glsl: Add image built-in function generator.

Because of the combinatorial explosion of different image built-ins
with different image dimensionalities and base data types, enumerating
all the 242 possibilities would be annoying and a waste of .text
space.  Instead use a special path in the built-in builder that loops
over all the known image types.

v2: Generate built-ins on GLSL version 4.20 too.  Rename
    '_has_float_data_type' to '_supports_float_data_type'.  Avoid
    duplicating enumeration of image built-ins in create_intrinsics()
    and create_builtins().
v3: Use a more orthodox approach for passing image built-in generator
    parameters.
v4: Cosmetic changes.

Acked-by: Paul Berry <stereotype441@gmail.com>

diff --git a/src/glsl/builtin_functions.cpp b/src/glsl/builtin_functions.cpp
index 4ff2212535047b0e09e03adad09e124bcfe91015..2905a3560490d66cf51ec59ac20cb05783fe8430 100644 (file)
--- a/src/glsl/builtin_functions.cpp
+++ b/src/glsl/builtin_functions.cpp
@@ -340,6 +340,13 @@ shader_trinary_minmax(const _mesa_glsl_parse_state *state)
    return state->AMD_shader_trinary_minmax_enable;
 }
 
+static bool
+shader_image_load_store(const _mesa_glsl_parse_state *state)
+{
+   return (state->is_version(420, 0) ||
+           state->ARB_shader_image_load_store_enable);
+}
+
 /** @} */
 
 /******************************************************************************/
@@ -413,6 +420,33 @@ private:
    /** Create a new function and add the given signatures. */
    void add_function(const char *name, ...);
 
+   enum image_function_flags {
+      IMAGE_FUNCTION_EMIT_STUB = (1 << 0),
+      IMAGE_FUNCTION_RETURNS_VOID = (1 << 1),
+      IMAGE_FUNCTION_HAS_VECTOR_DATA_TYPE = (1 << 2),
+      IMAGE_FUNCTION_SUPPORTS_FLOAT_DATA_TYPE = (1 << 3),
+      IMAGE_FUNCTION_READ_ONLY = (1 << 4),
+      IMAGE_FUNCTION_WRITE_ONLY = (1 << 5)
+   };
+
+   /**
+    * Create a new image built-in function for all known image types.
+    * \p flags is a bitfield of \c image_function_flags flags.
+    */
+   void add_image_function(const char *name,
+                           const char *intrinsic_name,
+                           unsigned num_arguments,
+                           unsigned flags);
+
+   /**
+    * Create new functions for all known image built-ins and types.
+    * If \p glsl is \c true, use the GLSL built-in names and emit code
+    * to call into the actual compiler intrinsic.  If \p glsl is
+    * false, emit a function prototype with no body for each image
+    * intrinsic name.
+    */
+   void add_image_functions(bool glsl);
+
    ir_function_signature *new_sig(const glsl_type *return_type,
                                   builtin_available_predicate avail,
                                   int num_params, ...);
@@ -580,6 +614,20 @@ private:
    B1(max3)
    B1(mid3)
 
+   ir_function_signature *_image_prototype(const glsl_type *image_type,
+                                           const char *intrinsic_name,
+                                           unsigned num_arguments,
+                                           unsigned flags);
+   ir_function_signature *_image(const glsl_type *image_type,
+                                 const char *intrinsic_name,
+                                 unsigned num_arguments,
+                                 unsigned flags);
+
+   ir_function_signature *_memory_barrier_intrinsic(
+      builtin_available_predicate avail);
+   ir_function_signature *_memory_barrier(
+      builtin_available_predicate avail);
+
 #undef B0
 #undef B1
 #undef B2
@@ -694,6 +742,12 @@ builtin_builder::create_intrinsics()
    add_function("__intrinsic_atomic_predecrement",
                 _atomic_intrinsic(shader_atomic_counters),
                 NULL);
+
+   add_image_functions(false);
+
+   add_function("__intrinsic_memory_barrier",
+                _memory_barrier_intrinsic(shader_image_load_store),
+                NULL);
 }
 
 /**
@@ -2167,6 +2221,12 @@ builtin_builder::create_builtins()
                 _mid3(glsl_type::uvec4_type),
                 NULL);
 
+   add_image_functions(true);
+
+   add_function("memoryBarrier",
+                _memory_barrier(shader_image_load_store),
+                NULL);
+
 #undef F
 #undef FI
 #undef FIU
@@ -2200,6 +2260,104 @@ builtin_builder::add_function(const char *name, ...)
    shader->symbols->add_function(f);
 }
 
