diff options
Diffstat (limited to 'src/gallium/drivers')
| -rw-r--r-- | src/gallium/drivers/radeonsi/si_state_viewport.c | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/src/gallium/drivers/radeonsi/si_state_viewport.c b/src/gallium/drivers/radeonsi/si_state_viewport.c index dac90df1c4f..64bb956b200 100644 --- a/src/gallium/drivers/radeonsi/si_state_viewport.c +++ b/src/gallium/drivers/radeonsi/si_state_viewport.c @@ -185,6 +185,16 @@ static void si_emit_guardband(struct si_context *ctx) const unsigned hw_screen_offset_alignment = ctx->chip_class >= VI ? 16 : MAX2(ctx->screen->se_tile_repeat, 16); + /* Indexed by quantization modes */ + static unsigned max_viewport_size[] = {65535, 16383, 4095}; + + /* Ensure that the whole viewport stays representable in + * absolute coordinates. + * See comment in si_set_viewport_states. + */ + assert(vp_as_scissor.maxx <= max_viewport_size[vp_as_scissor.quant_mode] && + vp_as_scissor.maxy <= max_viewport_size[vp_as_scissor.quant_mode]); + hw_screen_offset_x = CLAMP(hw_screen_offset_x, 0, MAX_PA_SU_HARDWARE_SCREEN_OFFSET); hw_screen_offset_y = CLAMP(hw_screen_offset_y, 0, MAX_PA_SU_HARDWARE_SCREEN_OFFSET); @@ -219,7 +229,6 @@ static void si_emit_guardband(struct si_context *ctx) * * The viewport range is [-max_viewport_size/2, max_viewport_size/2]. */ - static unsigned max_viewport_size[] = {65535, 16383, 4095}; assert(vp_as_scissor.quant_mode < ARRAY_SIZE(max_viewport_size)); max_range = max_viewport_size[vp_as_scissor.quant_mode] / 2; left = (-max_range - vp.translate[0]) / vp.scale[0]; @@ -333,6 +342,8 @@ static void si_set_viewport_states(struct pipe_context *pctx, unsigned h = scissor->maxy - scissor->miny; unsigned max_extent = MAX2(w, h); + int max_corner = MAX2(scissor->maxx, scissor->maxy); + unsigned center_x = (scissor->maxx + scissor->minx) / 2; unsigned center_y = (scissor->maxy + scissor->miny) / 2; unsigned max_center = MAX2(center_x, center_y); @@ -358,7 +369,22 @@ static void si_set_viewport_states(struct pipe_context *pctx, if (ctx->family == CHIP_RAVEN) max_extent = 16384; /* Use QUANT_MODE == 16_8. */ - if (max_extent <= 1024) /* 4K scanline area for guardband */ + /* Another constraint is that all coordinates in the viewport + * are representable in fixed point with respect to the + * surface origin. + * + * It means that PA_SU_HARDWARE_SCREEN_OFFSET can't be given + * an offset that would make the upper corner of the viewport + * greater than the maximum representable number post + * quantization, ie 2^quant_bits. + * + * This does not matter for 14.10 and 16.8 formats since the + * offset is already limited at 8k, but it means we can't use + * 12.12 if we are drawing to some pixels outside the lower + * 4k x 4k of the render target. + */ + + if (max_extent <= 1024 && max_corner < 4096) /* 4K scanline area for guardband */ scissor->quant_mode = SI_QUANT_MODE_12_12_FIXED_POINT_1_4096TH; else if (max_extent <= 4096) /* 16K scanline area for guardband */ scissor->quant_mode = SI_QUANT_MODE_14_10_FIXED_POINT_1_1024TH; |