r300g: add fallback for unaligned/unsupported vertex stride/offset/format

There is a problem though, the translate module cannot emit half float
vertices.

1 files changed, 165 insertions, 0 deletions

diff --git a/src/gallium/drivers/r300/r300_render_translate.c b/src/gallium/drivers/r300/r300_render_translate.c
new file mode 100644
index 0000000000..b03582aac3
--- /dev/null
+++ b/src/gallium/drivers/r300/r300_render_translate.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright 2010 Marek Olšák <maraeo@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE. */
+
+/**
+ * The functions below translate vertex buffers to the layout compatible
+ * with the hardware, so that all vertex fetches are be DWORD-aligned and all
+ * used vertex formats are supported.
+ */
+
+#include "r300_context.h"
+#include "translate/translate.h"
+
+void r300_begin_vertex_translate(struct r300_context *r300)
+{
+    struct pipe_context *pipe = &r300->context;
+    struct translate_key key = {0};
+    struct translate_element *te;
+    unsigned tr_elem_index[PIPE_MAX_ATTRIBS] = {0};
+    struct translate *tr;
+    struct r300_vertex_element_state *ve = r300->velems;
+    boolean vb_translated[PIPE_MAX_ATTRIBS] = {0};
+    void *vb_map[PIPE_MAX_ATTRIBS] = {0}, *out_map;
+    struct pipe_transfer *vb_transfer[PIPE_MAX_ATTRIBS] = {0}, *out_transfer;
+    struct pipe_resource *out_buffer;
+    unsigned i, num_verts;
+
+    /* Initialize the translate key, i.e. the recipe how vertices should be
+     * translated. */
+    for (i = 0; i < ve->count; i++) {
+        struct pipe_vertex_buffer *vb =
+                &r300->vertex_buffer[ve->velem[i].vertex_buffer_index];
+
+        /* Check for support. */
+        if (ve->velem[i].src_format == ve->hw_format[i] &&
+            (vb->buffer_offset + ve->velem[i].src_offset) % 4 == 0 &&
+            vb->stride % 4 == 0) {
+            continue;
+        }
+
+        /* Add this vertex element. */
+        te = &key.element[key.nr_elements];
+        /*te->type;
+        te->instance_divisor;*/
+        te->input_buffer = ve->velem[i].vertex_buffer_index;
+        te->input_format = ve->velem[i].src_format;
+        te->input_offset = vb->buffer_offset + ve->velem[i].src_offset;
+        te->output_format = ve->hw_format[i];
+        te->output_offset = key.output_stride;
+
+        key.output_stride += ve->hw_format_size[i];
+        vb_translated[ve->velem[i].vertex_buffer_index] = TRUE;
+        tr_elem_index[i] = key.nr_elements;
+        key.nr_elements++;
+    }
+
+    /* Get a translate object. */
+    tr = translate_cache_find(r300->tran.translate_cache, &key);
+
+    /* Map buffers we want to translate. */
+    for (i = 0; i < r300->vertex_buffer_count; i++) {
+        if (vb_translated[i]) {
+            struct pipe_vertex_buffer *vb = &r300->vertex_buffer[i];
+
+            vb_map[i] = pipe_buffer_map(pipe, vb->buffer,
+                                        PIPE_TRANSFER_READ, &vb_transfer[i]);
+
+            tr->set_buffer(tr, i, vb_map[i], vb->stride, vb->max_index);
+        }
+    }
+
+    /* Create and map the output buffer. */
+    num_verts = r300->vertex_buffer_max_index + 1;
+
+    out_buffer = pipe_buffer_create(&r300->screen->screen,
+                                    PIPE_BIND_VERTEX_BUFFER,
+                                    key.output_stride * num_verts);
+
+    out_map = pipe_buffer_map(pipe, out_buffer, PIPE_TRANSFER_WRITE,
+                              &out_transfer);
+
+    /* Translate. */
+    tr->run(tr, 0, num_verts, 0, out_map);
+
+    /* Unmap all buffers. */
+    for (i = 0; i < r300->vertex_buffer_count; i++) {
+        if (vb_translated[i]) {
+            pipe_buffer_unmap(pipe, r300->vertex_buffer[i].buffer,
+                              vb_transfer[i]);
+        }
+    }
+
+    pipe_buffer_unmap(pipe, out_buffer, out_transfer);
+
+    /* Setup the new vertex buffer in the first free slot. */
+    for (i = 0; i < PIPE_MAX_ATTRIBS; i++) {
+        struct pipe_vertex_buffer *vb = &r300->vertex_buffer[i];
+
+        if (!vb->buffer) {
+            pipe_resource_reference(&vb->buffer, out_buffer);
+            vb->buffer_offset = 0;
+            vb->max_index = num_verts - 1;
+            vb->stride = key.output_stride;
+            r300->tran.vb_slot = i;
+            break;
+        }
+    }
+
+    /* Save and replace vertex elements. */
+    {
+        struct pipe_vertex_element new_velems[PIPE_MAX_ATTRIBS];
+
+        r300->tran.saved_velems = r300->velems;
+
+        for (i = 0; i < ve->count; i++) {
+            if (vb_translated[ve->velem[i].vertex_buffer_index]) {
+                te = &key.element[tr_elem_index[i]];
+                new_velems[i].instance_divisor = ve->velem[i].instance_divisor;
+                new_velems[i].src_format = te->output_format;
+                new_velems[i].src_offset = te->output_offset;
+                new_velems[i].vertex_buffer_index = r300->tran.vb_slot;
+            } else {
+                memcpy(&new_velems[i], &ve->velem[i],
+                       sizeof(struct pipe_vertex_element));
+            }
+        }
+
+        r300->tran.new_velems =
+            pipe->create_vertex_elements_state(pipe, ve->count, new_velems);
+        pipe->bind_vertex_elements_state(pipe, r300->tran.new_velems);
+    }
+
+    pipe_resource_reference(&out_buffer, NULL);
+}
+
+void r300_end_vertex_translate(struct r300_context *r300)
+{
+    struct pipe_context *pipe = &r300->context;
+
+    /* Restore vertex elements. */
+    pipe->bind_vertex_elements_state(pipe, r300->tran.saved_velems);
+    pipe->delete_vertex_elements_state(pipe, r300->tran.new_velems);
+
+    /* Delete the now-unused VBO. */
+    pipe_resource_reference(&r300->vertex_buffer[r300->tran.vb_slot].buffer,
+                            NULL);
+}