llvmpipe: add ARB_derivative_control support

Reviewed-by: Roland Scheidegger <sroland@vmware.com>

.gitlab-ci/piglit/glslparser.txt

@@ -350,16 +350,20 @@ spec/arb_conservative_depth/preprocessor/disabled-undefined-core.tese: skip
 spec/arb_conservative_depth/preprocessor/disabled-undefined-core.vert: skip
 spec/arb_conservative_depth/preprocessor/enabled-core.tesc: skip
 spec/arb_conservative_depth/preprocessor/enabled-core.tese: skip
+spec/arb_derivative_control/preprocessor/disabled-defined-core.comp: skip
+spec/arb_derivative_control/preprocessor/disabled-defined-core.frag: skip
+spec/arb_derivative_control/preprocessor/disabled-defined-core.geom: skip
 spec/arb_derivative_control/preprocessor/disabled-defined-core.tesc: skip
 spec/arb_derivative_control/preprocessor/disabled-defined-core.tese: skip
+spec/arb_derivative_control/preprocessor/disabled-defined-core.vert: skip
+spec/arb_derivative_control/preprocessor/disabled-undefined-core.comp: skip
+spec/arb_derivative_control/preprocessor/disabled-undefined-core.frag: skip
+spec/arb_derivative_control/preprocessor/disabled-undefined-core.geom: skip
 spec/arb_derivative_control/preprocessor/disabled-undefined-core.tesc: skip
 spec/arb_derivative_control/preprocessor/disabled-undefined-core.tese: skip
-spec/arb_derivative_control/preprocessor/enabled-core.comp: skip
+spec/arb_derivative_control/preprocessor/disabled-undefined-core.vert: skip
-spec/arb_derivative_control/preprocessor/enabled-core.frag: skip
-spec/arb_derivative_control/preprocessor/enabled-core.geom: skip
 spec/arb_derivative_control/preprocessor/enabled-core.tesc: skip
 spec/arb_derivative_control/preprocessor/enabled-core.tese: skip
-spec/arb_derivative_control/preprocessor/enabled-core.vert: skip
 spec/arb_draw_buffers/preprocessor/disabled-defined-compat.frag: skip
 spec/arb_draw_buffers/preprocessor/disabled-defined-compat.vert: skip
 spec/arb_draw_buffers/preprocessor/disabled-defined-core.comp: skip
@@ -5098,10 +5102,10 @@ spec/oes_texture_storage_multisample_2d_array/preprocessor/enabled-es.tese: skip
 summary:
        name:  results
        ----  --------
-       pass:     9686
+       pass:     9682
        fail:        2
       crash:        0
-       skip:     5095
+       skip:     5099
     timeout:        0
        warn:        0
  incomplete:        0

.gitlab-ci/piglit/quick_shader.txt

@@ -124,11 +124,6 @@ spec/arb_compute_variable_group_size/execution/separate-global-id-2: skip
 spec/arb_compute_variable_group_size/linker/mixed_fixed_variable_local_work_size: skip
 spec/arb_compute_variable_group_size/linker/no_local_size_specified: skip
 spec/arb_cull_distance/clip-cull-4: fail
-spec/arb_derivative_control/execution/dfdx-coarse: skip
-spec/arb_derivative_control/execution/dfdx-dfdy: skip
-spec/arb_derivative_control/execution/dfdx-fine: skip
-spec/arb_derivative_control/execution/dfdy-coarse: skip
-spec/arb_derivative_control/execution/dfdy-fine: skip
 spec/arb_enhanced_layouts/execution/component-layout/vs-tcs-load-output: skip
 spec/arb_enhanced_layouts/execution/component-layout/vs-tcs-load-output-indirect: skip
 spec/arb_enhanced_layouts/execution/component-layout/vs-tcs-tes-fs: skip
@@ -6408,10 +6403,10 @@ spec/oes_viewport_array/viewport-gs-writes-out-of-range: skip
 summary:
        name:  results
        ----  --------
-       pass:     8939
+       pass:     8944
        fail:       55
       crash:        0
-       skip:     6352
+       skip:     6347
     timeout:        0
        warn:        0
  incomplete:        0

docs/features.txt

@@ -215,7 +215,7 @@ GL 4.5, GLSL 4.50 -- all DONE: nvc0, radeonsi, r600
   GL_ARB_clip_control                                   DONE (freedreno, i965, nv50, llvmpipe, softpipe, swr)
   GL_ARB_conditional_render_inverted                    DONE (freedreno, i965, nv50, llvmpipe, softpipe, swr, virgl)
   GL_ARB_cull_distance                                  DONE (i965, nv50, llvmpipe, softpipe, swr, virgl)
-  GL_ARB_derivative_control                             DONE (i965, nv50, softpipe, virgl)
+  GL_ARB_derivative_control                             DONE (i965, nv50, llvmpipe, softpipe, virgl)
   GL_ARB_direct_state_access                            DONE (all drivers)
   GL_ARB_get_texture_sub_image                          DONE (all drivers)
   GL_ARB_shader_texture_image_samples                   DONE (i965, nv50, virgl)

src/gallium/auxiliary/gallivm/lp_bld_nir.c

@@ -474,9 +474,13 @@ static LLVMValueRef do_alu_action(struct lp_build_nir_context *bld_base,
       result = lp_build_cos(&bld_base->base, src[0]);
       break;
    case nir_op_fddx:
+   case nir_op_fddx_coarse:
+   case nir_op_fddx_fine:
       result = lp_build_ddx(&bld_base->base, src[0]);
       break;
    case nir_op_fddy:
+   case nir_op_fddy_coarse:
+   case nir_op_fddy_fine:
       result = lp_build_ddy(&bld_base->base, src[0]);
       break;
    case nir_op_fdiv:

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -266,7 +266,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
       return 1;
    case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
-      return 0;
+      return 1;
    case PIPE_CAP_TGSI_TEX_TXF_LZ:
    case PIPE_CAP_SAMPLER_VIEW_TARGET:
       return 1;