graphicsdriver/opengl: Use GL_READ_WRITE at glMapBuffer

Updates #993
hajimehoshi · Nov 21, 2019 · 3df198f · 3df198f
1 parent 65fdf48
commit 3df198f
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diff --git a/internal/graphicsdriver/opengl/context_desktop.go b/internal/graphicsdriver/opengl/context_desktop.go
@@ -529,7 +529,7 @@ func (c *context) mapPixelBuffer(buffer buffer) unsafe.Pointer {
 	var ptr unsafe.Pointer
 	_ = c.t.Call(func() error {
 		gl.BindBuffer(gl.PIXEL_UNPACK_BUFFER, uint32(buffer))
-		ptr = gl.MapBuffer(gl.PIXEL_UNPACK_BUFFER, gl.WRITE_ONLY)
+		ptr = gl.MapBuffer(gl.PIXEL_UNPACK_BUFFER, gl.READ_WRITE)
 		return nil
 	})
 	return ptr

diff --git a/internal/graphicsdriver/opengl/gl/package.go b/internal/graphicsdriver/opengl/gl/package.go
@@ -47,6 +47,7 @@ const (
 	MAX_TEXTURE_SIZE     = 0x0D33
 	NEAREST              = 0x2600
 	NO_ERROR             = 0
+	READ_WRITE           = 0x88BA
 	RGBA                 = 0x1908
 	TEXTURE_2D           = 0x0DE1
 	TEXTURE_MAG_FILTER   = 0x2800