ARB_texture_rg: Add R8 and RG8 texture formats

Unlike my AL1616 patches, this patch adds the new enums and the
entries to all the tables that are indexed with those enums.  This
should make bisecting across these changes a little easier.

These texture formats are not yet used by Mesa.

5 files changed, 247 insertions, 1 deletions

diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index 329b795074..226f0e9ddf 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -223,6 +223,33 @@ static struct gl_format_info format_info[MESA_FORMAT_COUNT] =
       1, 1, 2                      /* BlockWidth/Height,Bytes */
    },
    {
+      MESA_FORMAT_RG88,            /* Name */
+      "MESA_FORMAT_RG88",          /* StrName */
+      GL_RG,                       /* BaseFormat */
+      GL_UNSIGNED_NORMALIZED,      /* DataType */
+      8, 8, 0, 0,                  /* Red/Green/Blue/AlphaBits */
+      0, 0, 0, 0, 0,               /* Lum/Int/Index/Depth/StencilBits */
+      1, 1, 2                      /* BlockWidth/Height,Bytes */
+   },
+   {
+      MESA_FORMAT_RG88_REV,        /* Name */
+      "MESA_FORMAT_RG88_REV",      /* StrName */
+      GL_RG,                       /* BaseFormat */
+      GL_UNSIGNED_NORMALIZED,      /* DataType */
+      8, 8, 0, 0,                  /* Red/Green/Blue/AlphaBits */
+      0, 0, 0, 0, 0,               /* Lum/Int/Index/Depth/StencilBits */
+      1, 1, 2                      /* BlockWidth/Height,Bytes */
+   },
+   {
+      MESA_FORMAT_R8,              /* Name */
+      "MESA_FORMAT_R8",            /* StrName */
+      GL_RED,                      /* BaseFormat */
+      GL_UNSIGNED_NORMALIZED,      /* DataType */
+      8, 0, 0, 0,                  /* Red/Green/Blue/AlphaBits */
+      0, 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 */
@@ -934,6 +961,22 @@ _mesa_test_formats(void)
          assert(info->LuminanceBits == 0);
          assert(info->IntensityBits == 0);
       }
+      else if (info->BaseFormat == GL_RG) {
+         assert(info->RedBits > 0);
+         assert(info->GreenBits > 0);
+         assert(info->BlueBits == 0);
+         assert(info->AlphaBits == 0);
+         assert(info->LuminanceBits == 0);
+         assert(info->IntensityBits == 0);
+      }
+      else if (info->BaseFormat == GL_RED) {
+         assert(info->RedBits > 0);
+         assert(info->GreenBits == 0);
+         assert(info->BlueBits == 0);
+         assert(info->AlphaBits == 0);
+         assert(info->LuminanceBits == 0);
+         assert(info->IntensityBits == 0);
+      }
       else if (info->BaseFormat == GL_LUMINANCE) {
          assert(info->RedBits == 0);
          assert(info->GreenBits == 0);
diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
index 0eeeb8b2ba..3f8708b962 100644
--- a/src/mesa/main/formats.h
+++ b/src/mesa/main/formats.h
@@ -65,6 +65,9 @@ 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_RG88,		/*                     RRRR RRRR GGGG GGGG */
+   MESA_FORMAT_RG88_REV,	/*                     GGGG GGGG RRRR RRRR */
+   MESA_FORMAT_R8,		/*                               RRRR RRRR */
    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 f4f2be48c3..413d1346df 100644
--- a/src/mesa/main/texfetch.c
+++ b/src/mesa/main/texfetch.c
@@ -446,6 +446,27 @@ texfetch_funcs[MESA_FORMAT_COUNT] =
       store_texel_argb1555_rev
    },
    {
+      MESA_FORMAT_RG88,
+      fetch_texel_1d_f_rg88,
+      fetch_texel_2d_f_rg88,
+      fetch_texel_3d_f_rg88,
+      store_texel_rg88
+   },
+   {
+      MESA_FORMAT_RG88_REV,
+      fetch_texel_1d_f_rg88_rev,
+      fetch_texel_2d_f_rg88_rev,
+      fetch_texel_3d_f_rg88_rev,
+      store_texel_rg88_rev
+   },
+   {
+      MESA_FORMAT_R8,
+      fetch_texel_1d_f_r8,
+      fetch_texel_2d_f_r8,
+      fetch_texel_3d_f_r8,
+      store_texel_r8
+   },
+   {
       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 1f0d436236..a19e44e1f7 100644
--- a/src/mesa/main/texfetch_tmp.h
+++ b/src/mesa/main/texfetch_tmp.h
@@ -810,6 +810,78 @@ static void store_texel_argb1555_rev(struct gl_texture_image *texImage,
 #endif
 
