r300g: There is no such thing as "texture stride"

Individual texture images have a stride, but textures as a whole do not.

There are still pieces of code which are confused about this, but the core of
the confusion is hopefully gone.

Signed-off-by: Nicolai Hähnle <nhaehnle@gmail.com>

src/gallium/drivers/r300/r300_context.h

@@ -184,8 +184,15 @@ struct r300_texture {
     /* Offsets into the buffer. */
     unsigned offset[PIPE_MAX_TEXTURE_LEVELS];
 
-    /* Stride (pitch?) of this texture in bytes */
+    /**
-    unsigned stride;
+     * If non-zero, override the natural texture layout with
+     * a custom stride (in bytes).
+     *
+     * \note Mipmapping fails for textures with a non-natural layout!
+     *
+     * \sa r300_texture_get_stride
+     */
+    unsigned stride_override;
 
     /* Total size of this texture, in bytes. */
     unsigned size;

src/gallium/drivers/r300/r300_emit.c

@@ -283,7 +283,7 @@ void r300_emit_fb_state(struct r300_context* r300,
     for (i = 0; i < fb->nr_cbufs; i++) {
         tex = (struct r300_texture*)fb->cbufs[i]->texture;
         assert(tex && tex->buffer && "cbuf is marked, but NULL!");
-        pixpitch = tex->stride / tex->tex.block.size;
+        pixpitch = r300_texture_get_stride(tex, 0) / tex->tex.block.size;
 
         OUT_CS_REG_SEQ(R300_RB3D_COLOROFFSET0 + (4 * i), 1);
         OUT_CS_RELOC(tex->buffer, 0, 0, RADEON_GEM_DOMAIN_VRAM, 0);
@@ -300,7 +300,7 @@ void r300_emit_fb_state(struct r300_context* r300,
     if (fb->zsbuf) {
         tex = (struct r300_texture*)fb->zsbuf->texture;
         assert(tex && tex->buffer && "zsbuf is marked, but NULL!");
-        pixpitch = tex->stride / tex->tex.block.size;
+        pixpitch = r300_texture_get_stride(tex, 0) / tex->tex.block.size;
 
         OUT_CS_REG_SEQ(R300_ZB_DEPTHOFFSET, 1);
         OUT_CS_RELOC(tex->buffer, 0, 0, RADEON_GEM_DOMAIN_VRAM, 0);

src/gallium/drivers/r300/r300_screen.c

@@ -323,13 +323,14 @@ r300_get_tex_transfer(struct pipe_screen *screen,
     if (trans) {
         pipe_texture_reference(&trans->transfer.texture, texture);
         trans->transfer.format = texture->format;
+        trans->transfer.x = x;
+        trans->transfer.y = y;
         trans->transfer.width = w;
         trans->transfer.height = h;
         trans->transfer.block = texture->block;
         trans->transfer.nblocksx = texture->nblocksx[level];
         trans->transfer.nblocksy = texture->nblocksy[level];
-        trans->transfer.stride = align(pf_get_stride(&trans->transfer.block,
+        trans->transfer.stride = r300_texture_get_stride(tex, level);
-                                                     texture->width[level]), 32);
         trans->transfer.usage = usage;
         trans->offset = offset;
     }

src/gallium/drivers/r300/r300_surface.c

@@ -29,7 +29,7 @@ static void r300_surface_setup(struct r300_context* r300,
                                unsigned w, unsigned h)
 {
     struct r300_capabilities* caps = r300_screen(r300->context.screen)->caps;
-    unsigned pixpitch = dest->stride / dest->tex.block.size;
+    unsigned pixpitch = r300_texture_get_stride(dest, 0) / dest->tex.block.size;
     CS_LOCALS(r300);
 
     r300_emit_blend_state(r300, &blend_clear_state);
@@ -100,7 +100,7 @@ static void r300_surface_fill(struct pipe_context* pipe,
     struct r300_context* r300 = r300_context(pipe);
     struct r300_capabilities* caps = r300_screen(pipe->screen)->caps;
     struct r300_texture* tex = (struct r300_texture*)dest->texture;
-    unsigned pixpitch = tex->stride / tex->tex.block.size;
+    unsigned pixpitch = r300_texture_get_stride(tex, 0) / tex->tex.block.size;
     boolean invalid = FALSE;
     CS_LOCALS(r300);
 
