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lima: Fix glFrontFace handling

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Bit 12 of render->aux1 is GL_CCW/GL_CW. For GL_CCW (default of glFrontFace) we have
to set that bit active.

This is not what the blob does and what the original reverse engineering documentation
says. The blob sets this value inverted and does some bogus negation of the fragment
shaders gl_FrontFacing variable instead.

Anyway, doing it this way does not cause regressions but fixes
dEQP-GLES2.functional.shaders.builtin_variable.frontfacing and 4 piglit tests.

Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Andreas Baierl <ichgeh@imkreisrum.de>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7690>
This commit is contained in:
Andreas Baierl 2020-11-19 16:38:11 +01:00
parent 03097f30fb
commit 187f786108
3 changed files with 10 additions and 2 deletions
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1
src/gallium/drivers/lima/ci/deqp-lima-fails.txt
View file

@ -30,7 +30,6 @@ dEQP-GLES2.functional.fragment_ops.depth_stencil.random.7,Fail
dEQP-GLES2.functional.fragment_ops.depth_stencil.random.8,Fail
dEQP-GLES2.functional.fragment_ops.depth_stencil.random.9,Fail
dEQP-GLES2.functional.fragment_ops.depth_stencil.write_mask.stencil,Fail
dEQP-GLES2.functional.shaders.builtin_variable.frontfacing,Fail
dEQP-GLES2.functional.shaders.indexing.matrix_subscript.mat4_dynamic_loop_write_dynamic_loop_read_vertex,Fail
dEQP-GLES2.functional.shaders.indexing.matrix_subscript.mat4_dynamic_loop_write_dynamic_read_vertex,Fail
dEQP-GLES2.functional.shaders.indexing.matrix_subscript.mat4_dynamic_loop_write_static_loop_read_vertex,Fail

5
src/gallium/drivers/lima/lima_draw.c
View file

@ -721,7 +721,10 @@ lima_pack_render_state(struct lima_context *ctx, const struct pipe_draw_info *in
render->textures_address = 0x00000000;
render->aux0 = (ctx->vs->state.varying_stride >> 3);
render->aux1 = 0x00001000;
render->aux1 = 0x00000000;
if (ctx->rasterizer->base.front_ccw)
render->aux1 = 0x00001000;
if (ctx->blend->base.dither)
render->aux1 |= 0x00002000;

6
src/gallium/drivers/lima/lima_parser.c
View file

@ -641,6 +641,12 @@ parse_rsw(FILE *fp, uint32_t *value, int i, uint32_t *helper)
fprintf(fp, ": ");
if ((*value & 0x00002000) == 0x00002000)
fprintf(fp, "blend->base.dither true, ");
if ((*value & 0x00001000) == 0x00001000)
fprintf(fp, "glFrontFace(GL_CCW), ");
else
fprintf(fp, "glFrontFace(GL_CW), ");
if ((*value & 0x00010000) == 0x00010000)
fprintf(fp, "ctx->const_buffer[PIPE_SHADER_FRAGMENT].buffer true ");
fprintf(fp, "*/\n");