 
+/* MESA_FORMAT_RG88 **********************************************************/
+
+/* Fetch texel from 1D, 2D or 3D rg88 texture, return 4 GLchans */
+static void FETCH(f_rg88)( const struct gl_texture_image *texImage,
+                           GLint i, GLint j, GLint k, GLfloat *texel )
+{
+   const GLushort s = *TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
+   texel[RCOMP] = UBYTE_TO_FLOAT( s >> 8 );
+   texel[GCOMP] = UBYTE_TO_FLOAT( s & 0xff );
+   texel[BCOMP] = 0.0;
+   texel[ACOMP] = 1.0;
+}
+
+#if DIM == 3
+static void store_texel_rg88(struct gl_texture_image *texImage,
+                             GLint i, GLint j, GLint k, const void *texel)
+{
+   const GLubyte *rgba = (const GLubyte *) texel;
+   GLushort *dst = TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
+   *dst = PACK_COLOR_88(rgba[RCOMP], rgba[GCOMP]);
+}
+#endif
+
+
+/* MESA_FORMAT_RG88_REV ******************************************************/
+
+/* Fetch texel from 1D, 2D or 3D rg88 texture, return 4 GLchans */
+static void FETCH(f_rg88_rev)( const struct gl_texture_image *texImage,
+                           GLint i, GLint j, GLint k, GLfloat *texel )
+{
+   const GLushort s = *TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
+   texel[RCOMP] = UBYTE_TO_FLOAT( s & 0xff );
+   texel[GCOMP] = UBYTE_TO_FLOAT( s >> 8 );
+   texel[BCOMP] = 0.0;
+   texel[ACOMP] = 1.0;
+}
+
+#if DIM == 3
+static void store_texel_rg88_rev(struct gl_texture_image *texImage,
+                             GLint i, GLint j, GLint k, const void *texel)
+{
+   const GLubyte *rgba = (const GLubyte *) texel;
+   GLushort *dst = TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
+   *dst = PACK_COLOR_88(rgba[GCOMP], rgba[RCOMP]);
+}
+#endif
+
+
+/* MESA_FORMAT_R8 ************************************************************/
+
+/* Fetch texel from 1D, 2D or 3D r8 texture, return 4 GLchans */
+static void FETCH(f_r8)( const struct gl_texture_image *texImage,
+                           GLint i, GLint j, GLint k, GLfloat *texel )
+{
+   const GLubyte *src = TEXEL_ADDR(GLubyte, texImage, i, j, k, 1);
+   texel[RCOMP] = UBYTE_TO_FLOAT( src[0] );
+   texel[GCOMP] = 0.0;
+   texel[BCOMP] = 0.0;
+   texel[ACOMP] = 1.0;
+}
+
+#if DIM == 3
+static void store_texel_r8(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 = rgba[RCOMP];
+}
+#endif
+
+
 /* MESA_FORMAT_AL88 **********************************************************/
 
 /* Fetch texel from 1D, 2D or 3D al88 texture, return 4 GLchans */
diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
index 5387eb1283..5ff1810e20 100644
--- a/src/mesa/main/texstore.c
+++ b/src/mesa/main/texstore.c
@@ -2047,6 +2047,109 @@ _mesa_texstore_argb1555(TEXSTORE_PARAMS)
 
