freedreno: Drop custom driver lowering of GL's color clamping.

The mesa/st frontend can do it for us now that we don't need to worry
about breaking precompiles.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8997>

src/freedreno/ir3/ir3_nir.c

@@ -469,16 +469,12 @@ ir3_nir_lower_variant(struct ir3_shader_variant *so, nir_shader *s)
 	if (s->info.stage == MESA_SHADER_VERTEX) {
 		if (so->key.ucp_enables)
 			progress |= OPT(s, nir_lower_clip_vs, so->key.ucp_enables, false, false, NULL);
-		if (so->key.vclamp_color)
-			progress |= OPT(s, nir_lower_clamp_color_outputs);
 	} else if (s->info.stage == MESA_SHADER_FRAGMENT) {
 		bool layer_zero = so->key.layer_zero && (s->info.inputs_read & VARYING_BIT_LAYER);
 		bool view_zero = so->key.view_zero && (s->info.inputs_read & VARYING_BIT_VIEWPORT);
 
 		if (so->key.ucp_enables && !so->shader->compiler->has_clip_cull)
 			progress |= OPT(s, nir_lower_clip_fs, so->key.ucp_enables, false);
-		if (so->key.fclamp_color)
-			progress |= OPT(s, nir_lower_clamp_color_outputs);
 		if (layer_zero || view_zero)
 			progress |= OPT(s, ir3_nir_lower_view_layer_id, layer_zero, view_zero);
 	}

src/freedreno/ir3/ir3_shader.c

@@ -446,12 +446,6 @@ ir3_setup_used_key(struct ir3_shader *shader)
 			key->view_zero = true;
 		}
 
-		if ((info->outputs_written & ~(FRAG_RESULT_DEPTH |
-								FRAG_RESULT_STENCIL |
-								FRAG_RESULT_SAMPLE_MASK)) != 0) {
-			key->fclamp_color = true;
-		}
-
 		/* Only used for deciding on behavior of
 		 * nir_intrinsic_load_barycentric_sample
 		 */
@@ -460,9 +454,6 @@ ir3_setup_used_key(struct ir3_shader *shader)
 		key->tessellation = ~0;
 		key->has_gs = true;
 
-		if (info->outputs_written & VARYING_BITS_COLOR)
-			key->vclamp_color = true;
-
 		if (info->stage == MESA_SHADER_VERTEX) {
 			key->vsaturate_s = ~0;
 			key->vsaturate_t = ~0;

src/freedreno/ir3/ir3_shader.h

@@ -287,11 +287,6 @@ struct ir3_shader_key {
 			/* do we need to check {v,f}saturate_{s,t,r}? */
 			unsigned has_per_samp : 1;
 
-			/*
-			 * Vertex shader variant parameters:
-			 */
-			unsigned vclamp_color : 1;
-
 			/*
 			 * Fragment shader variant parameters:
 			 */
@@ -301,7 +296,6 @@ struct ir3_shader_key {
 			 * for front/back color inputs to frag shader:
 			 */
 			unsigned rasterflat : 1;
-			unsigned fclamp_color : 1;
 
 			/* Indicates that this is a tessellation pipeline which requires a
 			 * whole different kind of vertex shader.  In case of
@@ -385,9 +379,6 @@ ir3_shader_key_changes_fs(struct ir3_shader_key *key, struct ir3_shader_key *las
 			return true;
 	}
 
-	if (last_key->fclamp_color != key->fclamp_color)
-		return true;
-
 	if (last_key->rasterflat != key->rasterflat)
 		return true;
 
@@ -416,9 +407,6 @@ ir3_shader_key_changes_vs(struct ir3_shader_key *key, struct ir3_shader_key *las
 			return true;
 	}
 
-	if (last_key->vclamp_color != key->vclamp_color)
-		return true;
-
 	if (last_key->ucp_enables != key->ucp_enables)
 		return true;
 

src/gallium/drivers/freedreno/a3xx/fd3_draw.c

@@ -130,8 +130,6 @@ fd3_draw_vbo(struct fd_context *ctx, const struct pipe_draw_info *info,
 		.indirect = indirect,
 		.draw = draw,
 		.key = {
-			.vclamp_color = ctx->rasterizer->clamp_vertex_color,
-			.fclamp_color = ctx->rasterizer->clamp_fragment_color,
 			.has_per_samp = (fd3_ctx->fsaturate || fd3_ctx->vsaturate),
 			.vsaturate_s = fd3_ctx->vsaturate_s,
 			.vsaturate_t = fd3_ctx->vsaturate_t,

src/gallium/drivers/freedreno/a4xx/fd4_draw.c

@@ -114,8 +114,6 @@ fd4_draw_vbo(struct fd_context *ctx, const struct pipe_draw_info *info,
 		.indirect = indirect,
 		.draw = draw,
 		.key = {
-			.vclamp_color = ctx->rasterizer->clamp_vertex_color,
-			.fclamp_color = ctx->rasterizer->clamp_fragment_color,
 			.rasterflat = ctx->rasterizer->flatshade,
 			.ucp_enables = ctx->rasterizer->clip_plane_enable,
 			.has_per_samp = (fd4_ctx->fsaturate || fd4_ctx->vsaturate ||

src/gallium/drivers/freedreno/a5xx/fd5_draw.c

@@ -109,8 +109,6 @@ fd5_draw_vbo(struct fd_context *ctx, const struct pipe_draw_info *info,
 		.indirect = indirect,
 		.draw = draw,
 		.key = {
-			.vclamp_color = ctx->rasterizer->clamp_vertex_color,
-			.fclamp_color = ctx->rasterizer->clamp_fragment_color,
 			.rasterflat = ctx->rasterizer->flatshade,
 			.ucp_enables = ctx->rasterizer->clip_plane_enable,
 			.has_per_samp = (fd5_ctx->fsaturate || fd5_ctx->vsaturate ||

src/gallium/drivers/freedreno/a6xx/fd6_draw.c

@@ -186,8 +186,6 @@ fd6_draw_vbo(struct fd_context *ctx, const struct pipe_draw_info *info,
 			.gs = ctx->prog.gs,
 			.fs = ctx->prog.fs,
 			.key = {
-				.vclamp_color = ctx->rasterizer->clamp_vertex_color,
-				.fclamp_color = ctx->rasterizer->clamp_fragment_color,
 				.rasterflat = ctx->rasterizer->flatshade,
 				.ucp_enables = ctx->rasterizer->clip_plane_enable,
 				.has_per_samp = (fd6_ctx->fsaturate || fd6_ctx->vsaturate),

src/gallium/drivers/freedreno/freedreno_screen.c

@@ -386,9 +386,6 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 
 	case PIPE_CAP_SHAREABLE_SHADERS:
 	case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
-	/* manage the variants for these ourself, to avoid breaking precompile: */
-	case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
-	case PIPE_CAP_VERTEX_COLOR_CLAMPED:
 		if (is_ir3(screen))
 			return 1;
 		return 0;