impeller::ShaderStageCompatibilityChecker< VertexShaderT, FragmentShaderT > Class Template Reference

#include <shader_stage_compatibility_checker.h>

Static Public Member Functions
static constexpr bool	CompileTimeStrEqual (const char *str1, const char *str2)
static constexpr bool	Check ()

Detailed Description

template<typename VertexShaderT, typename FragmentShaderT>
class impeller::ShaderStageCompatibilityChecker< VertexShaderT, FragmentShaderT >

This is a classed use to check that the input slots of fragment shaders match the output slots of the vertex shaders. If they don't match it will result in linker errors when creating the pipeline. It's not used at runtime.

Definition at line 18 of file shader_stage_compatibility_checker.h.

Member Function Documentation

Check()

template<typename VertexShaderT , typename FragmentShaderT >

static constexpr bool impeller::ShaderStageCompatibilityChecker< VertexShaderT, FragmentShaderT >::Check ( )

inlinestaticconstexpr

Returns true if the shader input slots for the fragment shader match the ones declared as outputs in the vertex shader.

Definition at line 28 of file shader_stage_compatibility_checker.h.

                                {
    constexpr size_t num_outputs = VertexShaderT::kAllShaderStageOutputs.size();
    constexpr size_t num_inputs = FragmentShaderT::kAllShaderStageInputs.size();
 
    if (num_inputs > num_outputs) {
      return false;
    }
 
    for (size_t i = 0; i < num_inputs; ++i) {
      const ShaderStageIOSlot* input_slot =
          FragmentShaderT::kAllShaderStageInputs[i];
      for (size_t j = 0; j < num_outputs; ++j) {
        const ShaderStageIOSlot* output_slot =
            VertexShaderT::kAllShaderStageOutputs[j];
        if (input_slot->location == output_slot->location) {
          if (!CompileTimeStrEqual(input_slot->name, output_slot->name) ||
              input_slot->set != output_slot->set ||
              input_slot->binding != output_slot->binding ||
              input_slot->type != output_slot->type ||
              input_slot->bit_width != output_slot->bit_width ||
              input_slot->vec_size != output_slot->vec_size ||
              input_slot->columns != output_slot->columns ||
              input_slot->offset != output_slot->offset) {
            return false;
          }
        }
      }
    }
 
    return true;
  }

References impeller::ShaderStageIOSlot::binding, impeller::ShaderStageIOSlot::bit_width, impeller::ShaderStageIOSlot::columns, impeller::ShaderStageCompatibilityChecker< VertexShaderT, FragmentShaderT >::CompileTimeStrEqual(), impeller::ShaderStageIOSlot::location, impeller::ShaderStageIOSlot::name, impeller::ShaderStageIOSlot::offset, impeller::ShaderStageIOSlot::set, impeller::ShaderStageIOSlot::type, and impeller::ShaderStageIOSlot::vec_size.

CompileTimeStrEqual()

template<typename VertexShaderT , typename FragmentShaderT >

static constexpr bool impeller::ShaderStageCompatibilityChecker< VertexShaderT, FragmentShaderT >::CompileTimeStrEqual ( const char *  str1, const char *  str2  )

inlinestaticconstexpr

Definition at line 20 of file shader_stage_compatibility_checker.h.

                                                              {
    return *str1 == *str2 &&
           (*str1 == '\0' || CompileTimeStrEqual(str1 + 1, str2 + 1));
  }

Referenced by impeller::ShaderStageCompatibilityChecker< VertexShaderT, FragmentShaderT >::Check().

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The documentation for this class was generated from the following file:

• impeller/renderer/shader_stage_compatibility_checker.h