mesa: finish up ARB_texture_float

Squashed commit of the following:

Author: Marek Olšák <maraeo@gmail.com>

    mesa: handle floating-point formats in _mesa_base_fbo_format
    mesa: add ARB/ATI_texture_float, remove MESAX_texture_float

commit 123bb11085
Author: Luca Barbieri <luca@luca-barbieri.com>
Date:   Wed Aug 25 01:35:42 2010 +0200

    mesa: compute floatMode for FBOs and return it on RGBA_FLOAT_MODE

src/mesa/drivers/dri/r300/r300_context.c

@@ -133,7 +133,6 @@ static const struct dri_extension card_extensions[] = {
   {"GL_ATI_texture_mirror_once",	NULL},
   {"GL_MESA_pack_invert",		NULL},
   {"GL_MESA_ycbcr_texture",		NULL},
-  {"GL_MESAX_texture_float",		NULL},
   {"GL_NV_blend_square",		NULL},
   {"GL_NV_vertex_program",		GL_NV_vertex_program_functions},
 #if FEATURE_OES_EGL_image

src/mesa/drivers/dri/r600/r600_context.c

@@ -145,7 +145,6 @@ static const struct dri_extension card_extensions[] = {
   {"GL_ATI_texture_mirror_once",	NULL},
   {"GL_MESA_pack_invert",		NULL},
   {"GL_MESA_ycbcr_texture",		NULL},
-  {"GL_MESAX_texture_float",		NULL},
   {"GL_NV_blend_square",		NULL},
   {"GL_NV_vertex_program",		GL_NV_vertex_program_functions},
   {"GL_ARB_pixel_buffer_object",        NULL},

src/mesa/main/extensions.c

@@ -124,6 +124,7 @@ static const struct extension extension_table[] = {
    { "GL_ARB_texture_env_combine",                 o(ARB_texture_env_combine),                 GL,             2001 },
    { "GL_ARB_texture_env_crossbar",                o(ARB_texture_env_crossbar),                GL,             2001 },
    { "GL_ARB_texture_env_dot3",                    o(ARB_texture_env_dot3),                    GL,             2001 },
+   { "GL_ARB_texture_float",                       o(ARB_texture_float),                       GL,             2004 },
    { "GL_ARB_texture_mirrored_repeat",             o(ARB_texture_mirrored_repeat),             GL,             2001 },
    { "GL_ARB_texture_multisample",                 o(ARB_texture_multisample),                 GL,             2009 },
    { "GL_ARB_texture_non_power_of_two",            o(ARB_texture_non_power_of_two),            GL,             2003 },
@@ -268,6 +269,7 @@ static const struct extension extension_table[] = {
    { "GL_ATI_separate_stencil",                    o(ATI_separate_stencil),                    GL,             2006 },
    { "GL_ATI_texture_compression_3dc",             o(ATI_texture_compression_3dc),             GL,             2004 },
    { "GL_ATI_texture_env_combine3",                o(ATI_texture_env_combine3),                GL,             2002 },
+   { "GL_ATI_texture_float",                       o(ARB_texture_float),                       GL,             2002 },
    { "GL_ATI_texture_mirror_once",                 o(ATI_texture_mirror_once),                 GL,             2006 },
    { "GL_IBM_multimode_draw_arrays",               o(IBM_multimode_draw_arrays),               GL,             1998 },
    { "GL_IBM_rasterpos_clip",                      o(IBM_rasterpos_clip),                      GL,             1996 },
@@ -278,7 +280,6 @@ static const struct extension extension_table[] = {
    { "GL_MESA_texture_array",                      o(MESA_texture_array),                      GL,             2007 },
    { "GL_MESA_texture_signed_rgba",                o(EXT_texture_snorm),                       GL,             2009 },
    { "GL_MESA_window_pos",                         o(ARB_window_pos),                          GL,             2000 },
-   { "GL_MESAX_texture_float",                     o(ARB_texture_float),                       GL,             2009 },
    { "GL_MESA_ycbcr_texture",                      o(MESA_ycbcr_texture),                      GL,             2002 },
    { "GL_NV_blend_square",                         o(NV_blend_square),                         GL,             1999 },
    { "GL_NV_conditional_render",                   o(NV_conditional_render),                   GL,             2008 },

