freedreno/a6xx: Turn on tessellation shaders

Wow. Very triangle. So shader.

Signed-off-by: Kristian H. Kristensen <hoegsberg@google.com>
Acked-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Rob Clark <robdclark@gmail.com>

diff --git a/src/gallium/drivers/freedreno/freedreno_screen.c b/src/gallium/drivers/freedreno/freedreno_screen.c
index 6b175c8932449961c8de5ae231913bcb9ccbe2fd..6f75f6ed22bdaac3d3575fddb05e2e2f694544b3 100644 (file)
--- a/src/gallium/drivers/freedreno/freedreno_screen.c
+++ b/src/gallium/drivers/freedreno/freedreno_screen.c
@@ -346,6 +346,13 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
        case PIPE_CAP_MAX_VARYINGS:
                return 16;
 
+       case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
+               /* We don't really have a limit on this, it all goes into the main
+                * memory buffer. Needs to be at least 120 / 4 (minimum requirement
+                * for GL_MAX_TESS_PATCH_COMPONENTS).
+                */
+               return 128;
+
        case PIPE_CAP_SHAREABLE_SHADERS:
        case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
        /* manage the variants for these ourself, to avoid breaking precompile: */
@@ -471,6 +478,8 @@ fd_screen_get_shader_param(struct pipe_screen *pscreen,
        case PIPE_SHADER_FRAGMENT:
        case PIPE_SHADER_VERTEX:
                break;
+       case PIPE_SHADER_TESS_CTRL:
+       case PIPE_SHADER_TESS_EVAL:
        case PIPE_SHADER_GEOMETRY:
                if (is_a6xx(screen))
                        break;
@@ -514,8 +523,11 @@ fd_screen_get_shader_param(struct pipe_screen *pscreen,
                 * everything is just normal registers.  This is just temporary
                 * hack until load_input/store_output handle arrays in a similar
                 * way as load_var/store_var..
+                *
+                * For tessellation stages, inputs are loaded using ldlw or ldg, both
+                * of which support indirection.
                 */
-               return 0;
+               return shader == PIPE_SHADER_TESS_CTRL || shader == PIPE_SHADER_TESS_EVAL;
        case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
        case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
                /* a2xx compiler doesn't handle indirect: */