mesa: implement new texture format AL44

Radeon GPUs can do this. R600 can even do render-to-texture.
Packing and extracting aren't implemented, but we shouldn't hit them (I think).
Tested with swrast, softpipe, and r300g.

7 files changed, 95 insertions, 1 deletions

diff --git a/src/mesa/main/colormac.h b/src/mesa/main/colormac.h
index f00faa5beef..065f9f937a2 100644
--- a/src/mesa/main/colormac.h
+++ b/src/mesa/main/colormac.h
@@ -208,6 +208,9 @@ do {						\
 #define PACK_COLOR_4444_REV( R, G, B, A )				\
    ((((B) & 0xf0) << 8) | (((A) & 0xf0) << 4) | ((R) & 0xf0) | ((G) >> 4))
 
+#define PACK_COLOR_44( L, A )						\
+   (((L) & 0xf0) | (((A) & 0xf0) >> 4))
+
 #define PACK_COLOR_88( L, A )						\
    (((L) << 8) | (A))
 
diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index 0975407214d..90296f434c0 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -222,6 +222,15 @@ static struct gl_format_info format_info[MESA_FORMAT_COUNT] =
       1, 1, 2                      /* BlockWidth/Height,Bytes */
    },
    {
+      MESA_FORMAT_AL44,            /* Name */
+      "MESA_FORMAT_AL44",          /* StrName */
+      GL_LUMINANCE_ALPHA,          /* BaseFormat */
+      GL_UNSIGNED_NORMALIZED,      /* DataType */
+      0, 0, 0, 4,                  /* Red/Green/Blue/AlphaBits */
+      4, 0, 0, 0, 0,               /* Lum/Int/Index/Depth/StencilBits */
+      1, 1, 1                      /* BlockWidth/Height,Bytes */
+   },
+   {
       MESA_FORMAT_AL88,            /* Name */
       "MESA_FORMAT_AL88",          /* StrName */
       GL_LUMINANCE_ALPHA,          /* BaseFormat */
@@ -1270,6 +1279,7 @@ _mesa_format_to_type_and_comps(gl_format format,
       *comps = 4;
       return;
 
+   case MESA_FORMAT_AL44: /* XXX this isn't plain GL_UNSIGNED_BYTE */
    case MESA_FORMAT_AL88:
    case MESA_FORMAT_AL88_REV:
    case MESA_FORMAT_RG88:
diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
index c147376ea25..db63fde3f2d 100644
--- a/src/mesa/main/formats.h
+++ b/src/mesa/main/formats.h
@@ -65,6 +65,7 @@ typedef enum
    MESA_FORMAT_RGBA5551,        /*                     RRRR RGGG GGBB BBBA */
    MESA_FORMAT_ARGB1555,	/*                     ARRR RRGG GGGB BBBB */
    MESA_FORMAT_ARGB1555_REV,	/*                     GGGB BBBB ARRR RRGG */
+   MESA_FORMAT_AL44,		/*                               AAAA LLLL */
    MESA_FORMAT_AL88,		/*                     AAAA AAAA LLLL LLLL */
    MESA_FORMAT_AL88_REV,	/*                     LLLL LLLL AAAA AAAA */
    MESA_FORMAT_AL1616,          /* AAAA AAAA AAAA AAAA LLLL LLLL LLLL LLLL */
diff --git a/src/mesa/main/texfetch.c b/src/mesa/main/texfetch.c
index dff5963117e..5c7e728c136 100644
--- a/src/mesa/main/texfetch.c
+++ b/src/mesa/main/texfetch.c
@@ -237,6 +237,13 @@ texfetch_funcs[MESA_FORMAT_COUNT] =
       store_texel_argb1555_rev
    },
    {
+      MESA_FORMAT_AL44,
+      fetch_texel_1d_f_al44,
+      fetch_texel_2d_f_al44,
+      fetch_texel_3d_f_al44,
+      store_texel_al44
+   },
+   {
       MESA_FORMAT_AL88,
       fetch_texel_1d_f_al88,
       fetch_texel_2d_f_al88,
diff --git a/src/mesa/main/texfetch_tmp.h b/src/mesa/main/texfetch_tmp.h
index c985de92908..b6ffdd09f94 100644
--- a/src/mesa/main/texfetch_tmp.h
+++ b/src/mesa/main/texfetch_tmp.h
@@ -883,6 +883,30 @@ static void store_texel_rg88_rev(struct gl_texture_image *texImage,
 #endif
 
