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iris: fix line-aa-width

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we should probably move the roundf to st_atom_raster
This commit is contained in:
Kenneth Graunke 2018-08-21 11:30:09 -07:00
parent 701b47a197
commit d2516358f9
1 changed files with 33 additions and 1 deletions
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34
src/gallium/drivers/iris/iris_state.c
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@ -824,6 +824,36 @@ struct iris_rasterizer_state {
uint16_t sprite_coord_enable;
};
static float
get_line_width(const struct pipe_rasterizer_state *state)
{
float line_width = state->line_width;
/* From the OpenGL 4.4 spec:
*
* "The actual width of non-antialiased lines is determined by rounding
* the supplied width to the nearest integer, then clamping it to the
* implementation-dependent maximum non-antialiased line width."
*/
if (!state->multisample && !state->line_smooth)
line_width = roundf(state->line_width);
if (!state->multisample && state->line_smooth && line_width < 1.5f) {
/* For 1 pixel line thickness or less, the general anti-aliasing
* algorithm gives up, and a garbage line is generated. Setting a
* Line Width of 0.0 specifies the rasterization of the "thinnest"
* (one-pixel-wide), non-antialiased lines.
*
* Lines rendered with zero Line Width are rasterized using the
* "Grid Intersection Quantization" rules as specified by the
* "Zero-Width (Cosmetic) Line Rasterization" section of the docs.
*/
line_width = 0.0f;
}
return line_width;
}
/**
* The pipe->create_rasterizer_state() driver hook.
*/
@ -866,6 +896,8 @@ iris_create_rasterizer_state(struct pipe_context *ctx,
cso->line_stipple_enable = state->line_stipple_enable;
cso->poly_stipple_enable = state->poly_stipple_enable;
float line_width = get_line_width(state);
iris_pack_command(GENX(3DSTATE_SF), cso->sf, sf) {
sf.StatisticsEnable = true;
sf.ViewportTransformEnable = true;
@ -873,7 +905,7 @@ iris_create_rasterizer_state(struct pipe_context *ctx,
sf.LineEndCapAntialiasingRegionWidth =
state->line_smooth ? _10pixels : _05pixels;
sf.LastPixelEnable = state->line_last_pixel;
sf.LineWidth = state->line_width;
sf.LineWidth = line_width;
sf.SmoothPointEnable = state->point_smooth;
sf.PointWidthSource = state->point_size_per_vertex ? Vertex : State;
sf.PointWidth = state->point_size;