intel: Implement the DRI2 invalidate function properly

This uses a stamp mechanisms to mark the DRI drawable as invalid.
Instead of immediately updating the buffers we just bump the drawable
stamp and call out to DRI2GetBuffers "later".

"Later" used to be at LOCK_HARDWARE time, and this patch brings back
callouts at the points where we used to call LOCK_HARDWARE.  A new function,
intel_prepare_render(), is called where we used to call LOCK_HARDWARE,
and if the buffers are invalid, we call out to DRI2GetBuffers there.

This lets us invalidate buffers only when notified instead of on
every glViewport() call.  If the loader calls the DRI invalidate
entrypoint, we disable viewport triggered buffer invalidation.

Additionally, we can clean up the old viewport mechanism a bit,
since we can just invalidate the buffers and not worry about
reentrancy and whatnot.

16 files changed, 79 insertions, 48 deletions

diff --git a/src/mesa/drivers/dri/common/dri_util.c b/src/mesa/drivers/dri/common/dri_util.c
index b891fca2b1..58a94b5868 100644
--- a/src/mesa/drivers/dri/common/dri_util.c
+++ b/src/mesa/drivers/dri/common/dri_util.c
@@ -585,6 +585,8 @@ driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,
     pcp->driDrawablePriv = NULL;
     pcp->loaderPrivate = data;
     
+    pcp->dri2.draw_stamp = 0;
+    pcp->dri2.read_stamp = 0;
     /* When the first context is created for a screen, initialize a "dummy"
      * context.
      */
diff --git a/src/mesa/drivers/dri/common/dri_util.h b/src/mesa/drivers/dri/common/dri_util.h
index 8f0cd4cf9d..2eadb9ac8c 100644
--- a/src/mesa/drivers/dri/common/dri_util.h
+++ b/src/mesa/drivers/dri/common/dri_util.h
@@ -422,6 +422,11 @@ struct __DRIcontextRec {
      * The loaders's private context data.  This structure is opaque.
      */
     void *loaderPrivate;
+
+    struct {
+	int draw_stamp;
+	int read_stamp;
+    } dri2;
 };
 
 /**
diff --git a/src/mesa/drivers/dri/i965/brw_draw.c b/src/mesa/drivers/dri/i965/brw_draw.c
index d510d767f9..976249091e 100644
--- a/src/mesa/drivers/dri/i965/brw_draw.c
+++ b/src/mesa/drivers/dri/i965/brw_draw.c
@@ -337,6 +337,8 @@ static GLboolean brw_try_draw_prims( GLcontext *ctx,
     * so can't access it earlier.
     */
 
+   intel_prepare_render(intel);
+
    for (i = 0; i < nr_prims; i++) {
       uint32_t hw_prim;
 
diff --git a/src/mesa/drivers/dri/intel/intel_blit.c b/src/mesa/drivers/dri/intel/intel_blit.c
index 1fd07e8b82..5a60a17500 100644
--- a/src/mesa/drivers/dri/intel/intel_blit.c
+++ b/src/mesa/drivers/dri/intel/intel_blit.c
@@ -115,6 +115,8 @@ intelEmitCopyBlit(struct intel_context *intel,
            break;
    } while (pass < 2);
 
+   intel_prepare_render(intel);
+
    if (pass >= 2) {
        dri_bo_map(dst_buffer, GL_TRUE);
        dri_bo_map(src_buffer, GL_FALSE);
@@ -241,6 +243,8 @@ intelClearWithBlit(GLcontext *ctx, GLbitfield mask)
    GLuint buf;
    all = (cw == fb->Width && ch == fb->Height);
 
+   intel_prepare_render(intel);
+
    /* Loop over all renderbuffers */
    for (buf = 0; buf < BUFFER_COUNT && mask; buf++) {
       const GLbitfield bufBit = 1 << buf;
diff --git a/src/mesa/drivers/dri/intel/intel_buffers.c b/src/mesa/drivers/dri/intel/intel_buffers.c
index 2f03e45005..b10693050a 100644
--- a/src/mesa/drivers/dri/intel/intel_buffers.c
+++ b/src/mesa/drivers/dri/intel/intel_buffers.c
@@ -271,13 +271,12 @@ intelDrawBuffer(GLcontext * ctx, GLenum mode)
       intel->is_front_buffer_rendering = (mode == GL_FRONT_LEFT)
 	|| (mode == GL_FRONT);
 
