gallium: consolidate bypass_vs and bypass_clipping flags

The draw module provides a similar interface to the driver which
is retained as various bits of hardware may be able to take on
incremental parts of the vertex pipeline.  However, there's no
need to advertise all this complexity to the state tracker.

There are basically two modes now - normal and passthrough/screen-coords.

12 files changed, 45 insertions, 77 deletions

diff --git a/src/gallium/auxiliary/draw/draw_context.c b/src/gallium/auxiliary/draw/draw_context.c
index 581532c1c9f..a4f1fcddc1a 100644
--- a/src/gallium/auxiliary/draw/draw_context.c
+++ b/src/gallium/auxiliary/draw/draw_context.c
@@ -127,7 +127,7 @@ void draw_set_rasterizer_state( struct draw_context *draw,
 
    draw->rasterizer = raster;
    draw->bypass_clipping =
-      ((draw->rasterizer && draw->rasterizer->bypass_clipping) ||
+      ((draw->rasterizer && draw->rasterizer->bypass_vs_clip_and_viewport) ||
        draw->driver.bypass_clipping);
 }
 
@@ -139,7 +139,7 @@ void draw_set_driver_clipping( struct draw_context *draw,
 
    draw->driver.bypass_clipping = bypass_clipping;
    draw->bypass_clipping =
-      ((draw->rasterizer && draw->rasterizer->bypass_clipping) ||
+      ((draw->rasterizer && draw->rasterizer->bypass_vs_clip_and_viewport) ||
        draw->driver.bypass_clipping);
 }
 
diff --git a/src/gallium/auxiliary/draw/draw_pt.c b/src/gallium/auxiliary/draw/draw_pt.c
index 4e5ffa09305..9ea0cbe5990 100644
--- a/src/gallium/auxiliary/draw/draw_pt.c
+++ b/src/gallium/auxiliary/draw/draw_pt.c
@@ -87,7 +87,7 @@ draw_pt_arrays(struct draw_context *draw,
          opt |= PT_CLIPTEST;
       }
       
-      if (!draw->rasterizer->bypass_vs) {
+      if (!draw->rasterizer->bypass_vs_clip_and_viewport) {
          opt |= PT_SHADE;
       }
    }
diff --git a/src/gallium/auxiliary/draw/draw_pt.h b/src/gallium/auxiliary/draw/draw_pt.h
index aecaeee5b9e..6f3e1e0289b 100644
--- a/src/gallium/auxiliary/draw/draw_pt.h
+++ b/src/gallium/auxiliary/draw/draw_pt.h
@@ -215,7 +215,7 @@ boolean draw_pt_post_vs_run( struct pt_post_vs *pvs,
 
 void draw_pt_post_vs_prepare( struct pt_post_vs *pvs,
 			      boolean bypass_clipping,
-			      boolean identity_viewport,
+			      boolean bypass_viewport,
 			      boolean opengl );
 
 struct pt_post_vs *draw_pt_post_vs_create( struct draw_context *draw );
diff --git a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c
index cd9cd4b53fd..44147aed9be 100644
--- a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c
+++ b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c
@@ -101,7 +101,8 @@ static void fse_prepare( struct draw_pt_middle_end *middle,
    fse->key.nr_elements = MAX2(fse->key.nr_outputs,     /* outputs - translate to hw format */
                                fse->key.nr_inputs);     /* inputs - fetch from api format */
 
-   fse->key.viewport = !draw->identity_viewport;
+   fse->key.viewport = (!draw->rasterizer->bypass_vs_clip_and_viewport &&
+                        !draw->identity_viewport);
    fse->key.clip = !draw->bypass_clipping;
    fse->key.const_vbuffers = 0;
 
diff --git a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline.c b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline.c
index 38f9b604d37..11ac90fc563 100644
--- a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline.c
+++ b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline.c
@@ -84,7 +84,8 @@ static void fetch_pipeline_prepare( struct draw_pt_middle_end *middle,
     */
    draw_pt_post_vs_prepare( fpme->post_vs,
 			    (boolean)draw->bypass_clipping,
-			    (boolean)draw->identity_viewport,
+			    (boolean)(draw->identity_viewport ||
+                                      draw->rasterizer->bypass_vs_clip_and_viewport),
 			    (boolean)draw->rasterizer->gl_rasterization_rules );
 			    
