From c6a6cc191813e8343a17b028146a34f193a6ce44 Mon Sep 17 00:00:00 2001
From: Roland Scheidegger <sroland@vmware.com>
Date: Fri, 27 Mar 2009 19:39:52 +0100
Subject: mesa: add new signed rgba texture format

This is a (partial) backport of the signed texture format support in OGL 3.1.
Since it wasn't promoted from an existing extension roll our own.
---
 src/mesa/main/texformat_tmp.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'src/mesa/main/texformat_tmp.h')

diff --git a/src/mesa/main/texformat_tmp.h b/src/mesa/main/texformat_tmp.h
index 0f6a172ef0..604b1a744c 100644
--- a/src/mesa/main/texformat_tmp.h
+++ b/src/mesa/main/texformat_tmp.h
@@ -1321,6 +1321,28 @@ static void FETCH(dudv8)(const struct gl_texture_image *texImage,
    texel[ACOMP] = 0;
 }
 
+/* MESA_FORMAT_SIGNED_ARGB8888 ***********************************************/
+
+static void FETCH(signed_rgba8888)( const struct gl_texture_image *texImage,
+			            GLint i, GLint j, GLint k, GLfloat *texel )
+{
+   const GLuint s = *TEXEL_ADDR(GLuint, texImage, i, j, k, 1);
+   texel[RCOMP] = BYTE_TO_FLOAT_TEX( (s >> 24)        );
+   texel[GCOMP] = BYTE_TO_FLOAT_TEX( (s >> 16) & 0xff );
+   texel[BCOMP] = BYTE_TO_FLOAT_TEX( (s >>  8) & 0xff );
+   texel[ACOMP] = BYTE_TO_FLOAT_TEX( (s      ) & 0xff );
+}
+
+#if DIM == 3
+static void store_texel_signed_rgba8888(struct gl_texture_image *texImage,
+                                        GLint i, GLint j, GLint k, const void *texel)
+{
+   const GLbyte *rgba = (const GLbyte *) texel;
+   GLuint *dst = TEXEL_ADDR(GLuint, texImage, i, j, k, 1);
+   *dst = PACK_COLOR_8888(rgba[RCOMP], rgba[GCOMP], rgba[BCOMP], rgba[ACOMP]);
+}
+#endif
+
 
 /* MESA_FORMAT_YCBCR *********************************************************/
 
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