asahi: Advertise MRT and fbfetch

These should both work now.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <!20446>

docs/features.txt

@@ -64,7 +64,7 @@ GL 3.0, GLSL 1.30 --- all DONE: freedreno, i965, nv50, nvc0, r600, radeonsi, llv
   Depth format cube textures                            DONE (asahi)
   GLX_ARB_create_context (GLX 1.4 is required)          DONE (v3d, vc4, asahi)
   Multisample anti-aliasing                             DONE (freedreno/a5xx+, freedreno (*), llvmpipe (*), softpipe (*)))
-  8 draw buffers                                        DONE (panfrost/t760+)
+  8 draw buffers                                        DONE (panfrost/t760+, asahi)
 
 (*) freedreno (a2xx-a4xx), llvmpipe, and softpipe have fake Multisample anti-aliasing support
 

src/gallium/drivers/asahi/agx_pipe.c

@@ -1218,7 +1218,9 @@ agx_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
       return 0;
 
    case PIPE_CAP_MAX_RENDER_TARGETS:
-      return 1;
+   case PIPE_CAP_FBFETCH:
+   case PIPE_CAP_FBFETCH_COHERENT:
+      return 8;
 
    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
       return 0;
@@ -1417,7 +1419,7 @@ agx_get_shader_param(struct pipe_screen *pscreen, enum pipe_shader_type shader,
       return 16;
 
    case PIPE_SHADER_CAP_MAX_OUTPUTS:
-      return shader == PIPE_SHADER_FRAGMENT ? 4 : 16;
+      return shader == PIPE_SHADER_FRAGMENT ? 8 : 16;
 
    case PIPE_SHADER_CAP_MAX_TEMPS:
       return 256; /* GL_MAX_PROGRAM_TEMPORARIES_ARB */