMEBUFFER, uint32(f))
return nil return nil
}) })
} }
@ -233,7 +233,7 @@ func (c *Context) NewFramebuffer(texture Texture) (Framebuffer, error) {
var framebuffer Framebuffer var framebuffer Framebuffer
var f uint32 var f uint32
if err := c.runOnContextThread(func() error { if err := c.runOnContextThread(func() error {
gl.GenFramebuffers(1, &f) gl.GenFramebuffersEXT(1, &f)
// TODO: Use gl.IsFramebuffer // TODO: Use gl.IsFramebuffer
if f <= 0 { if f <= 0 {
return errors.New("opengl: creating framebuffer failed: gl.IsFramebuffer returns false") return errors.New("opengl: creating framebuffer failed: gl.IsFramebuffer returns false")
@ -244,8 +244,8 @@ func (c *Context) NewFramebuffer(texture Texture) (Framebuffer, error) {
} }
c.bindFramebuffer(Framebuffer(f)) c.bindFramebuffer(Framebuffer(f))
if err := c.runOnContextThread(func() error { if err := c.runOnContextThread(func() error {
gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, uint32(texture), 0) gl.FramebufferTexture2DEXT(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, uint32(texture), 0)
s := gl.CheckFramebufferStatus(gl.FRAMEBUFFER) s := gl.CheckFramebufferStatusEXT(gl.FRAMEBUFFER)
if s != gl.FRAMEBUFFER_COMPLETE { if s != gl.FRAMEBUFFER_COMPLETE {
if s != 0 { if s != 0 {
return fmt.Errorf("opengl: creating framebuffer failed: %v", s) return fmt.Errorf("opengl: creating framebuffer failed: %v", s)
@ -273,7 +273,7 @@ func (c *Context) setViewportImpl(width, height int) {
func (c *Context) DeleteFramebuffer(f Framebuffer) { func (c *Context) DeleteFramebuffer(f Framebuffer) {
_ = c.runOnContextThread(func() error { _ = c.runOnContextThread(func() error {
ff := uint32(f) ff := uint32(f)
if !gl.IsFramebuffer(ff) { if !gl.IsFramebufferEXT(ff) {
return nil return nil
} }
if c.lastFramebuffer == f { if c.lastFramebuffer == f {
@ -281,7 +281,7 @@ func (c *Context) DeleteFramebuffer(f Framebuffer) {
c.lastViewportWidth = 0 c.lastViewportWidth = 0
c.lastViewportHeight = 0 c.lastViewportHeight = 0
} }
gl.DeleteFramebuffers(1, &ff) gl.DeleteFramebuffersEXT(1, &ff)
return nil return nil
}) })
} }