Support for automap options and resource binding shift (#2834)

* Support for automap options

- Added glslang_shader_options_t with enums for auto map bindings and
  auto map locations.
- Added options param to glslang_shader_parse.
- Modified glslang_shader_parse to call appropriate auto map function if
  auto map bits are set.

* Refactored auto map for C interface

- Added glslang_shader_set_options to independently set options instead
  of being a param on an existing function.
- Added glslang_program_map_io to call mapIO so auto map location
  actually works.

* Added support for shifting resource bindings

- Added resource binding shift functions to match C++ interface

* Uncommented preprocessor call that was commented out for debugging

glslang/CInterface/glslang_c_interface.cpp

@@ -346,6 +346,29 @@ GLSLANG_EXPORT glslang_shader_t* glslang_shader_create(const glslang_input_t* in
     return shader;
 }
 
+GLSLANG_EXPORT void glslang_shader_shift_binding(glslang_shader_t* shader, glslang_resource_type_t res, unsigned int base)
+{
+    const glslang::TResourceType res_type = glslang::TResourceType(res);
+    shader->shader->setShiftBinding(res_type, base);
+}
+
+GLSLANG_EXPORT void glslang_shader_shift_binding_for_set(glslang_shader_t* shader, glslang_resource_type_t res, unsigned int base, unsigned int set)
+{
+    const glslang::TResourceType res_type = glslang::TResourceType(res);
+    shader->shader->setShiftBindingForSet(res_type, base, set);
+}
+
+GLSLANG_EXPORT void glslang_shader_set_options(glslang_shader_t* shader, int options)
+{
+    if (options & GLSLANG_SHADER_AUTO_MAP_BINDINGS) {
+        shader->shader->setAutoMapBindings(true);
+    }
+
+    if (options & GLSLANG_SHADER_AUTO_MAP_LOCATIONS) {
+        shader->shader->setAutoMapLocations(true);
+    }
+}
+
 GLSLANG_EXPORT const char* glslang_shader_get_preprocessed_code(glslang_shader_t* shader)
 {
     return shader->preprocessedGLSL.c_str();
@@ -419,6 +442,11 @@ GLSLANG_EXPORT int glslang_program_link(glslang_program_t* program, int messages
     return (int)program->program->link((EShMessages)messages);
 }
 
+GLSLANG_EXPORT int glslang_program_map_io(glslang_program_t* program)
+{
+    return (int)program->program->mapIO();
+}
+
 GLSLANG_EXPORT const char* glslang_program_get_info_log(glslang_program_t* program)
 {
     return program->program->getInfoLog();

glslang/Include/glslang_c_interface.h

@@ -224,6 +224,9 @@ GLSLANG_EXPORT void glslang_finalize_process();
 
 GLSLANG_EXPORT glslang_shader_t* glslang_shader_create(const glslang_input_t* input);
 GLSLANG_EXPORT void glslang_shader_delete(glslang_shader_t* shader);
+GLSLANG_EXPORT void glslang_shader_shift_binding(glslang_shader_t* shader, glslang_resource_type_t res, unsigned int base);
+GLSLANG_EXPORT void glslang_shader_shift_binding_for_set(glslang_shader_t* shader, glslang_resource_type_t res, unsigned int base, unsigned int set);
+GLSLANG_EXPORT void glslang_shader_set_options(glslang_shader_t* shader, int options); // glslang_shader_options_t
 GLSLANG_EXPORT int glslang_shader_preprocess(glslang_shader_t* shader, const glslang_input_t* input);
 GLSLANG_EXPORT int glslang_shader_parse(glslang_shader_t* shader, const glslang_input_t* input);
 GLSLANG_EXPORT const char* glslang_shader_get_preprocessed_code(glslang_shader_t* shader);
@@ -234,6 +237,7 @@ GLSLANG_EXPORT glslang_program_t* glslang_program_create();
 GLSLANG_EXPORT void glslang_program_delete(glslang_program_t* program);
 GLSLANG_EXPORT void glslang_program_add_shader(glslang_program_t* program, glslang_shader_t* shader);
 GLSLANG_EXPORT int glslang_program_link(glslang_program_t* program, int messages); // glslang_messages_t
+GLSLANG_EXPORT int glslang_program_map_io(glslang_program_t* program);
 GLSLANG_EXPORT void glslang_program_SPIRV_generate(glslang_program_t* program, glslang_stage_t stage);
 GLSLANG_EXPORT size_t glslang_program_SPIRV_get_size(glslang_program_t* program);
 GLSLANG_EXPORT void glslang_program_SPIRV_get(glslang_program_t* program, unsigned int*);

glslang/Include/glslang_c_shader_types.h

@@ -181,6 +181,25 @@ typedef enum {
     LAST_ELEMENT_MARKER(GLSLANG_PROFILE_COUNT),
 } glslang_profile_t;
 
+/* Shader options */
+typedef enum {
+    GLSLANG_SHADER_DEFAULT_BIT = 0,
+    GLSLANG_SHADER_AUTO_MAP_BINDINGS = (1 << 0),
+    GLSLANG_SHADER_AUTO_MAP_LOCATIONS = (2 << 0),
+    LAST_ELEMENT_MARKER(GLSLANG_SHADER_COUNT),
+} glslang_shader_options_t;
+
+/* TResourceType counterpart */
+typedef enum {
+    GLSLANG_RESOURCE_TYPE_SAMPLER,
+    GLSLANG_RESOURCE_TYPE_TEXTURE,
+    GLSLANG_RESOURCE_TYPE_IMAGE,
+    GLSLANG_RESOURCE_TYPE_UBO,
+    GLSLANG_RESOURCE_TYPE_SSBO,
+    GLSLANG_RESOURCE_TYPE_UAV,
+    LAST_ELEMENT_MARKER(GLSLANG_RESOURCE_TYPE_COUNT),
+} glslang_resource_type_t;
+
 #undef LAST_ELEMENT_MARKER
 
 #endif