 
@@ -140,9 +141,9 @@ static void fetch_pipeline_run( struct draw_pt_middle_end *middle,
 		      (char *)pipeline_verts );
 
    /* Run the shader, note that this overwrites the data[] parts of
-    * the pipeline verts.  If there is no shader, ie a bypass shader,
-    * then the inputs == outputs, and are already in the correct
-    * place.
+    * the pipeline verts.  If there is no shader, eg if
+    * bypass_vs_clip_and_viewport, then the inputs == outputs, and are
+    * already in the correct place.
     */
    if (opt & PT_SHADE)
    {
@@ -216,9 +217,9 @@ static void fetch_pipeline_linear_run( struct draw_pt_middle_end *middle,
                              (char *)pipeline_verts );
 
    /* Run the shader, note that this overwrites the data[] parts of
-    * the pipeline verts.  If there is no shader, ie a bypass shader,
-    * then the inputs == outputs, and are already in the correct
-    * place.
+    * the pipeline verts.  If there is no shader, ie if
+    * bypass_vs_clip_and_viewport, then the inputs == outputs, and are
+    * already in the correct place.
     */
    if (opt & PT_SHADE)
    {
@@ -286,9 +287,9 @@ static boolean fetch_pipeline_linear_run_elts( struct draw_pt_middle_end *middle
                              (char *)pipeline_verts );
 
    /* Run the shader, note that this overwrites the data[] parts of
-    * the pipeline verts.  If there is no shader, ie a bypass shader,
-    * then the inputs == outputs, and are already in the correct
-    * place.
+    * the pipeline verts.  If there is no shader, ie if
+    * bypass_vs_clip_and_viewport, then the inputs == outputs, and are
+    * already in the correct place.
     */
    if (opt & PT_SHADE)
    {
diff --git a/src/gallium/auxiliary/draw/draw_pt_post_vs.c b/src/gallium/auxiliary/draw/draw_pt_post_vs.c
index 96dc706b998..00d7197b132 100644
--- a/src/gallium/auxiliary/draw/draw_pt_post_vs.c
+++ b/src/gallium/auxiliary/draw/draw_pt_post_vs.c
@@ -200,11 +200,11 @@ boolean draw_pt_post_vs_run( struct pt_post_vs *pvs,
 
 void draw_pt_post_vs_prepare( struct pt_post_vs *pvs,
 			      boolean bypass_clipping,
-			      boolean identity_viewport,
+			      boolean bypass_viewport,
 			      boolean opengl )
 {
    if (bypass_clipping) {
-      if (identity_viewport)
+      if (bypass_viewport)
 	 pvs->run = post_vs_none;
       else
 	 pvs->run = post_vs_viewport;
diff --git a/src/gallium/auxiliary/util/u_blit.c b/src/gallium/auxiliary/util/u_blit.c
index 98bb6a2ce70..deb68c43a6c 100644
--- a/src/gallium/auxiliary/util/u_blit.c
+++ b/src/gallium/auxiliary/util/u_blit.c
@@ -102,8 +102,7 @@ util_create_blit(struct pipe_context *pipe, struct cso_context *cso)
    memset(&ctx->rasterizer, 0, sizeof(ctx->rasterizer));
    ctx->rasterizer.front_winding = PIPE_WINDING_CW;
    ctx->rasterizer.cull_mode = PIPE_WINDING_NONE;
-   ctx->rasterizer.bypass_clipping = 1;
-   /*ctx->rasterizer.bypass_vs = 1;*/
+   ctx->rasterizer.bypass_vs_clip_and_viewport = 1;
    ctx->rasterizer.gl_rasterization_rules = 1;
 
    /* samplers */
@@ -116,17 +115,10 @@ util_create_blit(struct pipe_context *pipe, struct cso_context *cso)
    ctx->sampler.mag_img_filter = 0; /* set later */
    ctx->sampler.normalized_coords = 1;
 