+void
+builtin_builder::add_image_function(const char *name,
+                                    const char *intrinsic_name,
+                                    unsigned num_arguments,
+                                    unsigned flags)
+{
+   static const glsl_type *const types[] = {
+      glsl_type::image1D_type,
+      glsl_type::image2D_type,
+      glsl_type::image3D_type,
+      glsl_type::image2DRect_type,
+      glsl_type::imageCube_type,
+      glsl_type::imageBuffer_type,
+      glsl_type::image1DArray_type,
+      glsl_type::image2DArray_type,
+      glsl_type::imageCubeArray_type,
+      glsl_type::image2DMS_type,
+      glsl_type::image2DMSArray_type,
+      glsl_type::iimage1D_type,
+      glsl_type::iimage2D_type,
+      glsl_type::iimage3D_type,
+      glsl_type::iimage2DRect_type,
+      glsl_type::iimageCube_type,
+      glsl_type::iimageBuffer_type,
+      glsl_type::iimage1DArray_type,
+      glsl_type::iimage2DArray_type,
+      glsl_type::iimageCubeArray_type,
+      glsl_type::iimage2DMS_type,
+      glsl_type::iimage2DMSArray_type,
+      glsl_type::uimage1D_type,
+      glsl_type::uimage2D_type,
+      glsl_type::uimage3D_type,
+      glsl_type::uimage2DRect_type,
+      glsl_type::uimageCube_type,
+      glsl_type::uimageBuffer_type,
+      glsl_type::uimage1DArray_type,
+      glsl_type::uimage2DArray_type,
+      glsl_type::uimageCubeArray_type,
+      glsl_type::uimage2DMS_type,
+      glsl_type::uimage2DMSArray_type
+   };
+   ir_function *f = new(mem_ctx) ir_function(name);
+
+   for (unsigned i = 0; i < Elements(types); ++i) {
+      if (types[i]->sampler_type != GLSL_TYPE_FLOAT ||
+          (flags & IMAGE_FUNCTION_SUPPORTS_FLOAT_DATA_TYPE))
+         f->add_signature(_image(types[i], intrinsic_name,
+                                 num_arguments, flags));
+   }
+
+   shader->symbols->add_function(f);
+}
+
+void
+builtin_builder::add_image_functions(bool glsl)
+{
+   const unsigned flags = (glsl ? IMAGE_FUNCTION_EMIT_STUB : 0);
+
+   add_image_function(glsl ? "imageLoad" : "__intrinsic_image_load",
+                      "__intrinsic_image_load", 0,
+                      (flags | IMAGE_FUNCTION_HAS_VECTOR_DATA_TYPE |
+                       IMAGE_FUNCTION_SUPPORTS_FLOAT_DATA_TYPE |
+                       IMAGE_FUNCTION_READ_ONLY));
+
+   add_image_function(glsl ? "imageStore" : "__intrinsic_image_store",
+                      "__intrinsic_image_store", 1,
+                      (flags | IMAGE_FUNCTION_RETURNS_VOID |
+                       IMAGE_FUNCTION_HAS_VECTOR_DATA_TYPE |
+                       IMAGE_FUNCTION_SUPPORTS_FLOAT_DATA_TYPE |
+                       IMAGE_FUNCTION_WRITE_ONLY));
+
+   add_image_function(glsl ? "imageAtomicAdd" : "__intrinsic_image_atomic_add",
+                      "__intrinsic_image_atomic_add", 1, flags);
+
+   add_image_function(glsl ? "imageAtomicMin" : "__intrinsic_image_atomic_min",
+                      "__intrinsic_image_atomic_min", 1, flags);
+
+   add_image_function(glsl ? "imageAtomicMax" : "__intrinsic_image_atomic_max",
+                      "__intrinsic_image_atomic_max", 1, flags);
+
+   add_image_function(glsl ? "imageAtomicAnd" : "__intrinsic_image_atomic_and",
+                      "__intrinsic_image_atomic_and", 1, flags);
+
+   add_image_function(glsl ? "imageAtomicOr" : "__intrinsic_image_atomic_or",
+                      "__intrinsic_image_atomic_or", 1, flags);
+
+   add_image_function(glsl ? "imageAtomicXor" : "__intrinsic_image_atomic_xor",
+                      "__intrinsic_image_atomic_xor", 1, flags);
+
+   add_image_function((glsl ? "imageAtomicExchange" :
+                       "__intrinsic_image_atomic_exchange"),
+                      "__intrinsic_image_atomic_exchange", 1, flags);
+
+   add_image_function((glsl ? "imageAtomicCompSwap" :
+                       "__intrinsic_image_atomic_comp_swap"),
+                      "__intrinsic_image_atomic_comp_swap", 2, flags);
+}
+
 ir_variable *
 builtin_builder::in_var(const glsl_type *type, const char *name)
 {
@@ -4094,6 +4252,99 @@ builtin_builder::_mid3(const glsl_type *type)
    return sig;
 }
 
