X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbackends%2Fopengl%2Fpixelformat_backend.cpp;h=9cf796479c37d6ac7077aef33abe1255da16b4ac;hb=8a8cce8ef4ee28b3572a72958b8b407759f9f826;hp=7e2a61ea536655ee8b5f33031f18ef57abe8ce59;hpb=d279ad43486e287d4fe7e759e31b026949021260;p=libs%2Fgl.git

diff --git a/source/backends/opengl/pixelformat_backend.cpp b/source/backends/opengl/pixelformat_backend.cpp
index 7e2a61ea..9cf79647 100644
--- a/source/backends/opengl/pixelformat_backend.cpp
+++ b/source/backends/opengl/pixelformat_backend.cpp
@@ -11,9 +11,34 @@
 
 using namespace std;
 
+namespace {
+
+int swizzle_orders[] =
+{
+	GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA,
+	GL_RED, GL_RED, GL_RED, GL_ONE,
+	GL_RED, GL_RED, GL_RED, GL_GREEN,
+	GL_BLUE, GL_GREEN, GL_RED, GL_ALPHA,
+	GL_RED, GL_GREEN, GL_BLUE, GL_ONE
+};
+
+}
+
 namespace Msp {
 namespace GL {
 
+ComponentSwizzle get_required_swizzle(PixelComponents comp)
+{
+	switch(comp)
+	{
+	case BGR: return RGB_TO_BGR;
+	case BGRA: return RGB_TO_BGR;
+	case LUMINANCE: return R_TO_LUMINANCE;
+	case LUMINANCE_ALPHA: return RG_TO_LUMINANCE_ALPHA;
+	default: return NO_SWIZZLE;
+	}
+}
+
 void require_pixelformat(PixelFormat pf)
 {
 	/* TODO These checks are only accurate for textures.  On OpenGL ES some
@@ -106,5 +131,10 @@ unsigned get_gl_pixelformat(PixelFormat pf)
 	}
 }
 
+const int *get_gl_swizzle(ComponentSwizzle swiz)
+{
+	return swizzle_orders+4*swiz;
+}
+
 } // namespace GL
 } // namespace Msp