src/mesa/main/fbobject.c

@@ -1145,7 +1145,37 @@ _mesa_base_fbo_format(struct gl_context *ctx, GLenum internalFormat)
    case GL_INTENSITY16_SNORM:
       return ctx->Extensions.EXT_texture_snorm &&
              ctx->Extensions.ARB_framebuffer_object ? GL_INTENSITY : 0;
-   /* XXX add floating point and integer formats eventually */
+   case GL_R16F:
+   case GL_R32F:
+      return ctx->Extensions.ARB_texture_rg &&
+             ctx->Extensions.ARB_texture_float ? GL_RED : 0;
+   case GL_RG16F:
+   case GL_RG32F:
+      return ctx->Extensions.ARB_texture_rg &&
+             ctx->Extensions.ARB_texture_float ? GL_RG : 0;
+   case GL_RGB16F:
+   case GL_RGB32F:
+      return ctx->Extensions.ARB_texture_float ? GL_RGB : 0;
+   case GL_RGBA16F:
+   case GL_RGBA32F:
+      return ctx->Extensions.ARB_texture_float ? GL_RGBA : 0;
+   case GL_ALPHA16F_ARB:
+   case GL_ALPHA32F_ARB:
+      return ctx->Extensions.ARB_texture_float &&
+             ctx->Extensions.ARB_framebuffer_object ? GL_ALPHA : 0;
+   case GL_LUMINANCE16F_ARB:
+   case GL_LUMINANCE32F_ARB:
+      return ctx->Extensions.ARB_texture_float &&
+             ctx->Extensions.ARB_framebuffer_object ? GL_LUMINANCE : 0;
+   case GL_LUMINANCE_ALPHA16F_ARB:
+   case GL_LUMINANCE_ALPHA32F_ARB:
+      return ctx->Extensions.ARB_texture_float &&
+             ctx->Extensions.ARB_framebuffer_object ? GL_LUMINANCE_ALPHA : 0;
+   case GL_INTENSITY16F_ARB:
+   case GL_INTENSITY32F_ARB:
+      return ctx->Extensions.ARB_texture_float &&
+             ctx->Extensions.ARB_framebuffer_object ? GL_INTENSITY : 0;
+   /* XXX add integer formats eventually */
    default:
       return 0;
    }

src/mesa/main/framebuffer.c

@@ -551,7 +551,6 @@ _mesa_update_framebuffer_visual(struct gl_context *ctx,
             fb->Visual.alphaBits = _mesa_get_format_bits(fmt, GL_ALPHA_BITS);
             fb->Visual.rgbBits = fb->Visual.redBits
                + fb->Visual.greenBits + fb->Visual.blueBits;
-            fb->Visual.floatMode = GL_FALSE;
             fb->Visual.samples = rb->NumSamples;
             if (_mesa_get_format_color_encoding(fmt) == GL_SRGB)
                 fb->Visual.sRGBCapable = ctx->Const.sRGBCapable;
@@ -560,6 +559,19 @@ _mesa_update_framebuffer_visual(struct gl_context *ctx,
       }
    }
 
+   fb->Visual.floatMode = GL_FALSE;
+   for (i = 0; i < BUFFER_COUNT; i++) {
+      if (fb->Attachment[i].Renderbuffer) {
+         const struct gl_renderbuffer *rb = fb->Attachment[i].Renderbuffer;
+         const gl_format fmt = rb->Format;
+
+         if (_mesa_get_format_datatype(fmt) == GL_FLOAT) {
+            fb->Visual.floatMode = GL_TRUE;
+            break;
+         }
+      }
+   }
+
    if (fb->Attachment[BUFFER_DEPTH].Renderbuffer) {
       const struct gl_renderbuffer *rb =
          fb->Attachment[BUFFER_DEPTH].Renderbuffer;