Implement rendering to textures for any mipmap level, any cube face, any

3D texture slice.
Added draw_offset to intel_region struct.

src/mesa/drivers/dri/i915/i915_vtbl.c

@@ -247,12 +247,14 @@ static void i915_emit_state( struct intel_context *intel )
       BEGIN_BATCH(I915_DEST_SETUP_SIZE+2, 0);
       OUT_BATCH(state->Buffer[I915_DESTREG_CBUFADDR0]);
       OUT_BATCH(state->Buffer[I915_DESTREG_CBUFADDR1]);
-      OUT_RELOC(state->draw_region->buffer, DRM_MM_TT|DRM_MM_WRITE, 0);
+      OUT_RELOC(state->draw_region->buffer, DRM_MM_TT|DRM_MM_WRITE,
+                state->draw_region->draw_offset);
 
       if (state->depth_region) {
          OUT_BATCH(state->Buffer[I915_DESTREG_DBUFADDR0]);
          OUT_BATCH(state->Buffer[I915_DESTREG_DBUFADDR1]);
-         OUT_RELOC(state->depth_region->buffer, DRM_MM_TT|DRM_MM_WRITE, 0);
+         OUT_RELOC(state->depth_region->buffer, DRM_MM_TT|DRM_MM_WRITE,
+                   state->depth_region->draw_offset);
       }
 
       OUT_BATCH(state->Buffer[I915_DESTREG_DV0]);

src/mesa/drivers/dri/i915/intel_blit.c

@@ -420,7 +420,8 @@ void intelClearWithBlit(GLcontext *ctx, GLbitfield mask, GLboolean all,
                OUT_BATCH( BR13 );
                OUT_BATCH( (b.y1 << 16) | b.x1 );
                OUT_BATCH( (b.y2 << 16) | b.x2 );
-               OUT_RELOC( irb->region->buffer, DRM_MM_TT|DRM_MM_WRITE, 0 );
+               OUT_RELOC( irb->region->buffer, DRM_MM_TT|DRM_MM_WRITE,
+                          irb->region->draw_offset );
                OUT_BATCH( clearVal );
                ADVANCE_BATCH();
                clearMask &= ~bufBit; /* turn off bit, for faster loop exit */

src/mesa/drivers/dri/i915/intel_fbo.c

@@ -470,8 +470,10 @@ intel_framebuffer_renderbuffer(GLcontext *ctx,
                                GLenum attachment,
                                struct gl_renderbuffer *rb)
 {
+   /*
    _mesa_debug(ctx, "Intel FramebufferRenderbuffer %u %u\n",
                fb->Name, rb ? rb->Name : 0);
+   */
 
    intelFlush(ctx);
 
@@ -488,7 +490,7 @@ intel_framebuffer_renderbuffer(GLcontext *ctx,
 static struct intel_renderbuffer *
 intel_wrap_texture(GLcontext *ctx, struct gl_texture_image *texImage)
 {
-   const GLuint name = ~0; /* XXX OK? */
+   const GLuint name = ~0; /* not significant, but distinct for debugging */
    struct intel_renderbuffer *irb;
 
    /* make an intel_renderbuffer to wrap the texture image */
@@ -553,11 +555,10 @@ intel_renderbuffer_texture(GLcontext *ctx,
 {
    struct gl_texture_image *newImage
       = att->Texture->Image[att->CubeMapFace][att->TextureLevel];
-
    struct intel_renderbuffer *irb
       = intel_renderbuffer(att->Renderbuffer);
-
    struct intel_texture_image *intel_image;
+   GLuint imageOffset;
 
    (void) fb;
 
@@ -565,33 +566,45 @@ intel_renderbuffer_texture(GLcontext *ctx,
 
    if (!irb) {
       irb = intel_wrap_texture(ctx, newImage);
+      if (irb) {
+         /* bind the wrapper to the attachment point */
+         att->Renderbuffer = &irb->Base;
+      }
+      else {
+         /* fallback to software rendering */
+         _mesa_problem(ctx, "Render to texture - unsupported hw format");
+         _mesa_renderbuffer_texture(ctx, fb, att);
+         /* XXX FBO: Need to map the buffer (or in intelSpanRenderStart???) */
+         return;
+      }
    }
 