-      /* If we weren't front-buffer rendering before but we are now, make sure
-       * that the front-buffer has actually been allocated.
+      /* If we weren't front-buffer rendering before but we are now,
+       * invalidate our DRI drawable so we'll ask for new buffers
+       * (including the fake front) before we start rendering again.
        */
-      if (!was_front_buffer_rendering && intel->is_front_buffer_rendering) {
-	 intel_update_renderbuffers(intel->driContext,
-				    intel->driContext->driDrawablePriv);
-      }
+      if (!was_front_buffer_rendering && intel->is_front_buffer_rendering)
+	 dri2InvalidateDrawable(intel->driContext->driDrawablePriv);
    }
 
    intel_draw_buffer(ctx, ctx->DrawBuffer);
@@ -295,13 +294,12 @@ intelReadBuffer(GLcontext * ctx, GLenum mode)
       intel->is_front_buffer_reading = (mode == GL_FRONT_LEFT)
 	|| (mode == GL_FRONT);
 
-      /* If we weren't front-buffer reading before but we are now, make sure
-       * that the front-buffer has actually been allocated.
+      /* If we weren't front-buffer reading before but we are now,
+       * invalidate our DRI drawable so we'll ask for new buffers
+       * (including the fake front) before we start reading again.
        */
-      if (!was_front_buffer_reading && intel->is_front_buffer_reading) {
-	 intel_update_renderbuffers(intel->driContext,
-				    intel->driContext->driDrawablePriv);
-      }
+      if (!was_front_buffer_reading && intel->is_front_buffer_reading)
+	 dri2InvalidateDrawable(intel->driContext->driReadablePriv);
    }
 
    if (ctx->ReadBuffer == ctx->DrawBuffer) {
diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index 81d5a32476..8f37fb82c1 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -197,6 +197,15 @@ intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
    unsigned int attachments[10];
    const char *region_name;
 
+   /* If we're rendering to the fake front buffer, make sure all the
+    * pending drawing has landed on the real front buffer.  Otherwise
+    * when we eventually get to DRI2GetBuffersWithFormat the stale
+    * real front buffer contents will get copied to the new fake front
+    * buffer.
+    */
+   if (intel->is_front_buffer_rendering)
+      intel_flush(&intel->ctx, GL_FALSE);
+
    if (INTEL_DEBUG & DEBUG_DRI)
       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
 
@@ -371,36 +380,40 @@ intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
 }
 
 void
+intel_prepare_render(struct intel_context *intel)
+{
+   __DRIcontext *driContext = intel->driContext;
+   __DRIdrawable *drawable;
+
+   drawable = intel->driDrawable;
+   if (drawable->dri2.stamp != driContext->dri2.draw_stamp) {
+      if (drawable->lastStamp != drawable->dri2.stamp)
+	 intel_update_renderbuffers(driContext, drawable);
+      intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
+      driContext->dri2.draw_stamp = drawable->dri2.stamp;
+   }
+
+   drawable = intel->driReadDrawable;
+   if (drawable->dri2.stamp != driContext->dri2.read_stamp) {
+      if (drawable->lastStamp != drawable->dri2.stamp)
+	 intel_update_renderbuffers(driContext, drawable);
+      driContext->dri2.read_stamp = drawable->dri2.stamp;
+   }
+}
+
+void
 intel_viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 {
     struct intel_context *intel = intel_context(ctx);
     __DRIcontext *driContext = intel->driContext;
-    void (*old_viewport)(GLcontext *ctx, GLint x, GLint y,
-			 GLsizei w, GLsizei h);
-
-    if (!intel->meta.internal_viewport_call && ctx->DrawBuffer->Name == 0) {
-       /* If we're rendering to the fake front buffer, make sure all the pending
-	* drawing has landed on the real front buffer.  Otherwise when we
-	* eventually get to DRI2GetBuffersWithFormat the stale real front
-	* buffer contents will get copied to the new fake front buffer.
-	*/
-       if (intel->is_front_buffer_rendering) {
-	  intel_flush(ctx, GL_FALSE);
-       }
 
