emulated fragcoord. a2xx has *some* hw support but it is not practical
Signed-off-by: Jonathan Marek <jonat...@marek.ca>
---
.../drivers/freedreno/a2xx/fd2_compiler.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/src/gallium/drivers/freedreno/a2xx/fd2_compiler.c
b/src/gallium/drivers/freedreno/a2xx/fd2_compiler.c
index 1ce3bc4f82..ab5d16f1a7 100644
--- a/src/gallium/drivers/freedreno/a2xx/fd2_compiler.c
+++ b/src/gallium/drivers/freedreno/a2xx/fd2_compiler.c
@@ -186,6 +186,7 @@ compile_init(struct fd2_compile_context *ctx, struct
fd_program_stateobj *prog,
switch (name) {
case TGSI_SEMANTIC_COLOR:
case TGSI_SEMANTIC_GENERIC:
+ case TGSI_SEMANTIC_POSITION:
ctx->num_param++;
break;
default:
@@ -325,6 +326,8 @@ add_dst_reg(struct fd2_compile_context *ctx, struct
ir2_instruction *alu,
num = ctx->prog->num_exports;
}
} else {
+ /* write to gl_FragCoord.z not possible */
+ assert(ctx->output_export_idx[dst->Index] !=
TGSI_SEMANTIC_POSITION);
num = dst->Index;
}
break;
@@ -1103,6 +1106,7 @@ compile_extra_exports(struct fd2_compile_context *ctx)
{
struct ir2_shader *shader = ctx->so->ir;
struct ir2_instruction *instr;
+ int fragcoord = ctx->prog->export_linkage[TGSI_SEMANTIC_POSITION];
int position = ctx->num_regs[TGSI_FILE_INPUT] + 1;
unsigned i;
/* XXX hacky way to get new temporaries */
@@ -1122,6 +1126,18 @@ compile_extra_exports(struct fd2_compile_context *ctx)
ir2_reg_create(instr, tmp, "wwww", 0);
ir2_dst_create(instr, tmp + 1, "xyzw", 0);
+ if (fragcoord != 0xff) {
+ instr = ir2_instr_create_alu_v(shader, MULADDv);
+ ir2_reg_create(instr, 66, "xyzw", IR2_REG_CONST);
+ ir2_reg_create(instr, tmp + 1, "xyzw", 0);
+ ir2_reg_create(instr, 65, "xyzw", IR2_REG_CONST);
+ ir2_dst_create(instr, fragcoord, "xyz_", IR2_REG_EXPORT);
+
+ instr = ir2_instr_create_alu_s(shader, MAXs);
+ ir2_reg_create(instr, tmp, "wwww", 0);
+ ir2_dst_create(instr, fragcoord, "___w", IR2_REG_EXPORT);
+ }
+
/* these two instructions could be avoided with constant folding
* but it would be hard to implement..
*/
--
2.17.1
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