-   /* viewport (identity, we setup vertices in wincoords) */
-   ctx->viewport.scale[0] = 1.0;
-   ctx->viewport.scale[1] = 1.0;
-   ctx->viewport.scale[2] = 1.0;
-   ctx->viewport.scale[3] = 1.0;
-   ctx->viewport.translate[0] = 0.0;
-   ctx->viewport.translate[1] = 0.0;
-   ctx->viewport.translate[2] = 0.0;
-   ctx->viewport.translate[3] = 0.0;
-
-   /* vertex shader */
+
+   /* vertex shader - still required to provide the linkage between
+    * fragment shader input semantics and vertex_element/buffers.
+    */
    {
       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
                                       TGSI_SEMANTIC_GENERIC };
@@ -374,13 +366,11 @@ util_blit_pixels(struct blit_state *ctx,
    cso_save_framebuffer(ctx->cso);
    cso_save_fragment_shader(ctx->cso);
    cso_save_vertex_shader(ctx->cso);
-   cso_save_viewport(ctx->cso);
 
    /* set misc state we care about */
    cso_set_blend(ctx->cso, &ctx->blend);
    cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
-   cso_set_viewport(ctx->cso, &ctx->viewport);
 
    /* sampler */
    ctx->sampler.min_img_filter = filter;
@@ -422,7 +412,6 @@ util_blit_pixels(struct blit_state *ctx,
    cso_restore_framebuffer(ctx->cso);
    cso_restore_fragment_shader(ctx->cso);
    cso_restore_vertex_shader(ctx->cso);
-   cso_restore_viewport(ctx->cso);
 
    pipe_texture_reference(&tex, NULL);
 }
@@ -485,13 +474,11 @@ util_blit_pixels_tex(struct blit_state *ctx,
    cso_save_framebuffer(ctx->cso);
    cso_save_fragment_shader(ctx->cso);
    cso_save_vertex_shader(ctx->cso);
-   cso_save_viewport(ctx->cso);
 
    /* set misc state we care about */
    cso_set_blend(ctx->cso, &ctx->blend);
    cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
-   cso_set_viewport(ctx->cso, &ctx->viewport);
 
    /* sampler */
    ctx->sampler.min_img_filter = filter;
@@ -536,5 +523,4 @@ util_blit_pixels_tex(struct blit_state *ctx,
    cso_restore_framebuffer(ctx->cso);
    cso_restore_fragment_shader(ctx->cso);
    cso_restore_vertex_shader(ctx->cso);
-   cso_restore_viewport(ctx->cso);
 }
diff --git a/src/gallium/auxiliary/util/u_gen_mipmap.c b/src/gallium/auxiliary/util/u_gen_mipmap.c
index 847b4a6075e..df4a8668630 100644
--- a/src/gallium/auxiliary/util/u_gen_mipmap.c
+++ b/src/gallium/auxiliary/util/u_gen_mipmap.c
@@ -62,7 +62,6 @@ struct gen_mipmap_state
    struct pipe_depth_stencil_alpha_state depthstencil;
    struct pipe_rasterizer_state rasterizer;
    struct pipe_sampler_state sampler;
-   struct pipe_viewport_state viewport;
 
    void *vs;
    void *fs;
@@ -1292,8 +1291,7 @@ util_create_gen_mipmap(struct pipe_context *pipe,
    memset(&ctx->rasterizer, 0, sizeof(ctx->rasterizer));
    ctx->rasterizer.front_winding = PIPE_WINDING_CW;
    ctx->rasterizer.cull_mode = PIPE_WINDING_NONE;
-   ctx->rasterizer.bypass_clipping = 1;
-   /*ctx->rasterizer.bypass_vs = 1;*/
+   ctx->rasterizer.bypass_vs_clip_and_viewport = 1;
    ctx->rasterizer.gl_rasterization_rules = 1;
 
    /* sampler state */
@@ -1304,17 +1302,9 @@ util_create_gen_mipmap(struct pipe_context *pipe,
    ctx->sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NEAREST;
    ctx->sampler.normalized_coords = 1;
 
