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internal/graphicsdriver/opengl: use an appropriate stencil buffer format

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This commit is contained in:
Hajime Hoshi 2022-11-17 13:31:36 +09:00
parent 21670691b1
commit 4de6da0a50
3 changed files with 24 additions and 18 deletions
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25
internal/graphicsdriver/opengl/context.go
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@ -316,7 +316,30 @@ func (c *context) newRenderbuffer(width, height int) (renderbufferNative, error)
renderbuffer := renderbufferNative(r)
c.bindRenderbuffer(renderbuffer)
c.ctx.RenderbufferStorage(gl.RENDERBUFFER, c.stencilFormat(), int32(width), int32(height))
var stencilFormat uint32
if c.ctx.IsES() {
// https://docs.gl/es2/glRenderbufferStorage
// > Must be one of the following symbolic constants: GL_RGBA4, GL_RGB565, GL_RGB5_A1,
// > GL_DEPTH_COMPONENT16, or GL_STENCIL_INDEX8.
//
// https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/renderbufferStorage
// > A GLenum specifying the internal format of the renderbuffer. Possible values:
// > * gl.RGBA4: 4 red bits, 4 green bits, 4 blue bits 4 alpha bits.
// > * gl.RGB565: 5 red bits, 6 green bits, 5 blue bits.
// > * gl.RGB5_A1: 5 red bits, 5 green bits, 5 blue bits, 1 alpha bit.
// > * gl.DEPTH_COMPONENT16: 16 depth bits.
// > * gl.STENCIL_INDEX8: 8 stencil bits.
// > * gl.DEPTH_STENCIL
stencilFormat = gl.STENCIL_INDEX8
} else {
// GL_STENCIL_INDEX8 might not be available with OpenGL 2.1.
// https://www.khronos.org/opengl/wiki/Image_Format
// > There are only 2 depth/stencil formats, each providing 8 stencil bits: GL_DEPTH24_STENCIL8 and GL_DEPTH32F_STENCIL8.
// > [...]
// > Stencil formats can only be used for Textures if OpenGL 4.4 or ARB_texture_stencil8 is available.
stencilFormat = gl.DEPTH24_STENCIL8
}
c.ctx.RenderbufferStorage(gl.RENDERBUFFER, stencilFormat, int32(width), int32(height))
return renderbuffer, nil
}

7
internal/graphicsdriver/opengl/context_js.go
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@ -16,16 +16,9 @@ package opengl
import (
"syscall/js"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl/gl"
)
type contextImpl struct {
canvas js.Value
webGL2 bool
}
func (*context) stencilFormat() uint32 {
// gl.DEPTH24_STENCIL8 is not available on WebGL1.
return gl.STENCIL_INDEX8
}

10
internal/graphicsdriver/opengl/context_notjs.go
View File

@ -16,15 +16,5 @@
package opengl
import (
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl/gl"
)
type contextImpl struct {
}
func (*context) stencilFormat() uint32 {
// GL_STENCIL_INDEX8 might not be available with OpenGL 2.1.
// https://www.khronos.org/opengl/wiki/Image_Format
return gl.DEPTH24_STENCIL8
}