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authorBrian Paul <[email protected]>2015-08-07 15:21:10 -0600
committerBrian Paul <[email protected]>2015-09-02 09:05:23 -0600
commit9cb2d9ddfacfcf7fe3f91942d0ad147ccafd29cf (patch)
treeaa539600bc901c0e7c2ce27d7f436d6eceddf57b /src/gallium/drivers/svga
parent53d07910c3a3be496f5c789b708a82d2022ecd5b (diff)
svga: add new svga_link.[ch] files
Signed-off-by: Brian Paul <[email protected]>
Diffstat (limited to 'src/gallium/drivers/svga')
-rw-r--r--src/gallium/drivers/svga/svga_link.c120
-rw-r--r--src/gallium/drivers/svga/svga_link.h20
2 files changed, 140 insertions, 0 deletions
diff --git a/src/gallium/drivers/svga/svga_link.c b/src/gallium/drivers/svga/svga_link.c
new file mode 100644
index 00000000000..f3e524d38ea
--- /dev/null
+++ b/src/gallium/drivers/svga/svga_link.c
@@ -0,0 +1,120 @@
+/*/
+ * Copyright 2013 VMware, Inc. All rights reserved.
+ *
+ * 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 the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, 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 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
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * 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.
+ */
+
+
+#include "svga_context.h"
+#include "svga_link.h"
+
+#include "tgsi/tgsi_strings.h"
+
+
+#define INVALID_INDEX 255
+
+
+/**
+ * Examine input and output shaders info to link outputs from the
+ * output shader to inputs from the input shader.
+ * Basically, we'll remap input shader's input slots to new numbers
+ * based on semantic name/index of the outputs from the output shader.
+ */
+void
+svga_link_shaders(const struct tgsi_shader_info *outshader_info,
+ const struct tgsi_shader_info *inshader_info,
+ struct shader_linkage *linkage)
+{
+ unsigned i, free_slot;
+
+ for (i = 0; i < Elements(linkage->input_map); i++) {
+ linkage->input_map[i] = INVALID_INDEX;
+ }
+
+ /* Assign input slots for input shader inputs.
+ * Basically, we want to use the same index for the output shader's outputs
+ * and the input shader's inputs that should be linked together.
+ * We'll modify the input shader's inputs to match the output shader.
+ */
+ assert(inshader_info->num_inputs <=
+ Elements(inshader_info->input_semantic_name));
+
+ /* free register index that can be used for built-in varyings */
+ free_slot = outshader_info->num_outputs + 1;
+
+ for (i = 0; i < inshader_info->num_inputs; i++) {
+ unsigned sem_name = inshader_info->input_semantic_name[i];
+ unsigned sem_index = inshader_info->input_semantic_index[i];
+ unsigned j;
+ /**
+ * Get the clip distance inputs from the output shader's
+ * clip distance shadow copy.
+ */
+ if (sem_name == TGSI_SEMANTIC_CLIPDIST) {
+ linkage->input_map[i] = outshader_info->num_outputs + 1 + sem_index;
+ /* make sure free_slot includes this extra output */
+ free_slot = MAX2(free_slot, linkage->input_map[i] + 1);
+ }
+ else {
+ /* search output shader outputs for same item */
+ for (j = 0; j < outshader_info->num_outputs; j++) {
+ assert(j < Elements(outshader_info->output_semantic_name));
+ if (outshader_info->output_semantic_name[j] == sem_name &&
+ outshader_info->output_semantic_index[j] == sem_index) {
+ linkage->input_map[i] = j;
+ break;
+ }
+ }
+ }
+ }
+
+ linkage->num_inputs = inshader_info->num_inputs;
+
+ /* Things like the front-face register are handled here */
+ for (i = 0; i < inshader_info->num_inputs; i++) {
+ if (linkage->input_map[i] == INVALID_INDEX) {
+ unsigned j = free_slot++;
+ linkage->input_map[i] = j;
+ }
+ }
+
+ /* Debug */
+ if (0) {
+ unsigned reg = 0;
+ for (i = 0; i < linkage->num_inputs; i++) {
+
+ assert(linkage->input_map[i] != INVALID_INDEX);
+
+ debug_printf("input shader input[%d] slot %u %s %u %s\n",
+ i,
+ linkage->input_map[i],
+ tgsi_semantic_names[inshader_info->input_semantic_name[i]],
+ inshader_info->input_semantic_index[i],
+ tgsi_interpolate_names[inshader_info->input_interpolate[i]]);
+
+ /* make sure no repeating register index */
+ if (reg & 1 << linkage->input_map[i]) {
+ assert(0);
+ }
+ reg |= 1 << linkage->input_map[i];
+ }
+ }
+}
diff --git a/src/gallium/drivers/svga/svga_link.h b/src/gallium/drivers/svga/svga_link.h
new file mode 100644
index 00000000000..724c61194a2
--- /dev/null
+++ b/src/gallium/drivers/svga/svga_link.h
@@ -0,0 +1,20 @@
+
+#ifndef SVGA_LINK_H
+#define SVGA_LINK_H
+
+#include "pipe/p_defines.h"
+
+struct svga_context;
+
+struct shader_linkage
+{
+ unsigned num_inputs;
+ ubyte input_map[PIPE_MAX_SHADER_INPUTS];
+};
+
+void
+svga_link_shaders(const struct tgsi_shader_info *outshader_info,
+ const struct tgsi_shader_info *inshader_info,
+ struct shader_linkage *linkage);
+
+#endif /* SVGA_LINK_H */