-   /* viewport state (identity, verts are in wincoords) */
-   ctx->viewport.scale[0] = 1.0;
-   ctx->viewport.scale[1] = 1.0;
-   ctx->viewport.scale[2] = 1.0;
-   ctx->viewport.scale[3] = 1.0;
-   ctx->viewport.translate[0] = 0.0;
-   ctx->viewport.translate[1] = 0.0;
-   ctx->viewport.translate[2] = 0.0;
-   ctx->viewport.translate[3] = 0.0;
-
-   /* vertex shader */
+   /* vertex shader - still needed to specify mapping from fragment
+    * shader input semantics to vertex elements 
+    */
    {
       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
                                       TGSI_SEMANTIC_GENERIC };
@@ -1465,13 +1455,11 @@ util_gen_mipmap(struct gen_mipmap_state *ctx,
    cso_save_framebuffer(ctx->cso);
    cso_save_fragment_shader(ctx->cso);
    cso_save_vertex_shader(ctx->cso);
-   cso_save_viewport(ctx->cso);
 
    /* bind our state */
    cso_set_blend(ctx->cso, &ctx->blend);
    cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
    cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
-   cso_set_viewport(ctx->cso, &ctx->viewport);
 
    cso_set_fragment_shader_handle(ctx->cso, ctx->fs);
    cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
@@ -1517,7 +1505,7 @@ util_gen_mipmap(struct gen_mipmap_state *ctx,
 
       cso_set_sampler_textures(ctx->cso, 1, &pt);
 
-      /* quad coords in window coords (bypassing clipping, viewport mapping) */
+      /* quad coords in window coords (bypassing vs, clip and viewport) */
       offset = set_vertex_data(ctx,
                                (float) pt->width[dstLevel],
                                (float) pt->height[dstLevel]);
@@ -1544,5 +1532,4 @@ util_gen_mipmap(struct gen_mipmap_state *ctx,
    cso_restore_framebuffer(ctx->cso);
    cso_restore_fragment_shader(ctx->cso);
    cso_restore_vertex_shader(ctx->cso);
-   cso_restore_viewport(ctx->cso);
 }
diff --git a/src/gallium/drivers/trace/tr_state.c b/src/gallium/drivers/trace/tr_state.c
index 11384b9892b..c305b093354 100644
--- a/src/gallium/drivers/trace/tr_state.c
+++ b/src/gallium/drivers/trace/tr_state.c
@@ -122,8 +122,7 @@ void trace_dump_rasterizer_state(const struct pipe_rasterizer_state *state)
    trace_dump_member(uint, state, line_stipple_factor);
    trace_dump_member(uint, state, line_stipple_pattern);
    trace_dump_member(bool, state, line_last_pixel);
-   trace_dump_member(bool, state, bypass_clipping);
-   trace_dump_member(bool, state, bypass_vs);
+   trace_dump_member(bool, state, bypass_vs_clip_and_viewport);
    trace_dump_member(bool, state, origin_lower_left);
    trace_dump_member(bool, state, flatshade_first);
    trace_dump_member(bool, state, gl_rasterization_rules);
diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index 57a7672d6c3..aad41fab110 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -108,9 +108,15 @@ struct pipe_rasterizer_state
    unsigned line_stipple_factor:8;  /**< [1..256] actually */
    unsigned line_stipple_pattern:16;
    unsigned line_last_pixel:1;
-   unsigned bypass_clipping:1;
-   unsigned bypass_vs:1; /**< Skip the vertex shader.  Note that the shader is
-                            still needed though, to indicate inputs/outputs */
+
+   /** 
+    * Vertex coordinates are pre-transformed to screen space.  Skip
+    * the vertex shader, clipping and viewport processing.  Note that
+    * a vertex shader is still needed though, to indicate the mapping
+    * from vertex elements to fragment shader input semantics.
+    */
+   unsigned bypass_vs_clip_and_viewport:1;
+
    unsigned origin_lower_left:1;  /**< Is (0,0) the lower-left corner? */
    unsigned flatshade_first:1;   /**< take color attribute from the first vertex of a primitive */
    unsigned gl_rasterization_rules:1; /**< enable tweaks for GL rasterization?  */
diff --git a/src/mesa/state_tracker/st_cb_bitmap.c b/src/mesa/state_tracker/st_cb_bitmap.c
index f9f1780ba88..2d547dd0722 100644
--- a/src/mesa/state_tracker/st_cb_bitmap.c
+++ b/src/mesa/state_tracker/st_cb_bitmap.c
@@ -787,7 +787,6 @@ st_init_bitmap(struct st_context *st)
    /* init baseline rasterizer state once */
    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
    st->bitmap.rasterizer.gl_rasterization_rules = 1;
-   st->bitmap.rasterizer.bypass_vs = 1;
 
