i965: add support for ARB_half_float_vertex

enables the extension on i965 and adds support to the draw upload for
the vertex format.

Signed-off-by: Dave Airlie <airlied@redhat.com>

src/mesa/drivers/dri/i965/brw_draw_upload.c

@@ -59,6 +59,14 @@ static GLuint float_types[5] = {
    BRW_SURFACEFORMAT_R32G32B32A32_FLOAT
 };
 
+static GLuint half_float_types[5] = {
+   0,
+   BRW_SURFACEFORMAT_R16_FLOAT,
+   BRW_SURFACEFORMAT_R16G16_FLOAT,
+   0, /* can't seem to render this one */
+   BRW_SURFACEFORMAT_R16G16B16A16_FLOAT
+};
+
 static GLuint uint_types_norm[5] = {
    0,
    BRW_SURFACEFORMAT_R32_UNORM,
@@ -172,6 +180,7 @@ static GLuint get_surface_type( GLenum type, GLuint size,
       switch (type) {
       case GL_DOUBLE: return double_types[size];
       case GL_FLOAT: return float_types[size];
+      case GL_HALF_FLOAT: return half_float_types[size];
       case GL_INT: return int_types_norm[size];
       case GL_SHORT: return short_types_norm[size];
       case GL_BYTE: return byte_types_norm[size];
@@ -194,6 +203,7 @@ static GLuint get_surface_type( GLenum type, GLuint size,
       switch (type) {
       case GL_DOUBLE: return double_types[size];
       case GL_FLOAT: return float_types[size];
+      case GL_HALF_FLOAT: return half_float_types[size];
       case GL_INT: return int_types_scale[size];
       case GL_SHORT: return short_types_scale[size];
       case GL_BYTE: return byte_types_scale[size];
@@ -211,6 +221,7 @@ static GLuint get_size( GLenum type )
    switch (type) {
    case GL_DOUBLE: return sizeof(GLdouble);
    case GL_FLOAT: return sizeof(GLfloat);
+   case GL_HALF_FLOAT: return sizeof(GLhalfARB);
    case GL_INT: return sizeof(GLint);
    case GL_SHORT: return sizeof(GLshort);
    case GL_BYTE: return sizeof(GLbyte);

src/mesa/drivers/dri/intel/intel_extensions.c

@@ -154,6 +154,7 @@ static const struct dri_extension brw_extensions[] = {
    { "GL_ARB_fragment_program_shadow",    NULL },
    { "GL_ARB_fragment_shader",            NULL },
    { "GL_ARB_framebuffer_object",         GL_ARB_framebuffer_object_functions},
+   { "GL_ARB_half_float_vertex",          NULL },
    { "GL_ARB_occlusion_query",            GL_ARB_occlusion_query_functions },
    { "GL_ARB_point_sprite", 		  NULL },
    { "GL_ARB_seamless_cube_map",          NULL },