wined3d: Reuse the shader buffer between shaders.

dlls/wined3d/baseshader.c

@@ -138,15 +138,20 @@ const struct wined3d_shader_frontend *shader_select_frontend(DWORD version_token
     }
 }
 
-void shader_buffer_init(struct SHADER_BUFFER *buffer)
+void shader_buffer_clear(struct SHADER_BUFFER *buffer)
 {
-    buffer->buffer = HeapAlloc(GetProcessHeap(), 0, SHADER_PGMSIZE);
     buffer->buffer[0] = '\0';
     buffer->bsize = 0;
     buffer->lineNo = 0;
     buffer->newline = TRUE;
 }
 
+void shader_buffer_init(struct SHADER_BUFFER *buffer)
+{
+    buffer->buffer = HeapAlloc(GetProcessHeap(), 0, SHADER_PGMSIZE);
+    shader_buffer_clear(buffer);
+}
+
 void shader_buffer_free(struct SHADER_BUFFER *buffer)
 {
     HeapFree(GetProcessHeap(), 0, buffer->buffer);

dlls/wined3d/wined3d_private.h

@@ -2601,6 +2601,7 @@ typedef struct IWineD3DBaseShaderImpl {
     IWineD3DBaseShaderClass         baseShader;
 } IWineD3DBaseShaderImpl;
 
+void shader_buffer_clear(struct SHADER_BUFFER *buffer);
 void shader_buffer_init(struct SHADER_BUFFER *buffer);
 void shader_buffer_free(struct SHADER_BUFFER *buffer);
 void shader_cleanup(IWineD3DBaseShader *iface);