    /* find a usable texture format */
    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM, PIPE_TEXTURE_2D, 
diff --git a/src/mesa/state_tracker/st_cb_clear.c b/src/mesa/state_tracker/st_cb_clear.c
index 8206733f766..dd9ba2881f9 100644
--- a/src/mesa/state_tracker/st_cb_clear.c
+++ b/src/mesa/state_tracker/st_cb_clear.c
@@ -60,20 +60,11 @@ st_init_clear(struct st_context *st)
 {
    struct pipe_context *pipe = st->pipe;
 
-   /* rasterizer state: bypass clipping */
    memset(&st->clear.raster, 0, sizeof(st->clear.raster));
    st->clear.raster.gl_rasterization_rules = 1;
-   st->clear.raster.bypass_clipping = 1;
-
-   /* viewport state: identity since we're drawing in window coords */
-   st->clear.viewport.scale[0] = 1.0;
-   st->clear.viewport.scale[1] = 1.0;
-   st->clear.viewport.scale[2] = 1.0;
-   st->clear.viewport.scale[3] = 1.0;
-   st->clear.viewport.translate[0] = 0.0;
-   st->clear.viewport.translate[1] = 0.0;
-   st->clear.viewport.translate[2] = 0.0;
-   st->clear.viewport.translate[3] = 0.0;
+
+   /* rasterizer state: bypass vertex shader, clipping and viewport */
+   st->clear.raster.bypass_vs_clip_and_viewport = 1;
 
    /* fragment shader state: color pass-through program */
    st->clear.fs =
@@ -125,8 +116,9 @@ is_depth_stencil_format(enum pipe_format pipeFormat)
 
 /**
  * Draw a screen-aligned quadrilateral.
- * Coords are window coords with y=0=bottom.  These coords will be transformed
- * by the vertex shader and viewport transform (which will flip Y if needed).
+ * Coords are window coords with y=0=bottom.  These will be passed
+ * through unmodified to the rasterizer as we have set
+ * rasterizer->bypass_vs_clip_and_viewport.
  */
 static void
 draw_quad(GLcontext *ctx,
@@ -226,7 +218,6 @@ clear_with_quad(GLcontext *ctx,
    cso_save_blend(st->cso_context);
    cso_save_depth_stencil_alpha(st->cso_context);
    cso_save_rasterizer(st->cso_context);
-   cso_save_viewport(st->cso_context);
    cso_save_fragment_shader(st->cso_context);
    cso_save_vertex_shader(st->cso_context);
 
@@ -278,7 +269,6 @@ clear_with_quad(GLcontext *ctx,
    }
 
    cso_set_rasterizer(st->cso_context, &st->clear.raster);
-   cso_set_viewport(st->cso_context, &st->clear.viewport);
 
    cso_set_fragment_shader_handle(st->cso_context, st->clear.fs);
    cso_set_vertex_shader_handle(st->cso_context, st->clear.vs);
@@ -290,7 +280,6 @@ clear_with_quad(GLcontext *ctx,
    cso_restore_blend(st->cso_context);
    cso_restore_depth_stencil_alpha(st->cso_context);
    cso_restore_rasterizer(st->cso_context);
-   cso_restore_viewport(st->cso_context);
    cso_restore_fragment_shader(st->cso_context);
    cso_restore_vertex_shader(st->cso_context);
 }