Until we set gl_BaseVertex to zero for non-indexed draw calls
both have an identical value.
The Vertex Elements are kept like that:
* VE 1: <BaseVertex/firstvertex, BaseInstance, VertexID, InstanceID>
* VE 2: <Draw ID, 0, 0, 0>
---
src/intel/compiler/brw_nir.c | 3 +++
src/intel/compiler/brw_vec4.cpp | 1 +
src/mesa/drivers/dri/i965/brw_context.h | 8 ++++++--
src/mesa/drivers/dri/i965/brw_draw.c | 14 +++++++++-----
src/mesa/drivers/dri/i965/brw_draw_upload.c | 7 +++++--
src/mesa/drivers/dri/i965/genX_state_upload.c | 11 +++++++----
6 files changed, 31 insertions(+), 13 deletions(-)
diff --git a/src/intel/compiler/brw_nir.c b/src/intel/compiler/brw_nir.c
index dbddef0d04d..34b1e44adf0 100644
--- a/src/intel/compiler/brw_nir.c
+++ b/src/intel/compiler/brw_nir.c
@@ -239,6 +239,7 @@ brw_nir_lower_vs_inputs(nir_shader *nir,
const bool has_sgvs =
nir->info.system_values_read &
(BITFIELD64_BIT(SYSTEM_VALUE_BASE_VERTEX) |
+ BITFIELD64_BIT(SYSTEM_VALUE_FIRST_VERTEX) |
BITFIELD64_BIT(SYSTEM_VALUE_BASE_INSTANCE) |
BITFIELD64_BIT(SYSTEM_VALUE_VERTEX_ID_ZERO_BASE) |
BITFIELD64_BIT(SYSTEM_VALUE_INSTANCE_ID));
@@ -261,6 +262,7 @@ brw_nir_lower_vs_inputs(nir_shader *nir,
switch (intrin->intrinsic) {
case nir_intrinsic_load_base_vertex:
+ case nir_intrinsic_load_first_vertex:
case nir_intrinsic_load_base_instance:
case nir_intrinsic_load_vertex_id_zero_base:
case nir_intrinsic_load_instance_id:
@@ -278,6 +280,7 @@ brw_nir_lower_vs_inputs(nir_shader *nir,
nir_intrinsic_set_base(load, num_inputs);
switch (intrin->intrinsic) {
case nir_intrinsic_load_base_vertex:
+ case nir_intrinsic_load_first_vertex:
nir_intrinsic_set_component(load, 0);
break;
case nir_intrinsic_load_base_instance:
diff --git a/src/intel/compiler/brw_vec4.cpp b/src/intel/compiler/brw_vec4.cpp
index 36e17d77d47..06c79630119 100644
--- a/src/intel/compiler/brw_vec4.cpp
+++ b/src/intel/compiler/brw_vec4.cpp
@@ -2788,6 +2788,7 @@ brw_compile_vs(const struct brw_compiler *compiler, void
*log_data,
*/
if (shader->info.system_values_read &
(BITFIELD64_BIT(SYSTEM_VALUE_BASE_VERTEX) |
+ BITFIELD64_BIT(SYSTEM_VALUE_FIRST_VERTEX) |
BITFIELD64_BIT(SYSTEM_VALUE_BASE_INSTANCE) |
BITFIELD64_BIT(SYSTEM_VALUE_VERTEX_ID_ZERO_BASE) |
BITFIELD64_BIT(SYSTEM_VALUE_INSTANCE_ID))) {
diff --git a/src/mesa/drivers/dri/i965/brw_context.h
b/src/mesa/drivers/dri/i965/brw_context.h
index 9046acd175c..0a20706567e 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -881,8 +881,12 @@ struct brw_context
struct {
struct {
- /** The value of gl_BaseVertex for the current _mesa_prim. */
- int gl_basevertex;
+ /**
+ * Either the value of gl_BaseVertex for indexed draw calls or the
+ * value of the argument <first> for non-indexed draw calls for the
+ * current _mesa_prim.
+ */
+ int firstvertex;
/** The value of gl_BaseInstance for the current _mesa_prim. */
int gl_baseinstance;
diff --git a/src/mesa/drivers/dri/i965/brw_draw.c
b/src/mesa/drivers/dri/i965/brw_draw.c
index 50cf8b12c74..a1a5161fd35 100644
--- a/src/mesa/drivers/dri/i965/brw_draw.c
+++ b/src/mesa/drivers/dri/i965/brw_draw.c
@@ -816,25 +816,29 @@ brw_draw_single_prim(struct gl_context *ctx,
* always flag if the shader uses one of the values. For direct draws,
* we only flag if the values change.