@@ -233,7 +233,7 @@ static void r300_surface_copy(struct pipe_context* pipe,
     struct r300_capabilities* caps = r300_screen(pipe->screen)->caps;
     struct r300_texture* srctex = (struct r300_texture*)src->texture;
     struct r300_texture* desttex = (struct r300_texture*)dest->texture;
-    unsigned pixpitch = srctex->stride / srctex->tex.block.size;
+    unsigned pixpitch = r300_texture_get_stride(srctex, 0) / srctex->tex.block.size;
     boolean invalid = FALSE;
     float fsrcx = srcx, fsrcy = srcy, fdestx = destx, fdesty = desty;
     CS_LOCALS(r300);

src/gallium/drivers/r300/r300_texture.c

@@ -25,7 +25,6 @@
 static void r300_setup_texture_state(struct r300_texture* tex,
                                      unsigned width,
                                      unsigned height,
-                                     unsigned pitch,
                                      unsigned levels)
 {
     struct r300_texture_state* state = &tex->state;
@@ -38,7 +37,7 @@ static void r300_setup_texture_state(struct r300_texture* tex,
     /* XXX */
     state->format1 = r300_translate_texformat(tex->tex.format);
 
-    state->format2 = pitch - 1;
+    state->format2 = r300_texture_get_stride(tex, 0);
 
     /* Assume (somewhat foolishly) that oversized textures will
      * not be permitted by the state tracker. */
@@ -50,13 +49,30 @@ static void r300_setup_texture_state(struct r300_texture* tex,
     }
 
     debug_printf("r300: Set texture state (%dx%d, pitch %d, %d levels)\n",
-            width, height, pitch, levels);
+            width, height, levels);
+}
+
+/**
+ * Return the stride, in bytes, of the texture images of the given texture
+ * at the given level.
+ */
+unsigned r300_texture_get_stride(struct r300_texture* tex, unsigned level)
+{
+    if (tex->stride_override)
+        return tex->stride_override;
+
+    if (level > tex->tex.last_level) {
+        debug_printf("%s: level (%u) > last_level (%u)\n", level, tex->tex.last_level);
+        return 0;
+    }
+
+    return align(pf_get_stride(&tex->tex.block, tex->tex.width[level]), 32);
 }
 
 static void r300_setup_miptree(struct r300_texture* tex)
 {
     struct pipe_texture* base = &tex->tex;
-    int stride, size, offset;
+    int stride, size;
     int i;
 
     for (i = 0; i <= base->last_level; i++) {
@@ -74,7 +90,7 @@ static void r300_setup_miptree(struct r300_texture* tex)
          * XXX
          * POT, uncompressed, unmippmapped textures can be aligned to 32,
          * instead of 64. */
-        stride = align(pf_get_stride(&base->block, base->width[i]), 32);
+        stride = r300_texture_get_stride(tex, i);
         size = stride * base->nblocksy[i] * base->depth[i];
 
         tex->offset[i] = align(tex->size, 32);
@@ -84,10 +100,6 @@ static void r300_setup_miptree(struct r300_texture* tex)
                 "(%dx%dx%d px, pitch %d bytes)\n",
                 i, base->width[i], base->height[i], base->depth[i],
                 stride);
-        /* Save stride of first level to the texture. */
-        if (i == 0) {
-            tex->stride = stride;
-        }
     }
 }
 
@@ -109,7 +121,7 @@ static struct pipe_texture*
     r300_setup_miptree(tex);
 
     r300_setup_texture_state(tex, template->width[0], template->height[0],
-            template->width[0], template->last_level);
+                             template->last_level);
 
     tex->buffer = screen->buffer_create(screen, 1024,
                                         PIPE_BUFFER_USAGE_PIXEL,
@@ -189,11 +201,10 @@ static struct pipe_texture*
     pipe_reference_init(&tex->tex.reference, 1);
     tex->tex.screen = screen;
 
-    tex->stride = *stride;
+    tex->stride_override = *stride;
 
     /* XXX */
-    r300_setup_texture_state(tex, tex->tex.width[0], tex->tex.height[0],
+    r300_setup_texture_state(tex, tex->tex.width[0], tex->tex.height[0], 0);
-            tex->stride, 0);
 
     pipe_buffer_reference(&tex->buffer, buffer);
 
@@ -221,7 +232,7 @@ boolean r300_get_texture_buffer(struct pipe_texture* texture,
     pipe_buffer_reference(buffer, tex->buffer);
 
     if (stride) {
-        *stride = tex->stride;
+        *stride = r300_texture_get_stride(tex, 0);
     }
 
     return TRUE;

src/gallium/drivers/r300/r300_texture.h

@@ -30,8 +30,12 @@
 #include "r300_context.h"
 #include "r300_reg.h"
 
+struct r300_texture;
+
 void r300_init_screen_texture_functions(struct pipe_screen* screen);
 
+unsigned r300_texture_get_stride(struct r300_texture* tex, unsigned level);
+
 /* Note the signature of R300_EASY_TX_FORMAT(A, R, G, B, FORMAT)... */
 static INLINE uint32_t r300_translate_texformat(enum pipe_format format)
 {