 
 static GLboolean
+_mesa_texstore_rg88(TEXSTORE_PARAMS)
+{
+   const GLboolean littleEndian = _mesa_little_endian();
+   const GLuint texelBytes = _mesa_get_format_bytes(dstFormat);
+   const GLenum baseFormat = _mesa_get_format_base_format(dstFormat);
+
+   ASSERT(dstFormat == MESA_FORMAT_RG88 ||
+          dstFormat == MESA_FORMAT_RG88_REV);
+   ASSERT(texelBytes == 2);
+
+   if (!ctx->_ImageTransferState &&
+       !srcPacking->SwapBytes &&
+       dstFormat == MESA_FORMAT_RG88 &&
+       baseInternalFormat == GL_RG &&
+       srcFormat == GL_RG &&
+       srcType == GL_UNSIGNED_BYTE &&
+       littleEndian) {
+      /* simple memcpy path */
+      memcpy_texture(ctx, dims,
+                     dstFormat, dstAddr, dstXoffset, dstYoffset, dstZoffset,
+                     dstRowStride,
+                     dstImageOffsets,
+                     srcWidth, srcHeight, srcDepth, srcFormat, srcType,
+                     srcAddr, srcPacking);
+   }
+   else if (!ctx->_ImageTransferState &&
+	    littleEndian &&
+	    srcType == GL_UNSIGNED_BYTE &&
+	    can_swizzle(baseInternalFormat) &&
+	    can_swizzle(srcFormat)) {
+
+      GLubyte dstmap[4];
+
+      /* dstmap - how to swizzle from RGBA to dst format:
+       */
+      if ((littleEndian && dstFormat == MESA_FORMAT_RG88) ||
+	  (!littleEndian && dstFormat == MESA_FORMAT_RG88_REV)) {
+	 dstmap[0] = 0;
+	 dstmap[1] = 1;
+      }
+      else {
+	 dstmap[0] = 1;
+	 dstmap[1] = 0;
+      }
+      dstmap[2] = ZERO;		/* ? */
+      dstmap[3] = ONE;		/* ? */
+
+      _mesa_swizzle_ubyte_image(ctx, dims,
+				srcFormat,
+				srcType,
+				baseInternalFormat,
+				dstmap, 2,
+				dstAddr, dstXoffset, dstYoffset, dstZoffset,
+				dstRowStride, dstImageOffsets,
+				srcWidth, srcHeight, srcDepth, srcAddr,
+				srcPacking);
+   }
+   else {
+      /* 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;
+      _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
+      for (img = 0; img < srcDepth; img++) {
+         GLubyte *dstRow = (GLubyte *) dstAddr
+            + dstImageOffsets[dstZoffset + img] * texelBytes
+            + dstYoffset * dstRowStride
+            + dstXoffset * texelBytes;
+         for (row = 0; row < srcHeight; row++) {
+            GLushort *dstUS = (GLushort *) dstRow;
+            if (dstFormat == MESA_FORMAT_RG88) {
+               for (col = 0; col < srcWidth; col++) {
+                  /* src[0] is luminance, src[1] is alpha */
+                 dstUS[col] = PACK_COLOR_88( CHAN_TO_UBYTE(src[1]),
+                                             CHAN_TO_UBYTE(src[0]) );
+                 src += 2;
+               }
+            }
+            else {
+               for (col = 0; col < srcWidth; col++) {
+                  /* src[0] is luminance, src[1] is alpha */
+                 dstUS[col] = PACK_COLOR_88_REV( CHAN_TO_UBYTE(src[1]),
+                                                 CHAN_TO_UBYTE(src[0]) );
+                 src += 2;
+               }
+            }
+            dstRow += dstRowStride;
+         }
+      }
+      _mesa_free((void *) tempImage);
+   }
+   return GL_TRUE;
+}
+
+
+static GLboolean
 _mesa_texstore_al88(TEXSTORE_PARAMS)
 {
    const GLboolean littleEndian = _mesa_little_endian();
@@ -2286,7 +2389,8 @@ _mesa_texstore_a8(TEXSTORE_PARAMS)
 
    ASSERT(dstFormat == MESA_FORMAT_A8 ||
           dstFormat == MESA_FORMAT_L8 ||
-          dstFormat == MESA_FORMAT_I8);
+          dstFormat == MESA_FORMAT_I8 ||
+          dstFormat == MESA_FORMAT_R8);
    ASSERT(texelBytes == 1);
 
    if (!ctx->_ImageTransferState &&
@@ -3147,6 +3251,9 @@ 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_RG88, _mesa_texstore_rg88 },
+   { MESA_FORMAT_RG88_REV, _mesa_texstore_rg88 },
+   { MESA_FORMAT_R8, _mesa_texstore_a8 },
    { MESA_FORMAT_AL88, _mesa_texstore_al88 },
    { MESA_FORMAT_AL88_REV, _mesa_texstore_al88 },
    { MESA_FORMAT_AL1616, _mesa_texstore_al1616 },