vrend: refactor vrend_resource buffer alloc

Add vrend_resource_alloc_buffer to allocate the storage for PIPE_BUFFER.

This is a refactor with no real change.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Gert Wollny <gert.wollny@collabora.com>

src/vrend_renderer.c

@@ -6589,6 +6589,65 @@ static void vrend_create_buffer(struct vrend_resource *gr, uint32_t width, uint3
    glBindBufferARB(gr->target, 0);
 }
 
+static int
+vrend_resource_alloc_buffer(struct vrend_resource *gr, uint32_t flags)
+{
+   const uint32_t bind = gr->base.bind;
+   const uint32_t size = gr->base.width0;
+
+   if (bind == VIRGL_BIND_CUSTOM) {
+      /* use iovec directly when attached */
+      gr->storage_bits |= VREND_STORAGE_HOST_SYSTEM_MEMORY;
+      gr->ptr = malloc(size);
+      if (!gr->ptr)
+         return -ENOMEM;
+   } else if (bind == VIRGL_BIND_STAGING) {
+     /* staging buffers only use guest memory -- nothing to do. */
+   } else if (bind == VIRGL_BIND_INDEX_BUFFER) {
+      gr->target = GL_ELEMENT_ARRAY_BUFFER_ARB;
+      vrend_create_buffer(gr, size, flags);
+   } else if (bind == VIRGL_BIND_STREAM_OUTPUT) {
+      gr->target = GL_TRANSFORM_FEEDBACK_BUFFER;
+      vrend_create_buffer(gr, size, flags);
+   } else if (bind == VIRGL_BIND_VERTEX_BUFFER) {
+      gr->target = GL_ARRAY_BUFFER_ARB;
+      vrend_create_buffer(gr, size, flags);
+   } else if (bind == VIRGL_BIND_CONSTANT_BUFFER) {
+      gr->target = GL_UNIFORM_BUFFER;
+      vrend_create_buffer(gr, size, flags);
+   } else if (bind == VIRGL_BIND_QUERY_BUFFER) {
+      gr->target = GL_QUERY_BUFFER;
+      vrend_create_buffer(gr, size, flags);
+   } else if (bind == VIRGL_BIND_COMMAND_ARGS) {
+      gr->target = GL_DRAW_INDIRECT_BUFFER;
+      vrend_create_buffer(gr, size, flags);
+   } else if (bind == 0 || bind == VIRGL_BIND_SHADER_BUFFER) {
+      gr->target = GL_ARRAY_BUFFER_ARB;
+      vrend_create_buffer(gr, size, flags);
+   } else if (bind & VIRGL_BIND_SAMPLER_VIEW) {
+      /*
+    * On Desktop we use GL_ARB_texture_buffer_object on GLES we use
+    * GL_EXT_texture_buffer (it is in the ANDRIOD extension pack).
+    */
+#if GL_TEXTURE_BUFFER != GL_TEXTURE_BUFFER_EXT
+#error "GL_TEXTURE_BUFFER enums differ, they shouldn't."
+#endif
+
+   /* need to check GL version here */
+      if (has_feature(feat_arb_or_gles_ext_texture_buffer)) {
+         gr->target = GL_TEXTURE_BUFFER;
+      } else {
+         gr->target = GL_PIXEL_PACK_BUFFER_ARB;
+      }
+      vrend_create_buffer(gr, size, flags);
+   } else {
+      vrend_printf("%s: Illegal buffer binding flags 0x%x\n", __func__, bind);
+      return -EINVAL;
+   }
+
+   return 0;
+}
+
 static inline void
 vrend_renderer_resource_copy_args(const struct vrend_renderer_resource_create_args *args,
                                   struct vrend_resource *gr)
@@ -6901,71 +6960,22 @@ vrend_renderer_resource_create(const struct vrend_renderer_resource_create_args
                                void *image_oes)
 {
    struct vrend_resource *gr;
+   int ret;
 
    gr = vrend_resource_create(args);
    if (!gr)
       return NULL;
 
    if (args->target == PIPE_BUFFER) {
-      if (args->bind == VIRGL_BIND_CUSTOM) {
-         /* use iovec directly when attached */
-         gr->storage_bits |= VREND_STORAGE_HOST_SYSTEM_MEMORY;
-         gr->ptr = malloc(args->width);
-         if (!gr->ptr) {
-            FREE(gr);
-            return NULL;
-         }
-      } else if (args->bind == VIRGL_BIND_STAGING) {
-        /* staging buffers only use guest memory -- nothing to do. */
-      } else if (args->bind == VIRGL_BIND_INDEX_BUFFER) {
-         gr->target = GL_ELEMENT_ARRAY_BUFFER_ARB;
-         vrend_create_buffer(gr, args->width, args->flags);
-      } else if (args->bind == VIRGL_BIND_STREAM_OUTPUT) {
-         gr->target = GL_TRANSFORM_FEEDBACK_BUFFER;
-         vrend_create_buffer(gr, args->width, args->flags);
-      } else if (args->bind == VIRGL_BIND_VERTEX_BUFFER) {
-         gr->target = GL_ARRAY_BUFFER_ARB;
-         vrend_create_buffer(gr, args->width, args->flags);
-      } else if (args->bind == VIRGL_BIND_CONSTANT_BUFFER) {
-         gr->target = GL_UNIFORM_BUFFER;
-         vrend_create_buffer(gr, args->width, args->flags);
-      } else if (args->bind == VIRGL_BIND_QUERY_BUFFER) {
-         gr->target = GL_QUERY_BUFFER;
-         vrend_create_buffer(gr, args->width, args->flags);
-      } else if (args->bind == VIRGL_BIND_COMMAND_ARGS) {
-         gr->target = GL_DRAW_INDIRECT_BUFFER;
-         vrend_create_buffer(gr, args->width, args->flags);
-      } else if (args->bind == 0 || args->bind == VIRGL_BIND_SHADER_BUFFER) {
-         gr->target = GL_ARRAY_BUFFER_ARB;
-         vrend_create_buffer(gr, args->width, args->flags);
-      } else if (args->bind & VIRGL_BIND_SAMPLER_VIEW) {
-         /*
-       * On Desktop we use GL_ARB_texture_buffer_object on GLES we use
-       * GL_EXT_texture_buffer (it is in the ANDRIOD extension pack).
-       */
-#if GL_TEXTURE_BUFFER != GL_TEXTURE_BUFFER_EXT
-#error "GL_TEXTURE_BUFFER enums differ, they shouldn't."
-#endif
-
-      /* need to check GL version here */
-         if (has_feature(feat_arb_or_gles_ext_texture_buffer)) {
-            gr->target = GL_TEXTURE_BUFFER;
+      ret = vrend_resource_alloc_buffer(gr, args->flags);
    } else {
-            gr->target = GL_PIXEL_PACK_BUFFER_ARB;
+      ret = vrend_renderer_resource_allocate_texture(gr, image_oes);
    }
-         vrend_create_buffer(gr, args->width, args->flags);
-      } else {
-         vrend_printf("%s: Illegal buffer binding flags 0x%x\n", __func__, args->bind);
-         FREE(gr);
-         return NULL;
-      }
-   } else {
-      int r = vrend_renderer_resource_allocate_texture(gr, image_oes);
-      if (r) {
+
+   if (ret) {
       FREE(gr);
       return NULL;
    }
-   }
 
    return &gr->base;
 }