mesa: implement new texture format A16

7 files changed, 58 insertions, 8 deletions

diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index 90296f434c0..efbd4a2c25d 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -285,6 +285,15 @@ static struct gl_format_info format_info[MESA_FORMAT_COUNT] =
       1, 1, 1                      /* BlockWidth/Height,Bytes */
    },
    {
+      MESA_FORMAT_A16,             /* Name */
+      "MESA_FORMAT_A16",           /* StrName */
+      GL_ALPHA,                    /* BaseFormat */
+      GL_UNSIGNED_NORMALIZED,      /* DataType */
+      0, 0, 0, 16,                 /* Red/Green/Blue/AlphaBits */
+      0, 0, 0, 0, 0,               /* Lum/Int/Index/Depth/StencilBits */
+      1, 1, 2                      /* BlockWidth/Height,Bytes */
+   },
+   {
       MESA_FORMAT_L8,              /* Name */
       "MESA_FORMAT_L8",            /* StrName */
       GL_LUMINANCE,                /* BaseFormat */
@@ -1297,6 +1306,7 @@ _mesa_format_to_type_and_comps(gl_format format,
       return;
 
    case MESA_FORMAT_R16:
+   case MESA_FORMAT_A16:
       *datatype = GL_UNSIGNED_SHORT;
       *comps = 1;
       return;
diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
index db63fde3f2d..033d2e1e941 100644
--- a/src/mesa/main/formats.h
+++ b/src/mesa/main/formats.h
@@ -72,6 +72,7 @@ typedef enum
    MESA_FORMAT_AL1616_REV,      /* LLLL LLLL LLLL LLLL AAAA AAAA AAAA AAAA */
    MESA_FORMAT_RGB332,		/*                               RRRG GGBB */
    MESA_FORMAT_A8,		/*                               AAAA AAAA */
+   MESA_FORMAT_A16,             /*                     AAAA AAAA AAAA AAAA */
    MESA_FORMAT_L8,		/*                               LLLL LLLL */
    MESA_FORMAT_I8,		/*                               IIII IIII */
    MESA_FORMAT_CI8,		/*                               CCCC CCCC */
diff --git a/src/mesa/main/texfetch.c b/src/mesa/main/texfetch.c
index 5c7e728c136..6a650d1d143 100644
--- a/src/mesa/main/texfetch.c
+++ b/src/mesa/main/texfetch.c
@@ -286,6 +286,13 @@ texfetch_funcs[MESA_FORMAT_COUNT] =
       store_texel_a8
    },
    {
+      MESA_FORMAT_A16,
+      fetch_texel_1d_f_a16,
+      fetch_texel_2d_f_a16,
+      fetch_texel_3d_f_a16,
+      store_texel_a16
+   },
+   {
       MESA_FORMAT_L8,
       fetch_texel_1d_f_l8,
       fetch_texel_2d_f_l8,
diff --git a/src/mesa/main/texfetch_tmp.h b/src/mesa/main/texfetch_tmp.h
index b6ffdd09f94..3a75cdcefe9 100644
--- a/src/mesa/main/texfetch_tmp.h
+++ b/src/mesa/main/texfetch_tmp.h
@@ -1148,6 +1148,30 @@ static void store_texel_a8(struct gl_texture_image *texImage,
 #endif
 
 
+/* MESA_FORMAT_A16 ************************************************************/
+
+/* Fetch texel from 1D, 2D or 3D a8 texture, return 4 GLchans */
+static void FETCH(f_a16)( const struct gl_texture_image *texImage,
+                          GLint i, GLint j, GLint k, GLfloat *texel )
+{
+   const GLushort *src = TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
+   texel[RCOMP] =
+   texel[GCOMP] =
+   texel[BCOMP] = 0.0F;
+   texel[ACOMP] = USHORT_TO_FLOAT( src[0] );
+}
+
+#if DIM == 3
+static void store_texel_a16(struct gl_texture_image *texImage,
+                            GLint i, GLint j, GLint k, const void *texel)
+{
+   const GLushort *rgba = (const GLushort *) texel;
+   GLushort *dst = TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
+   *dst = rgba[ACOMP];
+}
+#endif
+
+
 /* MESA_FORMAT_L8 ************************************************************/
 