-       intel_update_renderbuffers(driContext, driContext->driDrawablePriv);
-       if (driContext->driDrawablePriv != driContext->driReadablePriv)
-	  intel_update_renderbuffers(driContext, driContext->driReadablePriv);
+    if (!intel->using_dri2_swapbuffers &&
+	!intel->meta.internal_viewport_call && ctx->DrawBuffer->Name == 0) {
+       dri2InvalidateDrawable(driContext->driDrawablePriv);
+       dri2InvalidateDrawable(driContext->driReadablePriv);
     }
-
-    old_viewport = ctx->Driver.Viewport;
-    ctx->Driver.Viewport = NULL;
-    intel->driDrawable = driContext->driDrawablePriv;
-    intel_draw_buffer(ctx, intel->ctx.DrawBuffer);
-    ctx->Driver.Viewport = old_viewport;
 }
 
-
 static const struct dri_debug_control debug_control[] = {
    { "tex",   DEBUG_TEXTURE},
    { "state", DEBUG_STATE},
@@ -860,22 +873,12 @@ intelMakeCurrent(__DRIcontext * driContextPriv,
    if (driContextPriv) {
       struct gl_framebuffer *fb = driDrawPriv->driverPrivate;
       struct gl_framebuffer *readFb = driReadPriv->driverPrivate;
- 
-      intel_update_renderbuffers(driContextPriv, driDrawPriv);
-      if (driDrawPriv != driReadPriv)
-	 intel_update_renderbuffers(driContextPriv, driReadPriv);
-
-      /* set GLframebuffer size to match window, if needed */
-      driUpdateFramebufferSize(&intel->ctx, driDrawPriv);
-
-      if (driReadPriv != driDrawPriv) {
-	 driUpdateFramebufferSize(&intel->ctx, driReadPriv);
-      }
 
       _mesa_make_current(&intel->ctx, fb, readFb);
       intel->driReadDrawable = driReadPriv;
       intel->driDrawable = driDrawPriv;
-      intel_draw_buffer(&intel->ctx, fb);
+      driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
+      driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
    }
    else {
       _mesa_make_current(NULL, NULL, NULL);
diff --git a/src/mesa/drivers/dri/intel/intel_context.h b/src/mesa/drivers/dri/intel/intel_context.h
index 0f0a194b3f..da5d901abf 100644
--- a/src/mesa/drivers/dri/intel/intel_context.h
+++ b/src/mesa/drivers/dri/intel/intel_context.h
@@ -454,6 +454,7 @@ void intel_viewport(GLcontext * ctx, GLint x, GLint y,
 
 void intel_update_renderbuffers(__DRIcontext *context,
 				__DRIdrawable *drawable);
+void intel_prepare_render(struct intel_context *intel);
 
 void i915_set_buf_info_for_region(uint32_t *state, struct intel_region *region,
 				  uint32_t buffer_id);
diff --git a/src/mesa/drivers/dri/intel/intel_pixel_bitmap.c b/src/mesa/drivers/dri/intel/intel_pixel_bitmap.c
index 1e517650b7..eabfbf4af9 100644
--- a/src/mesa/drivers/dri/intel/intel_pixel_bitmap.c
+++ b/src/mesa/drivers/dri/intel/intel_pixel_bitmap.c
@@ -234,6 +234,8 @@ do_blit_bitmap( GLcontext *ctx,
    if (!intel_check_blit_fragment_ops(ctx, tmpColor[3] == 1.0F))
       return GL_FALSE;
 
+   intel_prepare_render(intel);
+
    /* Clip to buffer bounds and scissor. */
    if (!_mesa_clip_to_region(fb->_Xmin, fb->_Ymin,
 			     fb->_Xmax, fb->_Ymax,
diff --git a/src/mesa/drivers/dri/intel/intel_pixel_copy.c b/src/mesa/drivers/dri/intel/intel_pixel_copy.c
index 87c293d8b0..f4f3fd6d88 100644
--- a/src/mesa/drivers/dri/intel/intel_pixel_copy.c
+++ b/src/mesa/drivers/dri/intel/intel_pixel_copy.c
@@ -138,6 +138,8 @@ do_blit_copypixels(GLcontext * ctx,
 
    intelFlush(&intel->ctx);
 
