diff options
| -rw-r--r-- | src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp index 5a7e25a274c..7ada3476961 100644 --- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp +++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp @@ -6266,6 +6266,34 @@ compile_tgsi_instruction(struct st_translate *t, } } +/* Invert SamplePos.y when rendering to the default framebuffer. */ +static void +emit_samplepos_adjustment(struct st_translate *t, int wpos_y_transform) +{ + struct ureg_program *ureg = t->ureg; + + assert(wpos_y_transform >= 0); + struct ureg_src trans_const = ureg_DECL_constant(ureg, wpos_y_transform); + struct ureg_src samplepos_sysval = t->systemValues[SYSTEM_VALUE_SAMPLE_POS]; + struct ureg_dst samplepos_flipped = ureg_DECL_temporary(ureg); + struct ureg_dst is_fbo = ureg_DECL_temporary(ureg); + + ureg_ADD(ureg, ureg_writemask(samplepos_flipped, TGSI_WRITEMASK_Y), + ureg_imm1f(ureg, 1), ureg_negate(samplepos_sysval)); + + /* If trans.x == 1, use samplepos.y, else use 1 - samplepos.y. */ + ureg_FSEQ(ureg, ureg_writemask(is_fbo, TGSI_WRITEMASK_Y), + ureg_scalar(trans_const, TGSI_SWIZZLE_X), ureg_imm1f(ureg, 1)); + ureg_UCMP(ureg, ureg_writemask(samplepos_flipped, TGSI_WRITEMASK_Y), + ureg_src(is_fbo), samplepos_sysval, ureg_src(samplepos_flipped)); + ureg_MOV(ureg, ureg_writemask(samplepos_flipped, TGSI_WRITEMASK_X), + samplepos_sysval); + + /* Use the result in place of the system value. */ + t->systemValues[SYSTEM_VALUE_SAMPLE_POS] = ureg_src(samplepos_flipped); +} + + /** * Emit the TGSI instructions for inverting and adjusting WPOS. * This code is unavoidable because it also depends on whether @@ -6833,6 +6861,10 @@ st_translate_program( emit_wpos(st_context(ctx), t, proginfo, ureg, program->wpos_transform_const); + if (procType == PIPE_SHADER_FRAGMENT && + semName == TGSI_SEMANTIC_SAMPLEPOS) + emit_samplepos_adjustment(t, program->wpos_transform_const); + sysInputs &= ~(1ull << i); } } @@ -7144,7 +7176,8 @@ get_mesa_program_tgsi(struct gl_context *ctx, /* This must be done before the uniform storage is associated. */ if (shader->Stage == MESA_SHADER_FRAGMENT && (prog->info.inputs_read & VARYING_BIT_POS || - prog->info.system_values_read & (1ull << SYSTEM_VALUE_FRAG_COORD))) { + prog->info.system_values_read & (1ull << SYSTEM_VALUE_FRAG_COORD) || + prog->info.system_values_read & (1ull << SYSTEM_VALUE_SAMPLE_POS))) { static const gl_state_index16 wposTransformState[STATE_LENGTH] = { STATE_INTERNAL, STATE_FB_WPOS_Y_TRANSFORM }; |