Implement new draw_vertices() path for simple vertex array drawing, use it for glClear.

src/mesa/pipe/draw/draw_context.h

@@ -70,5 +70,10 @@ void draw_set_vertex_attributes( struct draw_context *draw,
 void draw_vb(struct draw_context *draw,
 	     struct vertex_buffer *VB );
 
+void draw_vertices(struct draw_context *draw,
+                   GLuint mode,
+                   GLuint numVertex, const GLfloat *verts,
+                   GLuint numAttribs, const GLuint attribs[]);
+
 
 #endif /* DRAW_CONTEXT_H */

src/mesa/pipe/draw/draw_vb.c

@@ -57,7 +57,7 @@ static void draw_allocate_vertices( struct draw_context *draw,
 				    GLuint nr_vertices )
 {
    draw->nr_vertices = nr_vertices;
-   draw->verts = MALLOC( nr_vertices * draw->vertex_size );
+   draw->verts = (GLubyte *) malloc( nr_vertices * draw->vertex_size );
 
    draw->pipeline.first->begin( draw->pipeline.first );
 }
@@ -453,7 +453,7 @@ static void draw_release_vertices( struct draw_context *draw )
 {
    draw->pipeline.first->end( draw->pipeline.first );
 
-   FREE(draw->verts);
+   free(draw->verts);
    draw->verts = NULL;
 }
 
@@ -646,6 +646,63 @@ void draw_vb(struct draw_context *draw,
 }
 
 
+/**
+ * XXX Temporary mechanism to draw simple vertex arrays.
+ * All attribs are GLfloat[4].  Arrays are interleaved, in GL-speak.
+ */
+void
+draw_vertices(struct draw_context *draw,
+              GLuint mode,
+              GLuint numVerts, const GLfloat *vertices,
+              GLuint numAttrs, const GLuint attribs[])
+{
+   /*GLuint first, incr;*/
+   GLuint i, j;
+
+   assert(mode <= GL_POLYGON);
+
+   draw->vertex_size
+      = sizeof(struct vertex_header) + numAttrs * 4 * sizeof(GLfloat);
+
+   /*draw_prim_info(mode, &first, &incr);*/
+   draw_allocate_vertices( draw, numVerts );
+   if (draw->prim != mode) 
+      draw_set_prim( draw, mode );
+
+   /* setup attr info */
+   draw->nr_attrs = numAttrs + 2;
+   draw->attrs[0].attrib = VF_ATTRIB_VERTEX_HEADER;
+   draw->attrs[0].format = EMIT_1F;
+   draw->attrs[1].attrib = VF_ATTRIB_CLIP_POS;
+   draw->attrs[1].format = EMIT_4F;
+   for (j = 0; j < numAttrs; j++) {
+      draw->vf_attr_to_slot[attribs[j]] = 2+j;
+      draw->attrs[2+j].attrib = attribs[j];
+      draw->attrs[2+j].format = EMIT_4F;
+   }
+
+   /* build vertices */
+   for (i = 0; i < numVerts; i++) {
+      struct vertex_header *v
+         = (struct vertex_header *) (draw->verts + i * draw->vertex_size);
+      v->clipmask = 0x0;
+      v->edgeflag = 0;
+      for (j = 0; j < numAttrs; j++) {
+         COPY_4FV(v->data[j], vertices + (i * numAttrs + j) * 4);
+      }
+   }
+
+   /* draw */
+   draw_prim(draw, 0, numVerts);
+
+   /* clean up */
+   draw_release_vertices( draw );
+   draw->verts = NULL;
+   draw->in_vb = 0;
+}
+
+
+
 /**
  * Accumulate another attribute's info.
  * Note the "- 2" factor here.  We need this because the vertex->data[]

src/mesa/pipe/p_context.h

@@ -55,6 +55,11 @@ struct pipe_context {
    void (*draw_vb)( struct pipe_context *pipe,
 		    struct vertex_buffer *VB );
 
+   void (*draw_vertices)( struct pipe_context *pipe,
+                          GLuint mode,
+                          GLuint numVertex, const GLfloat *verts,
+                          GLuint numAttribs, const GLuint attribs[]);
+
    /** Clear framebuffer */
    void (*clear)(struct pipe_context *pipe, GLboolean color, GLboolean depth,
                  GLboolean stencil);

