On Sat, 2015-11-21 at 19:02 +1100, Timothy Arceri wrote: > From: Gregory Hainaut <gregory.hain...@gmail.com> > > The value will be set in separate-shader program when an input/output > must remains active. e.g. when deadcode removal isn't allowed because > it will create interface location/name-matching mismatch. > > v3: > * Rename the attribute > * Use ir_variable directly instead of ir_variable_refcount_visitor > * Move the foreach IR code in the linker file > > v4: > * Fix variable name in assert > > v5 (by Timothy Arceri): > * Rename functions and reword comments > * Don't set alway active on builtins > > Signed-off-by: Gregory Hainaut <gregory.hain...@gmail.com> > Reviewed-by: Timothy Arceri <timothy.arc...@collabora.com> > --- > src/glsl/ir.cpp | 1 + > src/glsl/ir.h | 7 ++++++ > src/glsl/linker.cpp | 72 > +++++++++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 80 insertions(+) > > diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp > index ca520f5..f989e9b 100644 > --- a/src/glsl/ir.cpp > +++ b/src/glsl/ir.cpp > @@ -1669,6 +1669,7 @@ ir_variable::ir_variable(const struct glsl_type *type, > const char *name, > this->data.pixel_center_integer = false; > this->data.depth_layout = ir_depth_layout_none; > this->data.used = false; > + this->data.always_active_io = false; > this->data.read_only = false; > this->data.centroid = false; > this->data.sample = false; > diff --git a/src/glsl/ir.h b/src/glsl/ir.h > index 386c993..6eb703b 100644 > --- a/src/glsl/ir.h > +++ b/src/glsl/ir.h > @@ -659,6 +659,13 @@ public: > unsigned assigned:1; > > /** > + * When separate shader programs are enabled, only input/outputs > between > + * the stages of a multi-stage separate program can be safely removed > + * from the shader interface. Other input/outputs must remains > active. > + */ > + unsigned always_active_io:1; > + > + /** > * Enum indicating how the variable was declared. See > * ir_var_declaration_type. > * > diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp > index 1db7b7a..9b6efa9 100644 > --- a/src/glsl/linker.cpp > +++ b/src/glsl/linker.cpp > @@ -3988,6 +3988,75 @@ split_ubos_and_ssbos(void *mem_ctx, > assert(*num_ubos + *num_ssbos == num_blocks); > } > > +static void > +set_always_active_io(exec_list *ir, ir_variable_mode io_mode) > +{ > + assert(io_mode == ir_var_shader_in || io_mode == ir_var_shader_out); > + > + foreach_in_list(ir_instruction, node, ir) { > + ir_variable *const var = node->as_variable(); > + > + /* Don't set alway active on builtins */ > + if (var == NULL || var->data.mode != io_mode || > + var->data.how_declared == ir_var_declared_implicitly) > + continue;
Note: I've changed this locally for clarity to: if (var == NULL || var->data.mode != io_mode) continue; /* Don't set alway active on builtins that haven't been redeclared */ if(var->data.how_declared == ir_var_declared_implicitly) continue; > + > + var->data.always_active_io = true; > + } > +} > + > +/** > + * When separate shader programs are enabled, only input/outputs between > + * the stages of a multi-stage separate program can be safely removed > + * from the shader interface. Other input/outputs must remains active. > + */ > +static void > +disable_varying_optimizations_for_sso(struct gl_shader_program *prog) > +{ > + unsigned first, last; > + assert(prog->SeparateShader); > + > + first = MESA_SHADER_STAGES; > + last = 0; > + > + /* Determine first and last stage. Excluding the compute stage */ > + for (unsigned i = 0; i < MESA_SHADER_COMPUTE; i++) { > + if (!prog->_LinkedShaders[i]) > + continue; > + if (first == MESA_SHADER_STAGES) > + first = i; > + last = i; > + } > + > + if (first == MESA_SHADER_STAGES) > + return; > + > + for (unsigned stage = 0; stage < MESA_SHADER_STAGES; stage++) { > + gl_shader *sh = prog->_LinkedShaders[stage]; > + if (!sh) > + continue; > + > + if (first == last) { > + /* For a single shader program only allow inputs to the vertex > shader > + * and outputs from the fragment shader to be removed. > + */ > + if (stage != MESA_SHADER_VERTEX) > + set_always_active_io(sh->ir, ir_var_shader_in); > + if (stage != MESA_SHADER_FRAGMENT) > + set_always_active_io(sh->ir, ir_var_shader_out); > + } else { > + /* For multi-stage separate shader programs only allow inputs and > + * outputs between the shader stages to be removed as well as > inputs > + * to the vertex shader and outputs from the fragment shader. > + */ > + if (stage == first && stage != MESA_SHADER_VERTEX) > + set_always_active_io(sh->ir, ir_var_shader_in); > + else if (stage == last && stage != MESA_SHADER_FRAGMENT) > + set_always_active_io(sh->ir, ir_var_shader_out); > + } > + } > +} > + > void > link_shaders(struct gl_context *ctx, struct gl_shader_program *prog) > { > @@ -4255,6 +4324,9 @@ link_shaders(struct gl_context *ctx, struct > gl_shader_program *prog) > } > } > > + if (prog->SeparateShader) > + disable_varying_optimizations_for_sso(prog); > + > if (!interstage_cross_validate_uniform_blocks(prog)) > goto done; > _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev