Mesa (master): gallium/swr: Make flat shading tris work.

[Tim Rowley]

Module: Mesa
Branch: master
Commit: f69a61b1aa7f7fc8dd190cb3d5da1e7bca7de809
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f69a61b1aa7f7fc8dd190cb3d5da1e7bca7de809

Author: George Kyriazis <george.kyriazis at intel.com>
Date:   Wed Apr 13 10:48:55 2016 -0500

gallium/swr: Make flat shading tris work.

- Incorporate flatshade flag into the shader generation
- Use provoking vertex (vc) in shader when flat shading.

Reviewed-by: Bruce Cherniak <bruce.cherniak at intel.com>

---

 src/gallium/drivers/swr/swr_shader.cpp | 4 ++++
 src/gallium/drivers/swr/swr_shader.h   | 1 +
 2 files changed, 5 insertions(+)

diff --git a/src/gallium/drivers/swr/swr_shader.cpp b/src/gallium/drivers/swr/swr_shader.cpp
index 90f0f22..83e3216 100644
--- a/src/gallium/drivers/swr/swr_shader.cpp
+++ b/src/gallium/drivers/swr/swr_shader.cpp
@@ -102,6 +102,7 @@ swr_generate_fs_key(struct swr_jit_fs_key &key,
 
    key.nr_cbufs = ctx->framebuffer.nr_cbufs;
    key.light_twoside = ctx->rasterizer->light_twoside;
+   key.flatshade = ctx->rasterizer->flatshade;
    memcpy(&key.vs_output_semantic_name,
           &ctx->vs->info.base.output_semantic_name,
           sizeof(key.vs_output_semantic_name));
@@ -491,6 +492,9 @@ BuilderSWR::CompileFS(struct swr_context *ctx, swr_jit_fs_key &key)
 
             if (interpMode == TGSI_INTERPOLATE_CONSTANT) {
                inputs[attrib][channel] = wrap(va);
+            } else if ((interpMode == TGSI_INTERPOLATE_COLOR) &&
+                       (key.flatshade == true)) {
+               inputs[attrib][channel] = wrap(vc);
             } else {
                Value *vk = FSUB(FSUB(VIMMED1(1.0f), vi), vj);
 
diff --git a/src/gallium/drivers/swr/swr_shader.h b/src/gallium/drivers/swr/swr_shader.h
index 4814b9d..3f79570 100644
--- a/src/gallium/drivers/swr/swr_shader.h
+++ b/src/gallium/drivers/swr/swr_shader.h
@@ -51,6 +51,7 @@ struct swr_jit_sampler_key {
 struct swr_jit_fs_key : swr_jit_sampler_key {
    unsigned nr_cbufs;
    unsigned light_twoside;
+   unsigned flatshade;
    ubyte vs_output_semantic_name[PIPE_MAX_SHADER_OUTPUTS];
    ubyte vs_output_semantic_idx[PIPE_MAX_SHADER_OUTPUTS];
 };