src/mesa/pipe/softpipe/sp_context.c

@@ -102,6 +102,25 @@ static void softpipe_draw_vb( struct pipe_context *pipe,
 }
 
 
+static void
+softpipe_draw_vertices(struct pipe_context *pipe,
+                       GLuint mode,
+                       GLuint numVertex, const GLfloat *verts,
+                       GLuint numAttribs, const GLuint attribs[])
+{
+   struct softpipe_context *softpipe = softpipe_context( pipe );
+
+   if (softpipe->dirty)
+      softpipe_update_derived( softpipe );
+
+   /* XXX move mapping/unmapping to higher/coarser level? */
+   map_surfaces(softpipe);
+   draw_vertices(softpipe->draw, mode, numVertex, verts, numAttribs, attribs);
+   unmap_surfaces(softpipe);
+}
+
+
+
 static void softpipe_reset_occlusion_counter(struct pipe_context *pipe)
 {
    struct softpipe_context *softpipe = softpipe_context( pipe );
@@ -137,6 +156,7 @@ struct pipe_context *softpipe_create( void )
    softpipe->pipe.set_texture_state = softpipe_set_texture_state;
    softpipe->pipe.set_viewport_state = softpipe_set_viewport_state;
    softpipe->pipe.draw_vb = softpipe_draw_vb;
+   softpipe->pipe.draw_vertices = softpipe_draw_vertices;
    softpipe->pipe.clear = softpipe_clear;
    softpipe->pipe.reset_occlusion_counter = softpipe_reset_occlusion_counter;
    softpipe->pipe.get_occlusion_counter = softpipe_get_occlusion_counter;

src/mesa/state_tracker/st_cb_clear.c

@@ -40,6 +40,51 @@
 #include "st_public.h"
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
+#include "vf/vf.h"
+
+
+/**
+ * Draw a screen-aligned quadrilateral.
+ * Coords are window coords.
+ */
+static void
+draw_quad(GLcontext *ctx,
+          float x0, float y0, float x1, float y1, GLfloat z,
+          const GLfloat color[4])
+{
+   static const GLuint attribs[2] = {
+      VF_ATTRIB_POS,
+      VF_ATTRIB_COLOR0
+   };
+   GLfloat verts[4][2][4]; /* four verts, two attribs, XYZW */
+   GLuint i;
+
+   /* positions */
+   verts[0][0][0] = x0;
+   verts[0][0][1] = y0;
+
+   verts[1][0][0] = x1;
+   verts[1][0][1] = y0;
+
+   verts[2][0][0] = x1;
+   verts[2][0][1] = y1;
+
+   verts[3][0][0] = x0;
+   verts[3][0][1] = y1;
+
+   /* same for all verts: */
+   for (i = 0; i < 4; i++) {
+      verts[i][0][2] = z;
+      verts[i][0][3] = 1.0;
+      verts[i][1][0] = color[0];
+      verts[i][1][1] = color[1];
+      verts[i][1][2] = color[2];
+      verts[i][1][3] = color[3];
+   }
+
+   ctx->st->pipe->draw_vertices(ctx->st->pipe, GL_QUADS,
+                                4, (GLfloat *) verts, 2, attribs);
+}
 
 
 
@@ -48,14 +93,12 @@
  */
 static void
 clear_with_quad(GLcontext *ctx,
-                GLboolean color, GLboolean depth,
-                GLboolean stencil)
+                GLboolean color, GLboolean depth, GLboolean stencil)
 {
    struct st_context *st = ctx->st;
    struct pipe_blend_state blend;
    struct pipe_depth_state depth_test;
    struct pipe_stencil_state stencil_test;
-   GLfloat z = ctx->Depth.Clear;
 
    /* depth state: always pass */
    memset(&depth_test, 0, sizeof(depth));
@@ -96,13 +139,19 @@ clear_with_quad(GLcontext *ctx,
    }
    st->pipe->set_blend_state(st->pipe, &blend);
 
-
-   /*
-    * XXX Render quad here
-    */
+   draw_quad(ctx,
+             ctx->Scissor.X, ctx->Scissor.Y,
+             ctx->Scissor.X + ctx->Scissor.Width,
+             ctx->Scissor.Y + ctx->Scissor.Height,
+             ctx->Depth.Clear, ctx->Color.ClearColor);
 
    /* Restore GL state */
+   st->pipe->set_blend_state(st->pipe, &st->state.blend);
+   st->pipe->set_depth_state(st->pipe, &st->state.depth);
+   st->pipe->set_stencil_state(st->pipe, &st->state.stencil);
+   /* OR:
    st_invalidate_state(ctx, _NEW_COLOR | _NEW_DEPTH | _NEW_STENCIL);
+   */
 }
 
 
@@ -121,7 +170,7 @@ static void st_clear(GLcontext *ctx, GLbitfield mask)
    GLboolean accum = (mask & BUFFER_BIT_ACCUM) ? GL_TRUE : GL_FALSE;
 
    GLboolean maskColor, maskStencil;
-   GLboolean fullscreen = 1;	/* :-) */
+   GLboolean fullscreen = !ctx->Scissor.Enabled;
    GLuint stencilMax = stencil ? (1 << ctx->DrawBuffer->_StencilBuffer->StencilBits) : 0;
 
    /* This makes sure the softpipe has the latest scissor, etc values */
@@ -148,8 +197,6 @@ static void st_clear(GLcontext *ctx, GLbitfield mask)
       assert(!accum);
    }
    else {
-      /* Convert to geometry, etc:
-       */
       clear_with_quad(ctx, color, depth, stencil);
    }
 }