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i965/blorp: Add support for flat input buffer

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Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Topi Pohjolainen 2016-05-15 08:33:16 +03:00
parent 9b2fa17e97
commit 89e6b4ef5d
1 changed files with 65 additions and 3 deletions
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68
src/mesa/drivers/dri/i965/gen6_blorp.c
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@ -33,11 +33,46 @@
#include "vbo/vbo.h"
#include "brw_draw.h"
static void
gen6_blorp_emit_input_varying_data(struct brw_context *brw,
const struct brw_blorp_params *params,
unsigned *offset,
unsigned *size)
{
const unsigned vec4_size_in_bytes = 4 * sizeof(float);
const unsigned max_num_varyings =
DIV_ROUND_UP(sizeof(params->wm_inputs), vec4_size_in_bytes);
const unsigned num_varyings = params->wm_prog_data->num_varying_inputs;
*size = num_varyings * vec4_size_in_bytes;
const float *const inputs_src = (const float *)&params->wm_inputs;
float *inputs = (float *)brw_state_batch(brw, AUB_TRACE_VERTEX_BUFFER,
*size, 32, offset);
/* Walk over the attribute slots, determine if the attribute is used by
* the program and when necessary copy the values from the input storage to
* the vertex data buffer.
*/
for (unsigned i = 0; i < max_num_varyings; i++) {
const gl_varying_slot attr = VARYING_SLOT_VAR0 + i;
if (!(params->wm_prog_data->inputs_read & BITFIELD64_BIT(attr)))
continue;
memcpy(inputs, inputs_src + i * 4, vec4_size_in_bytes);
inputs += 4;
}
}
static void
gen6_blorp_emit_vertex_data(struct brw_context *brw,
const struct brw_blorp_params *params)
{
uint32_t vertex_offset;
uint32_t const_data_offset = 0;
unsigned const_data_size = 0;
/* Setup VBO for the rectangle primitive..
*
@ -65,6 +100,11 @@ gen6_blorp_emit_vertex_data(struct brw_context *brw,
* dw6: Vertex Position Z.
* dw7: Vertex Position W.
*
* dw8: Flat vertex input 0
* dw9: Flat vertex input 1
* ...
* dwn: Flat vertex input n - 8
*
* For details, see the Sandybridge PRM, Volume 2, Part 1, Section 1.5.1
* "Vertex URB Entry (VUE) Formats".
*
@ -72,8 +112,11 @@ gen6_blorp_emit_vertex_data(struct brw_context *brw,
* zero and W to one. Header words dw0-3 are all zero. There is no need to
* include the fixed values in the vertex buffer. Vertex fetcher can be
* instructed to fill vertex elements with constant values of one and zero
* instead of reading them from the buffer. See the vertex element setup
* below.
* instead of reading them from the buffer.
* Flat inputs are program constants that are not interpolated. Moreover
* their values will be the same between vertices.
*
* See the vertex element setup below.
*/
const float vertices[] = {
/* v0 */ (float)params->x0, (float)params->y1,
@ -87,8 +130,13 @@ gen6_blorp_emit_vertex_data(struct brw_context *brw,
&vertex_offset);
memcpy(vertex_data, vertices, sizeof(vertices));
if (params->wm_prog_data && params->wm_prog_data->num_varying_inputs)
gen6_blorp_emit_input_varying_data(brw, params,
&const_data_offset,
&const_data_size);
/* 3DSTATE_VERTEX_BUFFERS */
const int num_buffers = 1;
const int num_buffers = 1 + (const_data_size > 0);
const int batch_length = 1 + 4 * num_buffers;
BEGIN_BATCH(batch_length);
@ -99,6 +147,20 @@ gen6_blorp_emit_vertex_data(struct brw_context *brw,
EMIT_VERTEX_BUFFER_STATE(brw, 0 /* buffer_nr */, brw->batch.bo,
vertex_offset, vertex_offset + sizeof(vertices),
stride, 0 /* steprate */);
if (const_data_size) {
/* Tell vertex fetcher not to advance the pointer in the buffer when
* moving to the next vertex. This will effectively provide the same
* data for all the vertices. For flat inputs only the data provided
* for the first provoking vertex actually matters.
*/
const unsigned stride_zero = 0;
EMIT_VERTEX_BUFFER_STATE(brw, 1 /* buffer_nr */, brw->batch.bo,
const_data_offset,
const_data_offset + const_data_size,
stride_zero, 0 /* step_rate */);
}
ADVANCE_BATCH();
}