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iris: Fix DrawTransformFeedback math when there's a buffer offset 

We need to subtract the starting offset from the final offset before
dividing by the stride.  See src/intel/vulkan/genX_cmd_buffer.c:3142.

Not known to fix anything.
This commit is contained in:
Kenneth Graunke 2019-03-22 00:42:56 -07:00
parent 38db20245b
commit 2208d5a683
3 changed files with 14 additions and 0 deletions
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3
src/gallium/drivers/iris/iris_context.h
View File

@ -782,6 +782,9 @@ bool iris_blorp_upload_shader(struct blorp_batch *blorp_batch,
void iris_math_div32_gpr0(struct iris_context *ice,
struct iris_batch *batch,
uint32_t D);
void iris_math_add32_gpr0(struct iris_context *ice,
struct iris_batch *batch,
uint32_t x);
uint64_t iris_timebase_scale(const struct gen_device_info *devinfo,
uint64_t gpu_timestamp);

9
src/gallium/drivers/iris/iris_query.c
View File

@ -503,6 +503,15 @@ iris_math_div32_gpr0(struct iris_context *ice,
}
}
void
iris_math_add32_gpr0(struct iris_context *ice,
struct iris_batch *batch,
uint32_t x)
{
emit_lri32(batch, CS_GPR(1), x);
emit_alu_add(batch, MI_ALU_R0, MI_ALU_R0, MI_ALU_R1);
}
/*
* GPR0 = (GPR0 == 0) ? 0 : 1;
*/

2
src/gallium/drivers/iris/iris_state.c
View File

@ -5203,6 +5203,8 @@ iris_upload_render_state(struct iris_context *ice,
lrm.MemoryAddress =
ro_bo(iris_resource_bo(so->offset.res), so->offset.offset);
}
if (so->base.buffer_offset)
iris_math_add32_gpr0(ice, batch, -so->base.buffer_offset);
iris_math_div32_gpr0(ice, batch, so->stride);
_iris_emit_lrr(batch, _3DPRIM_VERTEX_COUNT, CS_GPR(0));