nouveau: nv30: rewrite so we can render only in depth buffer

diff --git a/src/gallium/drivers/nv30/nv30_state_fb.c b/src/gallium/drivers/nv30/nv30_state_fb.c
index 197de82..f90681b 100644 (file)
--- a/src/gallium/drivers/nv30/nv30_state_fb.c
+++ b/src/gallium/drivers/nv30/nv30_state_fb.c
@@ -8,8 +8,8 @@ nv30_state_framebuffer_validate(struct nv30_context *nv30)
        struct nouveau_channel *chan = nv30->screen->base.channel;
        struct nouveau_grobj *rankine = nv30->screen->rankine;
        struct nv04_surface *rt[2], *zeta = NULL;
-       uint32_t rt_enable, rt_format;
-       int i, colour_format = 0, zeta_format = 0;
+       uint32_t rt_enable = 0, rt_format = 0;
+       int i, colour_format = 0, zeta_format = 0, depth_only = 0;
        struct nouveau_stateobj *so = so_new(64, 10);
        unsigned rt_flags = NOUVEAU_BO_RDWR | NOUVEAU_BO_VRAM;
        unsigned w = fb->width;
@@ -17,11 +17,6 @@ nv30_state_framebuffer_validate(struct nv30_context *nv30)
        struct nv30_miptree *nv30mt;
        int colour_bits = 32, zeta_bits = 32;
 
-       if (fb->nr_cbufs == 0) {
-               return FALSE;
-       }
-
-       rt_enable = 0;
        for (i = 0; i < fb->nr_cbufs; i++) {
                if (colour_format) {
                        assert(colour_format == fb->cbufs[i]->format);
@@ -40,17 +35,35 @@ nv30_state_framebuffer_validate(struct nv30_context *nv30)
                zeta = (struct nv04_surface *)fb->zsbuf;
        }
 
-       if (!(rt[0]->base.texture->tex_usage & NOUVEAU_TEXTURE_USAGE_LINEAR)) {
-               assert(!(fb->width & (fb->width - 1)) && !(fb->height & (fb->height - 1)));
-               for (i = 1; i < fb->nr_cbufs; i++)
-                       assert(!(rt[i]->base.texture->tex_usage & NOUVEAU_TEXTURE_USAGE_LINEAR));
+       if (rt_enable & (NV34TCL_RT_ENABLE_COLOR0|NV34TCL_RT_ENABLE_COLOR1)) {
+               /* Render to at least a colour buffer */
+               if (!(rt[0]->base.texture->tex_usage & NOUVEAU_TEXTURE_USAGE_LINEAR)) {
+                       assert(!(fb->width & (fb->width - 1)) && !(fb->height & (fb->height - 1)));
+                       for (i = 1; i < fb->nr_cbufs; i++)
+                               assert(!(rt[i]->base.texture->tex_usage & NOUVEAU_TEXTURE_USAGE_LINEAR));
 
-               rt_format = NV34TCL_RT_FORMAT_TYPE_SWIZZLED |
-                           (log2i(rt[0]->base.width) << NV34TCL_RT_FORMAT_LOG2_WIDTH_SHIFT) |
-                           (log2i(rt[0]->base.height) << NV34TCL_RT_FORMAT_LOG2_HEIGHT_SHIFT);
+                       rt_format = NV34TCL_RT_FORMAT_TYPE_SWIZZLED |
+                               (log2i(rt[0]->base.width) << NV34TCL_RT_FORMAT_LOG2_WIDTH_SHIFT) |
+                               (log2i(rt[0]->base.height) << NV34TCL_RT_FORMAT_LOG2_HEIGHT_SHIFT);
+               }
+               else
+                       rt_format = NV34TCL_RT_FORMAT_TYPE_LINEAR;
+       } else if (fb->zsbuf) {
+               depth_only = 1;
+
+               /* Render to depth buffer only */
+               if (!(zeta->base.texture->tex_usage & NOUVEAU_TEXTURE_USAGE_LINEAR)) {
+                       assert(!(fb->width & (fb->width - 1)) && !(fb->height & (fb->height - 1)));
+
+                       rt_format = NV34TCL_RT_FORMAT_TYPE_SWIZZLED |
+                               (log2i(zeta->base.width) << NV34TCL_RT_FORMAT_LOG2_WIDTH_SHIFT) |
+                               (log2i(zeta->base.height) << NV34TCL_RT_FORMAT_LOG2_HEIGHT_SHIFT);
+               }
+               else
+                       rt_format = NV34TCL_RT_FORMAT_TYPE_LINEAR;
+       } else {
+               return FALSE;
        }
-       else
-               rt_format = NV34TCL_RT_FORMAT_TYPE_LINEAR;
 
        switch (colour_format) {
        case PIPE_FORMAT_A8R8G8B8_UNORM:
@@ -83,21 +96,23 @@ nv30_state_framebuffer_validate(struct nv30_context *nv30)
                return FALSE;
        }
 
-       if (rt_enable & NV34TCL_RT_ENABLE_COLOR0) {
-               uint32_t pitch = rt[0]->pitch;
+       if (depth_only || (rt_enable & NV34TCL_RT_ENABLE_COLOR0)) {
+               struct nv04_surface *rt0 = (depth_only ? zeta : rt[0]);
+               uint32_t pitch = rt0->pitch;
+
                if (zeta) {
                        pitch |= (zeta->pitch << 16);
                } else {
                        pitch |= (pitch << 16);
                }
 
-               nv30mt = (struct nv30_miptree *)rt[0]->base.texture;
+               nv30mt = (struct nv30_miptree *) rt0->base.texture;
                so_method(so, rankine, NV34TCL_DMA_COLOR0, 1);
                so_reloc (so, nouveau_bo(nv30mt->buffer), 0, rt_flags | NOUVEAU_BO_OR,
                              chan->vram->handle, chan->gart->handle);
                so_method(so, rankine, NV34TCL_COLOR0_PITCH, 2);
                so_data  (so, pitch);
-               so_reloc (so, nouveau_bo(nv30mt->buffer), rt[0]->base.offset,
+               so_reloc (so, nouveau_bo(nv30mt->buffer), rt0->base.offset,
                              rt_flags | NOUVEAU_BO_LOW, 0, 0);
        }