*/
- const int new_basevertex =
+ const int new_firstvertex =
prim->indexed ? prim->basevertex : prim->start;
const int new_baseinstance = prim->base_instance;
const struct brw_vs_prog_data *vs_prog_data =
brw_vs_prog_data(brw->vs.base.prog_data);
if (prim_id > 0) {
- const bool uses_draw_parameters =
+ const bool uses_firstvertex =
vs_prog_data->uses_basevertex ||
+ vs_prog_data->uses_firstvertex;
+
+ const bool uses_draw_parameters =
+ uses_firstvertex ||
vs_prog_data->uses_baseinstance;
if ((uses_draw_parameters && prim->is_indirect) ||
- (vs_prog_data->uses_basevertex &&
- brw->draw.params.gl_basevertex != new_basevertex) ||
+ (uses_firstvertex &&
+ brw->draw.params.firstvertex != new_firstvertex) ||
(vs_prog_data->uses_baseinstance &&
brw->draw.params.gl_baseinstance != new_baseinstance))
brw->ctx.NewDriverState |= BRW_NEW_VERTICES;
}
- brw->draw.params.gl_basevertex = new_basevertex;
+ brw->draw.params.firstvertex = new_firstvertex;
brw->draw.params.gl_baseinstance = new_baseinstance;
brw_bo_unreference(brw->draw.draw_params_bo);
diff --git a/src/mesa/drivers/dri/i965/brw_draw_upload.c
b/src/mesa/drivers/dri/i965/brw_draw_upload.c
index 9b81999ea05..52bf752bff9 100644
--- a/src/mesa/drivers/dri/i965/brw_draw_upload.c
+++ b/src/mesa/drivers/dri/i965/brw_draw_upload.c
@@ -696,8 +696,11 @@ brw_prepare_shader_draw_parameters(struct brw_context *brw)
const struct brw_vs_prog_data *vs_prog_data =
brw_vs_prog_data(brw->vs.base.prog_data);
- /* For non-indirect draws, upload gl_BaseVertex. */
- if ((vs_prog_data->uses_basevertex || vs_prog_data->uses_baseinstance) &&
+ const bool uses_firstvertex =
+ vs_prog_data->uses_basevertex || vs_prog_data->uses_firstvertex;
+
+ /* For non-indirect draws, upload the shader draw parameters */
+ if ((uses_firstvertex || vs_prog_data->uses_baseinstance) &&
brw->draw.draw_params_bo == NULL) {
intel_upload_data(brw, &brw->draw.params, sizeof(brw->draw.params), 4,
&brw->draw.draw_params_bo,
diff --git a/src/mesa/drivers/dri/i965/genX_state_upload.c
b/src/mesa/drivers/dri/i965/genX_state_upload.c
index d0a980f9730..2f2a573fd05 100644
--- a/src/mesa/drivers/dri/i965/genX_state_upload.c
+++ b/src/mesa/drivers/dri/i965/genX_state_upload.c
@@ -488,7 +488,10 @@ genX(emit_vertices)(struct brw_context *brw)
}
#endif
- const bool needs_sgvs_element = (vs_prog_data->uses_basevertex ||
+ const bool uses_firstvertex =
+ vs_prog_data->uses_basevertex || vs_prog_data->uses_firstvertex;
+
+ const bool needs_sgvs_element = (uses_firstvertex ||
vs_prog_data->uses_baseinstance ||
vs_prog_data->uses_instanceid ||
vs_prog_data->uses_vertexid);
@@ -533,7 +536,7 @@ genX(emit_vertices)(struct brw_context *brw)
/* Now emit 3DSTATE_VERTEX_BUFFERS and 3DSTATE_VERTEX_ELEMENTS packets. */
const bool uses_draw_params =
- vs_prog_data->uses_basevertex ||
+ uses_firstvertex ||
vs_prog_data->uses_baseinstance;
const unsigned nr_buffers = brw->vb.nr_buffers +
uses_draw_params + vs_prog_data->uses_drawid;
@@ -711,7 +714,7 @@ genX(emit_vertices)(struct brw_context *brw)
};
#if GEN_GEN >= 8
- if (vs_prog_data->uses_basevertex ||
+ if (uses_firstvertex ||
vs_prog_data->uses_baseinstance) {
elem_state.VertexBufferIndex = brw->vb.nr_buffers;
elem_state.SourceElementFormat = (enum GENX(SURFACE_FORMAT))
ISL_FORMAT_R32G32_UINT;
@@ -721,7 +724,7 @@ genX(emit_vertices)(struct brw_context *brw)
#else
elem_state.VertexBufferIndex = brw->vb.nr_buffers;
elem_state.SourceElementFormat = (enum GENX(SURFACE_FORMAT))
ISL_FORMAT_R32G32_UINT;
- if (vs_prog_data->uses_basevertex)
+ if (uses_firstvertex)
elem_state.Component0Control = VFCOMP_STORE_SRC;
if (vs_prog_data->uses_baseinstance)
--
2.14.1
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