checkpoint: implement z/depth testing

8 files changed, 113 insertions, 15 deletions

diff --git a/src/mesa/pipe/softpipe/sp_context.c b/src/mesa/pipe/softpipe/sp_context.c
index 593be0e132..f27d2dd8bc 100644
--- a/src/mesa/pipe/softpipe/sp_context.c
+++ b/src/mesa/pipe/softpipe/sp_context.c
@@ -65,9 +65,11 @@ struct pipe_context *softpipe_create( void )
 
    softpipe->pipe.destroy = softpipe_destroy;
    softpipe->pipe.set_framebuffer_state = softpipe_set_framebuffer_state;
+   softpipe->pipe.set_alpha_test_state = softpipe_set_alpha_test_state;
    softpipe->pipe.set_blend_state = softpipe_set_blend_state;
    softpipe->pipe.set_clip_state = softpipe_set_clip_state;
    softpipe->pipe.set_clear_color_state = softpipe_set_clear_color_state;
+   softpipe->pipe.set_depth_state = softpipe_set_depth_test_state;
    softpipe->pipe.set_point_state = softpipe_set_point_state;
    softpipe->pipe.set_viewport = softpipe_set_viewport;
    softpipe->pipe.set_setup_state = softpipe_set_setup_state;
@@ -87,6 +89,7 @@ struct pipe_context *softpipe_create( void )
    softpipe->prim.cull      = prim_cull( softpipe );
 
    softpipe->quad.blend = sp_quad_blend_stage(softpipe);
+   softpipe->quad.depth_test = sp_quad_depth_test_stage(softpipe);
    softpipe->quad.shade = sp_quad_shade_stage(softpipe);
    softpipe->quad.output = sp_quad_output_stage(softpipe);
 
diff --git a/src/mesa/pipe/softpipe/sp_context.h b/src/mesa/pipe/softpipe/sp_context.h
index ebe39fa8bf..d01fc38b81 100644
--- a/src/mesa/pipe/softpipe/sp_context.h
+++ b/src/mesa/pipe/softpipe/sp_context.h
@@ -80,6 +80,7 @@ struct softpipe_context {
    struct pipe_alpha_test_state alpha_test;
    struct pipe_clip_state   clip;
    struct pipe_clear_color_state   clear_color;
+   struct pipe_depth_state depth_test;
    struct pipe_point_state  point;
    struct pipe_scissor_rect scissor;
    struct pipe_poly_stipple poly_stipple;
diff --git a/src/mesa/pipe/softpipe/sp_quad.c b/src/mesa/pipe/softpipe/sp_quad.c
index 168872c64d..32085ab8c4 100644
--- a/src/mesa/pipe/softpipe/sp_quad.c
+++ b/src/mesa/pipe/softpipe/sp_quad.c
@@ -7,6 +7,7 @@
 void
 sp_build_quad_pipeline(struct softpipe_context *sp)
 {
+   /* build up the pipeline in reverse order... */
 
    sp->quad.first = sp->quad.output;
 
@@ -15,6 +16,11 @@ sp_build_quad_pipeline(struct softpipe_context *sp)
       sp->quad.first = sp->quad.blend;
    }
 
+   if (sp->depth_test.enabled) {
+      sp->quad.depth_test->next = sp->quad.first;
+      sp->quad.first = sp->quad.depth_test;
+   }
+
    /* XXX always enable shader? */
    if (1) {
       sp->quad.shade->next = sp->quad.first;
diff --git a/src/mesa/pipe/softpipe/sp_quad_depth_test.c b/src/mesa/pipe/softpipe/sp_quad_depth_test.c
index 756141db17..76a6ee1bb6 100644
--- a/src/mesa/pipe/softpipe/sp_quad_depth_test.c
+++ b/src/mesa/pipe/softpipe/sp_quad_depth_test.c
@@ -32,29 +32,80 @@
 #include "sp_headers.h"
 #include "sp_surface.h"
 #include "sp_quad.h"
-
+#include "pipe/p_defines.h"
 
 
 static void
 depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
 {
-#if 0
    struct softpipe_context *softpipe = qs->softpipe;
-   GLfloat dest[4][QUAD_SIZE], result[4][QUAD_SIZE];
-   GLuint i;
-
-   /* XXX we're also looping in output_quad() !?! */
-
-   for (i = 0; i < softpipe->framebuffer.num_cbufs; i++) {
-      struct softpipe_surface *sps
-         = softpipe_surface(softpipe->framebuffer.cbufs[i]);
-   
-      sps->read_quad_f_swz(sps, quad->x0, quad->y0, dest);
+   GLuint j;
+   struct softpipe_surface *sps = softpipe_surface(softpipe->framebuffer.zbuf);
+   GLfloat zzzz[QUAD_SIZE];  /**< Z for four pixels in quad */
 
-      /* XXX do blend here */
+#if 0
+   assert(sps); /* shouldn't get here if there's no zbuffer */
+#else
+   if (!sps)
+      return;
+#endif
 