 
+/* MESA_FORMAT_AL44 **********************************************************/
+
+/* Fetch texel from 1D, 2D or 3D al44 texture, return 4 GLchans */
+static void FETCH(f_al44)( const struct gl_texture_image *texImage,
+                           GLint i, GLint j, GLint k, GLfloat *texel )
+{
+   const GLubyte s = *TEXEL_ADDR(GLubyte, texImage, i, j, k, 1);
+   texel[RCOMP] =
+   texel[GCOMP] =
+   texel[BCOMP] = UBYTE_TO_FLOAT( (s & 0x0f) << 4 );
+   texel[ACOMP] = UBYTE_TO_FLOAT(  s & 0xf0 );
+}
+
+#if DIM == 3
+static void store_texel_al44(struct gl_texture_image *texImage,
+                             GLint i, GLint j, GLint k, const void *texel)
+{
+   const GLubyte *rgba = (const GLubyte *) texel;
+   GLubyte *dst = TEXEL_ADDR(GLubyte, texImage, i, j, k, 1);
+   *dst = PACK_COLOR_44(rgba[ACOMP], rgba[RCOMP]);
+}
+#endif
+
+
 /* MESA_FORMAT_AL88 **********************************************************/
 
 /* Fetch texel from 1D, 2D or 3D al88 texture, return 4 GLchans */
diff --git a/src/mesa/main/texformat.c b/src/mesa/main/texformat.c
index 9d30a7e30c6..fb738fc6354 100644
--- a/src/mesa/main/texformat.c
+++ b/src/mesa/main/texformat.c
@@ -117,9 +117,11 @@ _mesa_choose_tex_format( struct gl_context *ctx, GLint internalFormat,
          return MESA_FORMAT_L8;
 
       /* Luminance/Alpha formats */
+      case GL_LUMINANCE4_ALPHA4:
+         return MESA_FORMAT_AL44;
+
       case 2:
       case GL_LUMINANCE_ALPHA:
-      case GL_LUMINANCE4_ALPHA4:
       case GL_LUMINANCE6_ALPHA2:
       case GL_LUMINANCE8_ALPHA8:
          return MESA_FORMAT_AL88;
diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
index b14ffe84b67..f9ab9469022 100644
--- a/src/mesa/main/texstore.c
+++ b/src/mesa/main/texstore.c
@@ -2113,6 +2113,52 @@ _mesa_texstore_argb2101010(TEXSTORE_PARAMS)
 
 
 /**
+ * Do texstore for 2-channel, 4-bit/channel, unsigned normalized formats.
+ */
+static GLboolean
+_mesa_texstore_unorm44(TEXSTORE_PARAMS)
+{
+   const GLuint texelBytes = _mesa_get_format_bytes(dstFormat);
+   const GLenum baseFormat = _mesa_get_format_base_format(dstFormat);
+
+   ASSERT(dstFormat == MESA_FORMAT_AL44);
+   ASSERT(texelBytes == 1);
+
+   {
+      /* general path */
+      const GLchan *tempImage = _mesa_make_temp_chan_image(ctx, dims,
+                                                 baseInternalFormat,
+                                                 baseFormat,
+                                                 srcWidth, srcHeight, srcDepth,
+                                                 srcFormat, srcType, srcAddr,
+                                                 srcPacking);
+      const GLchan *src = tempImage;
+      GLint img, row, col;
+      if (!tempImage)
+         return GL_FALSE;
+      for (img = 0; img < srcDepth; img++) {
+         GLubyte *dstRow = (GLubyte *) dstAddr
+            + dstImageOffsets[dstZoffset + img] * texelBytes
+            + dstYoffset * dstRowStride
+            + dstXoffset * texelBytes;
+         for (row = 0; row < srcHeight; row++) {
+            GLubyte *dstUS = (GLubyte *) dstRow;
+            for (col = 0; col < srcWidth; col++) {
+               /* src[0] is luminance, src[1] is alpha */
+               dstUS[col] = PACK_COLOR_44( CHAN_TO_UBYTE(src[1]),
+                                           CHAN_TO_UBYTE(src[0]) );
+               src += 2;
+            }
+            dstRow += dstRowStride;
+         }
+      }
+      free((void *) tempImage);
+   }
+   return GL_TRUE;
+}
+
+
+/**
  * Do texstore for 2-channel, 8-bit/channel, unsigned normalized formats.
  */
 static GLboolean
@@ -3995,6 +4041,7 @@ texstore_funcs[MESA_FORMAT_COUNT] =
    { MESA_FORMAT_RGBA5551, _mesa_texstore_rgba5551 },
    { MESA_FORMAT_ARGB1555, _mesa_texstore_argb1555 },
    { MESA_FORMAT_ARGB1555_REV, _mesa_texstore_argb1555 },
+   { MESA_FORMAT_AL44, _mesa_texstore_unorm44 },
    { MESA_FORMAT_AL88, _mesa_texstore_unorm88 },
    { MESA_FORMAT_AL88_REV, _mesa_texstore_unorm88 },
    { MESA_FORMAT_AL1616, _mesa_texstore_unorm1616 },