diff --git a/app/internal/gpu/context.go b/app/internal/gpu/context.go
index ee66eb17..c5e10cd8 100644
--- a/app/internal/gpu/context.go
+++ b/app/internal/gpu/context.go
@@ -66,7 +66,10 @@ func floatTripleFor(ctx *context, ver [2]int, exts []string) (textureTriple, err
 	if ver[0] >= 3 {
 		triples = append(triples, textureTriple{gl.R16F, gl.Enum(gl.RED), gl.Enum(gl.HALF_FLOAT)})
 	}
-	if hasExtension(exts, "GL_OES_texture_half_float") || hasExtension(exts, "EXT_color_buffer_half_float") {
+	if hasExtension(exts, "GL_OES_texture_half_float") {
+		// Try single channel.
+		triples = append(triples, textureTriple{gl.LUMINANCE, gl.Enum(gl.LUMINANCE), gl.Enum(gl.HALF_FLOAT_OES)})
+		// Fallback to 4 channels.
 		triples = append(triples, textureTriple{gl.RGBA, gl.Enum(gl.RGBA), gl.Enum(gl.HALF_FLOAT_OES)})
 	}
 	if hasExtension(exts, "GL_OES_texture_float") || hasExtension(exts, "GL_EXT_color_buffer_float") {