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v3d: add lowering for OpenGL logic operations

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This implements support for OpenGL logic operations by emitting code to read
from the TLB if needed and blending the fragment output accordingly. It is
similar to VC4's blend lowering pass, but exclusive to logic operations, since
blending is otherwise supported in hardware.

The pass doesn't handle MSAA targets yet.

Fixes the following piglit tests:
spec/!opengl 1.0/gl-1.0-logicop/*
spec/!opengl 1.1/gl-1.1-xor
spec/!opengl 1.1/gl-1.1-xor-copypixels

It also fixes text cursor rendering in Libreoffice with the GTK+2 theme, which
is rendered via glamor using the XOR logic operation.

v2: fix checks for allowed variable location and maximum render target (Eric)

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Iago Toral Quiroga
2019-07-03 09:38:39 +02:00
parent 7c1d708911
commit e540775f0c
4 changed files with 279 additions and 0 deletions
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1
src/broadcom/compiler/v3d_compiler.h
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@@ -812,6 +812,7 @@ bool vir_opt_small_immediates(struct v3d_compile *c);
bool vir_opt_vpm(struct v3d_compile *c);
void v3d_nir_lower_blend(nir_shader *s, struct v3d_compile *c);
void v3d_nir_lower_io(nir_shader *s, struct v3d_compile *c);
void v3d_nir_lower_logic_ops(nir_shader *s, struct v3d_compile *c);
void v3d_nir_lower_scratch(nir_shader *s);
void v3d_nir_lower_txf_ms(nir_shader *s, struct v3d_compile *c);
void v3d_nir_lower_image_load_store(nir_shader *s);