Mesa (main): mesa/st: add nir shader to clear color buffers using constant value
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Thu May 19 11:47:42 UTC 2022
Module: Mesa
Branch: main
Commit: 2204bf509d6d85ac47d029809bb004a03fd12a9a
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=2204bf509d6d85ac47d029809bb004a03fd12a9a
Author: Indrajit Kumar Das <indrajit-kumar.das at amd.com>
Date: Fri May 13 17:21:20 2022 +0530
mesa/st: add nir shader to clear color buffers using constant value
v2: use load_uniform instead of load_ubo to fix vc4
Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15318>
---
src/mesa/state_tracker/st_nir.h | 4 ++++
src/mesa/state_tracker/st_nir_builtins.c | 32 ++++++++++++++++++++++++++++++++
2 files changed, 36 insertions(+)
diff --git a/src/mesa/state_tracker/st_nir.h b/src/mesa/state_tracker/st_nir.h
index 58003d82b60..28fa476589b 100644
--- a/src/mesa/state_tracker/st_nir.h
+++ b/src/mesa/state_tracker/st_nir.h
@@ -74,6 +74,10 @@ st_nir_make_passthrough_shader(struct st_context *st,
unsigned sysval_mask);
void
st_nir_add_point_size(struct nir_shader *nir);
+
+struct pipe_shader_state *
+st_nir_make_clearcolor_shader(struct st_context *st);
+
#ifdef __cplusplus
}
#endif
diff --git a/src/mesa/state_tracker/st_nir_builtins.c b/src/mesa/state_tracker/st_nir_builtins.c
index 06959dcd078..bfbe0a939b8 100644
--- a/src/mesa/state_tracker/st_nir_builtins.c
+++ b/src/mesa/state_tracker/st_nir_builtins.c
@@ -131,3 +131,35 @@ st_nir_make_passthrough_shader(struct st_context *st,
return st_nir_finish_builtin_shader(st, b.shader);
}
+
+/**
+ * Make a simple shader that reads color value from a constant buffer
+ * and uses it to clear all color buffers.
+ */
+struct pipe_shader_state *
+st_nir_make_clearcolor_shader(struct st_context *st)
+{
+ const nir_shader_compiler_options *options =
+ st_get_nir_compiler_options(st, MESA_SHADER_FRAGMENT);
+
+ nir_builder b = nir_builder_init_simple_shader(MESA_SHADER_FRAGMENT, options,
+ "clear color FS");
+ b.shader->info.num_ubos = 1;
+ b.shader->num_outputs = 1;
+ b.shader->num_uniforms = 1;
+
+ /* Read clear color from constant buffer */
+ nir_ssa_def *clear_color = nir_load_uniform(&b, 4, 32, nir_imm_int(&b,0),
+ .range = 16,
+ .dest_type = nir_type_float32);
+
+ nir_variable *color_out =
+ nir_variable_create(b.shader, nir_var_shader_out, glsl_vec_type(4),
+ "outcolor");
+ color_out->data.location = FRAG_RESULT_COLOR;
+
+ /* Write out the color */
+ nir_store_var(&b, color_out, clear_color, 0xf);
+
+ return st_nir_finish_builtin_shader(st, b.shader);
+}
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