[spirv] Add method to erase data from code buffer

src/spirv/spirv_code_buffer.cpp

@@ -132,6 +132,13 @@ namespace dxvk {
   }
   
   
+  void SpirvCodeBuffer::erase(size_t size) {
+    m_code.erase(
+      m_code.begin() + m_ptr,
+      m_code.begin() + m_ptr + size);
+  }
+
+
   uint32_t SpirvCodeBuffer::strLen(const char* str) {
     // Null-termination plus padding
     return (std::strlen(str) + 4) / 4;

src/spirv/spirv_code_buffer.h

@@ -148,6 +148,15 @@ namespace dxvk {
      * \param [in] boundIds Number of bound IDs
      */
     void putHeader(uint32_t boundIds);
+
+    /**
+     * \brief Erases given number of dwords
+     *
+     * Removes data from the code buffer, starting
+     * at the current insertion offset.
+     * \param [in] size Number of words to remove
+     */
+    void erase(size_t size);
     
     /**
      * \brief Computes length of a literal string