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radeonsi: create get_base_vertex() helper

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Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
This commit is contained in:
Timothy Arceri 2018-02-26 21:59:43 +11:00
parent ae47af50d6
commit 7f91473414
1 changed files with 20 additions and 14 deletions
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34
src/gallium/drivers/radeonsi/si_shader.c
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@ -1908,6 +1908,25 @@ static LLVMValueRef get_sample_id(struct si_shader_context *ctx)
return unpack_param(ctx, SI_PARAM_ANCILLARY, 8, 4);
}
static LLVMValueRef get_base_vertex(struct ac_shader_abi *abi)
{
struct si_shader_context *ctx = si_shader_context_from_abi(abi);
/* For non-indexed draws, the base vertex set by the driver
* (for direct draws) or the CP (for indirect draws) is the
* first vertex ID, but GLSL expects 0 to be returned.
*/
LLVMValueRef vs_state = LLVMGetParam(ctx->main_fn,
ctx->param_vs_state_bits);
LLVMValueRef indexed;
indexed = LLVMBuildLShr(ctx->ac.builder, vs_state, ctx->i32_1, "");
indexed = LLVMBuildTrunc(ctx->ac.builder, indexed, ctx->i1, "");
return LLVMBuildSelect(ctx->ac.builder, indexed, ctx->abi.base_vertex,
ctx->i32_0, "");
}
static LLVMValueRef get_block_size(struct ac_shader_abi *abi)
{
struct si_shader_context *ctx = si_shader_context_from_abi(abi);
@ -2068,21 +2087,8 @@ void si_load_system_value(struct si_shader_context *ctx,
break;
case TGSI_SEMANTIC_BASEVERTEX:
{
/* For non-indexed draws, the base vertex set by the driver
* (for direct draws) or the CP (for indirect draws) is the
* first vertex ID, but GLSL expects 0 to be returned.
*/
LLVMValueRef vs_state = LLVMGetParam(ctx->main_fn, ctx->param_vs_state_bits);
LLVMValueRef indexed;
indexed = LLVMBuildLShr(ctx->ac.builder, vs_state, ctx->i32_1, "");
indexed = LLVMBuildTrunc(ctx->ac.builder, indexed, ctx->i1, "");
value = LLVMBuildSelect(ctx->ac.builder, indexed,
ctx->abi.base_vertex, ctx->i32_0, "");
value = get_base_vertex(&ctx->abi);
break;
}
case TGSI_SEMANTIC_BASEINSTANCE:
value = ctx->abi.start_instance;