mesa: implement new texture format L16

src/mesa/main/formats.c

@@ -302,6 +302,15 @@ static struct gl_format_info format_info[MESA_FORMAT_COUNT] =
       8, 0, 0, 0, 0,               /* Lum/Int/Index/Depth/StencilBits */
       1, 1, 1                      /* BlockWidth/Height,Bytes */
    },
+   {
+      MESA_FORMAT_L16,             /* Name */
+      "MESA_FORMAT_L16",           /* StrName */
+      GL_LUMINANCE,                /* BaseFormat */
+      GL_UNSIGNED_NORMALIZED,      /* DataType */
+      0, 0, 0, 0,                  /* Red/Green/Blue/AlphaBits */
+      16, 0, 0, 0, 0,              /* Lum/Int/Index/Depth/StencilBits */
+      1, 1, 2                      /* BlockWidth/Height,Bytes */
+   },
    {
       MESA_FORMAT_I8,              /* Name */
       "MESA_FORMAT_I8",            /* StrName */
@@ -1307,6 +1316,7 @@ _mesa_format_to_type_and_comps(gl_format format,
 
    case MESA_FORMAT_R16:
    case MESA_FORMAT_A16:
+   case MESA_FORMAT_L16:
       *datatype = GL_UNSIGNED_SHORT;
       *comps = 1;
       return;

src/mesa/main/formats.h

@@ -74,6 +74,7 @@ typedef enum
    MESA_FORMAT_A8,		/*                               AAAA AAAA */
    MESA_FORMAT_A16,             /*                     AAAA AAAA AAAA AAAA */
    MESA_FORMAT_L8,		/*                               LLLL LLLL */
+   MESA_FORMAT_L16,             /*                     LLLL LLLL LLLL LLLL */
    MESA_FORMAT_I8,		/*                               IIII IIII */
    MESA_FORMAT_CI8,		/*                               CCCC CCCC */
    MESA_FORMAT_YCBCR,		/*                     YYYY YYYY UorV UorV */

src/mesa/main/texfetch.c

@@ -299,6 +299,13 @@ texfetch_funcs[MESA_FORMAT_COUNT] =
       fetch_texel_3d_f_l8,
       store_texel_l8
    },
+   {
+      MESA_FORMAT_L16,
+      fetch_texel_1d_f_l16,
+      fetch_texel_2d_f_l16,
+      fetch_texel_3d_f_l16,
+      store_texel_l16
+   },
    {
       MESA_FORMAT_I8,
       fetch_texel_1d_f_i8,

src/mesa/main/texfetch_tmp.h

@@ -1196,6 +1196,30 @@ static void store_texel_l8(struct gl_texture_image *texImage,
 #endif
 
 
+/* MESA_FORMAT_L16 ***********************************************************/
+
+/* Fetch texel from 1D, 2D or 3D l16 texture, return 4 GLchans */
+static void FETCH(f_l16)( 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] = USHORT_TO_FLOAT( src[0] );
+   texel[ACOMP] = 1.0F;
+}
+
+#if DIM == 3
+static void store_texel_l16(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[RCOMP];
+}
+#endif
+
+
 /* MESA_FORMAT_I8 ************************************************************/
 
 /* Fetch texel from 1D, 2D or 3D i8 texture, return 4 GLchans */

src/mesa/main/texformat.c

@@ -113,11 +113,13 @@ _mesa_choose_tex_format( struct gl_context *ctx, GLint internalFormat,
       case 1:
       case GL_LUMINANCE:
       case GL_LUMINANCE4:
-      case GL_LUMINANCE12:
-      case GL_LUMINANCE16:
       case GL_LUMINANCE8:
          return MESA_FORMAT_L8;
 
+      case GL_LUMINANCE12:
+      case GL_LUMINANCE16:
+         return MESA_FORMAT_L16;
+
       /* Luminance/Alpha formats */
       case GL_LUMINANCE4_ALPHA4:
          return MESA_FORMAT_AL44;

src/mesa/main/texgetimage.c

@@ -432,6 +432,11 @@ 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_L16 &&
+               format == GL_LUMINANCE &&
+               type == GL_UNSIGNED_SHORT) {
+         memCopy = GL_TRUE;
+      }
       else if (texImage->TexFormat == MESA_FORMAT_A8 &&
                format == GL_ALPHA &&
                type == GL_UNSIGNED_BYTE) {

src/mesa/main/texstore.c

@@ -2357,7 +2357,7 @@ _mesa_texstore_unorm1616(TEXSTORE_PARAMS)
 }
 
 
-/* Texstore for R16, A16. */
+/* Texstore for R16, A16, L16. */
 static GLboolean
 _mesa_texstore_unorm16(TEXSTORE_PARAMS)
 {
@@ -2366,7 +2366,8 @@ _mesa_texstore_unorm16(TEXSTORE_PARAMS)
    const GLenum baseFormat = _mesa_get_format_base_format(dstFormat);
 
    ASSERT(dstFormat == MESA_FORMAT_R16 ||
-          dstFormat == MESA_FORMAT_A16);
+          dstFormat == MESA_FORMAT_A16 ||
+          dstFormat == MESA_FORMAT_L16);
    ASSERT(texelBytes == 2);
 
    if (!ctx->_ImageTransferState &&
@@ -4050,6 +4051,7 @@ texstore_funcs[MESA_FORMAT_COUNT] =
    { MESA_FORMAT_A8, _mesa_texstore_a8 },
    { MESA_FORMAT_A16, _mesa_texstore_unorm16 },
    { MESA_FORMAT_L8, _mesa_texstore_a8 },
+   { MESA_FORMAT_L16, _mesa_texstore_unorm16 },
    { MESA_FORMAT_I8, _mesa_texstore_a8 },
    { MESA_FORMAT_CI8, _mesa_texstore_ci8 },
    { MESA_FORMAT_YCBCR, _mesa_texstore_ycbcr },