+ir_function_signature *
+builtin_builder::_image_prototype(const glsl_type *image_type,
+                                  const char *intrinsic_name,
+                                  unsigned num_arguments,
+                                  unsigned flags)
+{
+   const glsl_type *data_type = glsl_type::get_instance(
+      image_type->sampler_type,
+      (flags & IMAGE_FUNCTION_HAS_VECTOR_DATA_TYPE ? 4 : 1),
+      1);
+   const glsl_type *ret_type = (flags & IMAGE_FUNCTION_RETURNS_VOID ?
+                                glsl_type::void_type : data_type);
+
+   /* Addressing arguments that are always present. */
+   ir_variable *image = in_var(image_type, "image");
+   ir_variable *coord = in_var(
+      glsl_type::ivec(image_type->coordinate_components()), "coord");
+
+   ir_function_signature *sig = new_sig(
+      ret_type, shader_image_load_store, 2, image, coord);
+
+   /* Sample index for multisample images. */
+   if (image_type->sampler_dimensionality == GLSL_SAMPLER_DIM_MS)
+      sig->parameters.push_tail(in_var(glsl_type::int_type, "sample"));
+
+   /* Data arguments. */
+   for (unsigned i = 0; i < num_arguments; ++i)
+      sig->parameters.push_tail(in_var(data_type,
+                                       ralloc_asprintf(NULL, "arg%d", i)));
+
+   /* Set the maximal set of qualifiers allowed for this image
+    * built-in.  Function calls with arguments having fewer
+    * qualifiers than present in the prototype are allowed by the
+    * spec, but not with more, i.e. this will make the compiler
+    * accept everything that needs to be accepted, and reject cases
+    * like loads from write-only or stores to read-only images.
+    */
+   image->data.image.read_only = flags & IMAGE_FUNCTION_READ_ONLY;
+   image->data.image.write_only = flags & IMAGE_FUNCTION_WRITE_ONLY;
+   image->data.image.coherent = true;
+   image->data.image._volatile = true;
+   image->data.image._restrict = true;
+
+   return sig;
+}
+
+ir_function_signature *
+builtin_builder::_image(const glsl_type *image_type,
+                        const char *intrinsic_name,
+                        unsigned num_arguments,
+                        unsigned flags)
+{
+   ir_function_signature *sig = _image_prototype(image_type, intrinsic_name,
+                                                 num_arguments, flags);
+
+   if (flags & IMAGE_FUNCTION_EMIT_STUB) {
+      ir_factory body(&sig->body, mem_ctx);
+      ir_function *f = shader->symbols->get_function(intrinsic_name);
+
+      if (flags & IMAGE_FUNCTION_RETURNS_VOID) {
+         body.emit(call(f, NULL, sig->parameters));
+      } else {
+         ir_variable *ret_val =
+            body.make_temp(sig->return_type, "_ret_val");
+         body.emit(call(f, ret_val, sig->parameters));
+         body.emit(ret(ret_val));
+      }
+
+      sig->is_defined = true;
+
+   } else {
+      sig->is_intrinsic = true;
+   }
+
+   return sig;
+}
+
+ir_function_signature *
+builtin_builder::_memory_barrier_intrinsic(builtin_available_predicate avail)
+{
+   MAKE_INTRINSIC(glsl_type::void_type, avail, 0);
+   return sig;
+}
+
+ir_function_signature *
+builtin_builder::_memory_barrier(builtin_available_predicate avail)
+{
+   MAKE_SIG(glsl_type::void_type, avail, 0);
+   body.emit(call(shader->symbols->get_function("__intrinsic_memory_barrier"),
+                  NULL, sig->parameters));
+   return sig;
+}
+
 /** @} */
 
 /******************************************************************************/