+   /* XXX get zquad from zbuffer */
+   sps->read_quad_z(sps, quad->x0, quad->y0, zzzz);
+
+   switch (softpipe->depth_test.func) {
+   case PIPE_FUNC_NEVER:
+      quad->mask = 0x0;
+      break;
+   case PIPE_FUNC_LESS:
+      for (j = 0; j < QUAD_SIZE; j++) {
+         if (quad->mask & (1 << j)) {
+            if (quad->outputs.depth[j] >= zzzz[j]) {
+               /* fail */
+               quad->mask &= (1 << j);
+            }
+            else if (softpipe->depth_test.writemask) {
+               /* pass, and update Z buffer */
+               zzzz[j] = quad->outputs.depth[j];
+            }
+         }
+      }
+      break;
+   case PIPE_FUNC_EQUAL:
+      for (j = 0; j < QUAD_SIZE; j++) {
+         if (quad->mask & (1 << j)) {
+            if (quad->outputs.depth[j] != zzzz[j]) {
+               /* fail */
+               quad->mask &= (1 << j);
+            }
+            else if (softpipe->depth_test.writemask) {
+               /* pass, and update Z buffer */
+               zzzz[j] = quad->outputs.depth[j];
+            }
+         }
+      }
+      break;
+   case PIPE_FUNC_LEQUAL:
+      for (j = 0; j < QUAD_SIZE; j++) {
+         if (quad->mask & (1 << j)) {
+            if (quad->outputs.depth[j] > zzzz[j]) {
+               /* fail */
+               quad->mask &= (1 << j);
+            }
+            else if (softpipe->depth_test.writemask) {
+               /* pass, and update Z buffer */
+               zzzz[j] = quad->outputs.depth[j];
+            }
+         }
+      }
+      break;
+      /* XXX fill in remaining cases */
+   default:
+      abort();
    }
-#endif
+
+   /* XXX write updated zquad to zbuffer */
+   sps->write_quad_z(sps, quad->x0, quad->y0, zzzz);
 
    qs->next->run(qs->next, quad);
 }
diff --git a/src/mesa/pipe/softpipe/sp_state.h b/src/mesa/pipe/softpipe/sp_state.h
index 5a657c4a8f..6253b9c9e5 100644
--- a/src/mesa/pipe/softpipe/sp_state.h
+++ b/src/mesa/pipe/softpipe/sp_state.h
@@ -38,6 +38,9 @@
 void softpipe_set_framebuffer_state( struct pipe_context *,
 			     const struct pipe_framebuffer_state * );
 
+void softpipe_set_alpha_test_state( struct pipe_context *,
+                                    const struct pipe_alpha_test_state * );
+
 void softpipe_set_blend_state( struct pipe_context *,
                                const struct pipe_blend_state * );
 
@@ -47,6 +50,9 @@ void softpipe_set_clear_color_state( struct pipe_context *,
 void softpipe_set_clip_state( struct pipe_context *,
 			     const struct pipe_clip_state * );
 
+void softpipe_set_depth_test_state( struct pipe_context *,
+                                    const struct pipe_depth_state * );
+
 void softpipe_set_viewport( struct pipe_context *,
 			   const struct pipe_viewport * );
 
diff --git a/src/mesa/pipe/softpipe/sp_state_blend.c b/src/mesa/pipe/softpipe/sp_state_blend.c
index 1fd7a44105..c364d8a319 100644
--- a/src/mesa/pipe/softpipe/sp_state_blend.c
+++ b/src/mesa/pipe/softpipe/sp_state_blend.c
@@ -45,3 +45,29 @@ void softpipe_set_blend_state( struct pipe_context *pipe,
    softpipe->dirty |= G_NEW_BLEND;
 }
 
+
+/** XXX move someday?  Or consolidate all these simple state setters
+ * into one file.
+ */
+void
+softpipe_set_depth_test_state(struct pipe_context *pipe,
+                              const struct pipe_depth_state *depth)
+{
+   struct softpipe_context *softpipe = softpipe_context(pipe);
+
+   softpipe->depth_test = *depth;
+
+   softpipe->dirty |= G_NEW_DEPTH_TEST;
+}
+
+void
+softpipe_set_alpha_test_state(struct pipe_context *pipe,
+                              const struct pipe_alpha_test_state *alpha)
+{
+   struct softpipe_context *softpipe = softpipe_context(pipe);
+
+   softpipe->alpha_test = *alpha;
+
+   softpipe->dirty |= G_NEW_ALPHA_TEST;
+}
+
diff --git a/src/mesa/pipe/softpipe/sp_state_derived.c b/src/mesa/pipe/softpipe/sp_state_derived.c
index 8ab325b72d..5aee4be6b8 100644
--- a/src/mesa/pipe/softpipe/sp_state_derived.c
+++ b/src/mesa/pipe/softpipe/sp_state_derived.c
@@ -134,7 +134,7 @@ void softpipe_update_derived( struct softpipe_context *softpipe )
    if (softpipe->dirty & (G_NEW_SETUP | G_NEW_FS))
       calculate_vertex_layout( softpipe );
 
-   if (softpipe->dirty & (G_NEW_BLEND | G_NEW_FS))
+   if (softpipe->dirty & (G_NEW_BLEND | G_NEW_DEPTH_TEST | G_NEW_ALPHA_TEST | G_NEW_FS))
       sp_build_quad_pipeline(softpipe);
 
    softpipe->dirty = 0;
diff --git a/src/mesa/pipe/softpipe/sp_surface.h b/src/mesa/pipe/softpipe/sp_surface.h
index fc9557dee3..05b125d17b 100644
--- a/src/mesa/pipe/softpipe/sp_surface.h
+++ b/src/mesa/pipe/softpipe/sp_surface.h
@@ -77,6 +77,11 @@ struct softpipe_surface {
    void (*write_mono_row_ub)( struct softpipe_surface *,
                               GLuint count, GLint x, GLint y,
                               GLubyte rgba[NUM_CHANNELS] );
+
+   void (*read_quad_z)(struct softpipe_surface *,
+                       GLint x, GLint y, GLfloat zzzz[QUAD_SIZE]);
+   void (*write_quad_z)(struct softpipe_surface *,
+                        GLint x, GLint y, const GLfloat zzzz[QUAD_SIZE]);
 };