-   if (irb) {
-      /* hardware rendering to texture */
-      irb->Base.RefCount++;
+   /*
+   _mesa_debug(ctx, "Begin render texture tex=%u w=%d h=%d refcount=%d\n",
+               att->Texture->Name, newImage->Width, newImage->Height,
+               irb->Base.RefCount);
+   */
 
-      /*
-      _mesa_debug(ctx, "Begin render texture (tid %u) tex %u\n",
-                  _glthread_GetID(), att->Texture->Name);
-      */
+   /* point the renderbufer's region to the texture image region */
+   intel_image = intel_texture_image(newImage);
+   if (irb->region != intel_image->mt->region)
+      intel_region_reference(&irb->region, intel_image->mt->region);
 
-      /* hook into the region */
-      /* XXX mipmap level / cube face */
-      intel_image = intel_texture_image(newImage);
-      if (irb->region != intel_image->mt->region)
-         intel_region_reference(&irb->region, intel_image->mt->region);
-
-      att->Renderbuffer = &irb->Base;
-
-      intel_draw_buffer(ctx, fb);
-   }
-   else {
-      /* fallback to software rendering */
-      _mesa_problem(ctx, "Render to texture - unsupported hw format");
-      _mesa_renderbuffer_texture(ctx, fb, att);
-      /* XXX FBO: Need to map the buffer (or in intelSpanRenderStart???) */
+   /* compute offset of the particular 2D image within the texture region */
+   imageOffset = intel_miptree_image_offset(intel_image->mt,
+                                            att->CubeMapFace,
+                                            att->TextureLevel);
+   if (att->Texture->Target == GL_TEXTURE_3D) {
+      GLuint imgStride = intel_miptree_depth_image_stride(intel_image->mt,
+                                                          att->CubeMapFace,
+                                                          att->TextureLevel);
+      imageOffset += imgStride * att->Zoffset;
    }
+   /* store that offset in the region */
+   intel_image->mt->region->draw_offset = imageOffset;
+
+   /* update drawing region, etc */
+   intel_draw_buffer(ctx, fb);
 }
 
 
@@ -612,21 +625,11 @@ intel_finish_render_texture(GLcontext *ctx,
    */
 
    if (irb) {
-      /* hardware */
+      /* just release the region */
       intel_region_release(intel, &irb->region);
-
-      irb->Base.RefCount--;
-
-      /*
-      _mesa_debug(ctx, "intel_finish_render_texture, refcount=%d\n",
-                  irb->Base.RefCount);
-      */
-
-      /* should never hit zero here */
-      assert(irb->Base.RefCount > 0);
    }
-   else {
-      /* software */
+   else if (att->Renderbuffer) {
+      /* software fallback */
       _mesa_finish_render_texture(ctx, att);
       /* XXX FBO: Need to unmap the buffer (or in intelSpanRenderStart???) */
    }

src/mesa/drivers/dri/i915/intel_regions.h

@@ -41,15 +41,18 @@ struct intel_context;
  * - Blitter commands for copying 2D regions between buffers. (really???)
  */
 struct intel_region {
-   GLuint buffer; /* buffer manager's buffer ID */
-   GLuint refcount;
-   GLuint cpp;    /* bytes per pixel */
-   GLuint pitch;  /* in pixels */
-   GLuint height; /* in pixels */
-   GLubyte *map;  /* only non-NULL when region is actually mapped */
-   GLuint map_refcount;
+   GLuint buffer;   /**< buffer manager's buffer ID */
+   GLuint refcount; /**< Reference count for region */
+   GLuint cpp;      /**< bytes per pixel */
+   GLuint pitch;    /**< in pixels */
+   GLuint height;   /**< in pixels */
+   GLubyte *map;    /**< only non-NULL when region is actually mapped */
+   GLuint map_refcount;  /**< Reference count for mapping */
+
+   GLuint draw_offset; /**< Offset of drawing address within the region */
 };
 
+
 /* Allocate a refcounted region.  Pointers to regions should only be
  * copied by calling intel_reference_region().
  */