Mesa (master): mesa: implement new texture format I16

[Marek Olšák]

Module: Mesa
Branch: master
Commit: fd8aa7ac71699facf9839e2ae56b5e37579c6bcc
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=fd8aa7ac71699facf9839e2ae56b5e37579c6bcc

Author: Marek Olšák <maraeo at gmail.com>
Date:   Wed Dec 22 01:12:20 2010 +0100

mesa: implement new texture format I16

---

 src/mesa/main/formats.c      |   10 ++++++++++
 src/mesa/main/formats.h      |    1 +
 src/mesa/main/texfetch.c     |    7 +++++++
 src/mesa/main/texfetch_tmp.h |   24 ++++++++++++++++++++++++
 src/mesa/main/texformat.c    |    6 ++++--
 src/mesa/main/texstore.c     |    6 ++++--
 6 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index 81d907f..08efde5 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -321,6 +321,15 @@ static struct gl_format_info format_info[MESA_FORMAT_COUNT] =
       1, 1, 1                      /* BlockWidth/Height,Bytes */
    },
    {
+      MESA_FORMAT_I16,             /* Name */
+      "MESA_FORMAT_I16",           /* StrName */
+      GL_INTENSITY,                /* BaseFormat */
+      GL_UNSIGNED_NORMALIZED,      /* DataType */
+      0, 0, 0, 0,                  /* Red/Green/Blue/AlphaBits */
+      0, 16, 0, 0, 0,              /* Lum/Int/Index/Depth/StencilBits */
+      1, 1, 2                      /* BlockWidth/Height,Bytes */
+   },
+   {
       MESA_FORMAT_CI8,             /* Name */
       "MESA_FORMAT_CI8",           /* StrName */
       GL_COLOR_INDEX,              /* BaseFormat */
@@ -1317,6 +1326,7 @@ _mesa_format_to_type_and_comps(gl_format format,
    case MESA_FORMAT_R16:
    case MESA_FORMAT_A16:
    case MESA_FORMAT_L16:
+   case MESA_FORMAT_I16:
       *datatype = GL_UNSIGNED_SHORT;
       *comps = 1;
       return;
diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
index afc91e3..b8e7666 100644
--- a/src/mesa/main/formats.h
+++ b/src/mesa/main/formats.h
@@ -76,6 +76,7 @@ typedef enum
    MESA_FORMAT_L8,		/*                               LLLL LLLL */
    MESA_FORMAT_L16,             /*                     LLLL LLLL LLLL LLLL */
    MESA_FORMAT_I8,		/*                               IIII IIII */
+   MESA_FORMAT_I16,             /*                     IIII IIII IIII IIII */
    MESA_FORMAT_CI8,		/*                               CCCC CCCC */
    MESA_FORMAT_YCBCR,		/*                     YYYY YYYY UorV UorV */
    MESA_FORMAT_YCBCR_REV,	/*                     UorV UorV YYYY YYYY */
diff --git a/src/mesa/main/texfetch.c b/src/mesa/main/texfetch.c
index 4791e36..77bbc91 100644
--- a/src/mesa/main/texfetch.c
+++ b/src/mesa/main/texfetch.c
@@ -314,6 +314,13 @@ texfetch_funcs[MESA_FORMAT_COUNT] =
       store_texel_i8
    },
    {
+      MESA_FORMAT_I16,
+      fetch_texel_1d_f_i16,
+      fetch_texel_2d_f_i16,
+      fetch_texel_3d_f_i16,
+      store_texel_i16
+   },
+   {
       MESA_FORMAT_CI8,
       fetch_texel_1d_f_ci8,
       fetch_texel_2d_f_ci8,
diff --git a/src/mesa/main/texfetch_tmp.h b/src/mesa/main/texfetch_tmp.h
index 0951f86..0b69b69 100644
--- a/src/mesa/main/texfetch_tmp.h
+++ b/src/mesa/main/texfetch_tmp.h
@@ -1244,6 +1244,30 @@ static void store_texel_i8(struct gl_texture_image *texImage,
 #endif
 
 
+/* MESA_FORMAT_I16 ***********************************************************/
+
+/* Fetch texel from 1D, 2D or 3D i16 texture, return 4 GLchans */
+static void FETCH(f_i16)( 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] =
+   texel[ACOMP] = USHORT_TO_FLOAT( src[0] );
+}
+
+#if DIM == 3
+static void store_texel_i16(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_CI8 ***********************************************************/
 
 /* Fetch CI texel from 1D, 2D or 3D ci8 texture, lookup the index in a
diff --git a/src/mesa/main/texformat.c b/src/mesa/main/texformat.c
index c701143..8242717 100644
--- a/src/mesa/main/texformat.c
+++ b/src/mesa/main/texformat.c
@@ -137,11 +137,13 @@ _mesa_choose_tex_format( struct gl_context *ctx, GLint internalFormat,
 
       case GL_INTENSITY:
       case GL_INTENSITY4:
-      case GL_INTENSITY12:
-      case GL_INTENSITY16:
       case GL_INTENSITY8:
          return MESA_FORMAT_I8;
 
+      case GL_INTENSITY12:
+      case GL_INTENSITY16:
+         return MESA_FORMAT_I16;
+
       case GL_COLOR_INDEX:
       case GL_COLOR_INDEX1_EXT:
       case GL_COLOR_INDEX2_EXT:
diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
index e43636e..acb390b 100644
--- a/src/mesa/main/texstore.c
+++ b/src/mesa/main/texstore.c
@@ -2357,7 +2357,7 @@ _mesa_texstore_unorm1616(TEXSTORE_PARAMS)
 }
 
 
-/* Texstore for R16, A16, L16. */
+/* Texstore for R16, A16, L16, I16. */
 static GLboolean
 _mesa_texstore_unorm16(TEXSTORE_PARAMS)
 {
@@ -2367,7 +2367,8 @@ _mesa_texstore_unorm16(TEXSTORE_PARAMS)
 
    ASSERT(dstFormat == MESA_FORMAT_R16 ||
           dstFormat == MESA_FORMAT_A16 ||
-          dstFormat == MESA_FORMAT_L16);
+          dstFormat == MESA_FORMAT_L16 ||
+          dstFormat == MESA_FORMAT_I16);
    ASSERT(texelBytes == 2);
 
    if (!ctx->_ImageTransferState &&
@@ -4053,6 +4054,7 @@ texstore_funcs[MESA_FORMAT_COUNT] =
    { MESA_FORMAT_L8, _mesa_texstore_a8 },
    { MESA_FORMAT_L16, _mesa_texstore_unorm16 },
    { MESA_FORMAT_I8, _mesa_texstore_a8 },
+   { MESA_FORMAT_I16, _mesa_texstore_unorm16 },
    { MESA_FORMAT_CI8, _mesa_texstore_ci8 },
    { MESA_FORMAT_YCBCR, _mesa_texstore_ycbcr },
    { MESA_FORMAT_YCBCR_REV, _mesa_texstore_ycbcr },