etnaviv: SINGLE_BUFFER support on GC3000

This patch adds support for the SINGLE_BUFFER feature on GC3000
GPUs, which allows rendering to a single buffer using multiple pixel
pipes.

This feature is always used when it is available, which means that
multi-tiled formats are no longer being used in that case, and all
buffers will be normal (super)tiled. This mimics the behavior of the
blob on GC3000.

- Because the same format can be used to render to and texture from,
  this avoids an extra resolve pass when rendering to texture.

- i.MX6qp includes a PRE which can scan-out directly from tiled formats,
  avoiding untiling overhead.

Signed-off-by: Wladimir J. van der Laan <[email protected]>
Reviewed-by: Christian Gmeiner <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/gallium/drivers/etnaviv/etnaviv_internal.h b/src/gallium/drivers/etnaviv/etnaviv_internal.h
index 2f09d555bc2..2f8dacbce5f 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_internal.h
+++ b/src/gallium/drivers/etnaviv/etnaviv_internal.h
@@ -72,6 +72,8 @@ struct etna_specs {
    unsigned has_shader_range_registers : 1;
    /* has the new sin/cos functions */
    unsigned has_new_sin_cos : 1;
+   /* supports single-buffer rendering with multiple pixel pipes */
+   unsigned single_buffer : 1;
    /* can use any kind of wrapping mode on npot textures */
    unsigned npot_tex_any_wrap;
    /* number of bits per TS tile */
@@ -191,6 +193,7 @@ struct compiled_framebuffer_state {
    uint32_t TS_COLOR_CLEAR_VALUE;
    struct etna_reloc TS_COLOR_STATUS_BASE;
    struct etna_reloc TS_COLOR_SURFACE_BASE;
+   uint32_t PE_LOGIC_OP;
    bool msaa_mode; /* adds input (and possible temp) to PS */
 };