 /* Fetch texel from 1D, 2D or 3D l8 texture, return 4 GLchans */
diff --git a/src/mesa/main/texformat.c b/src/mesa/main/texformat.c
index fb738fc6354..e10d2e535e2 100644
--- a/src/mesa/main/texformat.c
+++ b/src/mesa/main/texformat.c
@@ -102,11 +102,13 @@ _mesa_choose_tex_format( struct gl_context *ctx, GLint internalFormat,
       /* Alpha formats */
       case GL_ALPHA:
       case GL_ALPHA4:
-      case GL_ALPHA12:
-      case GL_ALPHA16:
       case GL_ALPHA8:
          return MESA_FORMAT_A8;
 
+      case GL_ALPHA12:
+      case GL_ALPHA16:
+         return MESA_FORMAT_A16;
+
       /* Luminance formats */
       case 1:
       case GL_LUMINANCE:
diff --git a/src/mesa/main/texgetimage.c b/src/mesa/main/texgetimage.c
index c94f88e16e6..428e41009ad 100644
--- a/src/mesa/main/texgetimage.c
+++ b/src/mesa/main/texgetimage.c
@@ -437,6 +437,11 @@ get_tex_memcpy(struct gl_context *ctx, GLenum format, GLenum type, GLvoid *pixel
                type == GL_UNSIGNED_BYTE) {
          memCopy = GL_TRUE;
       }
+      else if (texImage->TexFormat == MESA_FORMAT_A16 &&
+               format == GL_ALPHA &&
+               type == GL_UNSIGNED_SHORT) {
+         memCopy = GL_TRUE;
+      }
    }
 
    if (memCopy) {
diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
index f9ab9469022..107fbf1951b 100644
--- a/src/mesa/main/texstore.c
+++ b/src/mesa/main/texstore.c
@@ -2357,21 +2357,21 @@ _mesa_texstore_unorm1616(TEXSTORE_PARAMS)
 }
 
 
+/* Texstore for R16, A16. */
 static GLboolean
-_mesa_texstore_r16(TEXSTORE_PARAMS)
+_mesa_texstore_unorm16(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_R16);
+   ASSERT(dstFormat == MESA_FORMAT_R16 ||
+          dstFormat == MESA_FORMAT_A16);
    ASSERT(texelBytes == 2);
 
    if (!ctx->_ImageTransferState &&
        !srcPacking->SwapBytes &&
-       dstFormat == MESA_FORMAT_R16 &&
-       baseInternalFormat == GL_RED &&
-       srcFormat == GL_RED &&
+       baseInternalFormat == srcFormat &&
        srcType == GL_UNSIGNED_SHORT &&
        littleEndian) {
       /* simple memcpy path */
@@ -4048,6 +4048,7 @@ texstore_funcs[MESA_FORMAT_COUNT] =
    { MESA_FORMAT_AL1616_REV, _mesa_texstore_unorm1616 },
    { MESA_FORMAT_RGB332, _mesa_texstore_rgb332 },
    { MESA_FORMAT_A8, _mesa_texstore_a8 },
+   { MESA_FORMAT_A16, _mesa_texstore_unorm16 },
    { MESA_FORMAT_L8, _mesa_texstore_a8 },
    { MESA_FORMAT_I8, _mesa_texstore_a8 },
    { MESA_FORMAT_CI8, _mesa_texstore_ci8 },
@@ -4056,7 +4057,7 @@ texstore_funcs[MESA_FORMAT_COUNT] =
    { MESA_FORMAT_R8, _mesa_texstore_a8 },
    { MESA_FORMAT_RG88, _mesa_texstore_unorm88 },
    { MESA_FORMAT_RG88_REV, _mesa_texstore_unorm88 },
-   { MESA_FORMAT_R16, _mesa_texstore_r16 },
+   { MESA_FORMAT_R16, _mesa_texstore_unorm16 },
    { MESA_FORMAT_RG1616, _mesa_texstore_unorm1616 },
    { MESA_FORMAT_RG1616_REV, _mesa_texstore_unorm1616 },
    { MESA_FORMAT_ARGB2101010, _mesa_texstore_argb2101010 },