+   intel_prepare_render(intel);
+
    /* XXX: We fail to handle different inversion between read and draw framebuffer. */
 
    /* Clip to destination buffer. */
diff --git a/src/mesa/drivers/dri/intel/intel_pixel_read.c b/src/mesa/drivers/dri/intel/intel_pixel_read.c
index a98e8e16c2..514a17e2aa 100644
--- a/src/mesa/drivers/dri/intel/intel_pixel_read.c
+++ b/src/mesa/drivers/dri/intel/intel_pixel_read.c
@@ -132,6 +132,8 @@ do_blit_readpixels(GLcontext * ctx,
       return GL_TRUE;
    }
 
+   intel_prepare_render(intel);
+
    all = (width * height * src->cpp == dst->Base.Size &&
 	  x == 0 && dst_offset == 0);
 
@@ -172,6 +174,7 @@ intelReadPixels(GLcontext * ctx,
       fprintf(stderr, "%s\n", __FUNCTION__);
 
    intelFlush(ctx);
+   intel_prepare_render(intel_context(ctx));
 
    if (do_blit_readpixels
        (ctx, x, y, width, height, format, type, pack, pixels))
diff --git a/src/mesa/drivers/dri/intel/intel_regions.c b/src/mesa/drivers/dri/intel/intel_regions.c
index 881653ff01..62b4ce61e4 100644
--- a/src/mesa/drivers/dri/intel/intel_regions.c
+++ b/src/mesa/drivers/dri/intel/intel_regions.c
@@ -378,6 +378,8 @@ intel_region_data(struct intel_context *intel,
          intel_region_cow(intel, dst);
    }
 
+   intel_prepare_render(intel);
+
    _mesa_copy_rect(intel_region_map(intel, dst) + dst_offset,
                    dst->cpp,
                    dst->pitch,
@@ -500,6 +502,7 @@ intel_region_cow(struct intel_context *intel, struct intel_region *region)
    /* Now blit from the texture buffer to the new buffer: 
     */
 
+   intel_prepare_render(intel);
    ok = intelEmitCopyBlit(intel,
                           region->cpp,
                           region->pitch, pbo->buffer, 0, region->tiling,
diff --git a/src/mesa/drivers/dri/intel/intel_screen.c b/src/mesa/drivers/dri/intel/intel_screen.c
index 8eed8ee737..5e23aa8a1d 100644
--- a/src/mesa/drivers/dri/intel/intel_screen.c
+++ b/src/mesa/drivers/dri/intel/intel_screen.c
@@ -129,7 +129,6 @@ intelDRI2Invalidate(__DRIdrawable *drawable)
 
    intel->using_dri2_swapbuffers = GL_TRUE;
    dri2InvalidateDrawable(drawable);
-   intel_update_renderbuffers(intel->driContext, drawable);
 }
 
 static const struct __DRI2flushExtensionRec intelFlushExtension = {
diff --git a/src/mesa/drivers/dri/intel/intel_span.c b/src/mesa/drivers/dri/intel/intel_span.c
index d925cb9997..97bb97265f 100644
--- a/src/mesa/drivers/dri/intel/intel_span.c
+++ b/src/mesa/drivers/dri/intel/intel_span.c
@@ -498,6 +498,7 @@ intelSpanRenderStart(GLcontext * ctx)
    GLuint i;
 
    intelFlush(&intel->ctx);
+   intel_prepare_render(intel);
 
    for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
       if (ctx->Texture.Unit[i]._ReallyEnabled) {
diff --git a/src/mesa/drivers/dri/intel/intel_tex_copy.c b/src/mesa/drivers/dri/intel/intel_tex_copy.c
index d67451cf8e..13b8bcfa86 100644
--- a/src/mesa/drivers/dri/intel/intel_tex_copy.c
+++ b/src/mesa/drivers/dri/intel/intel_tex_copy.c
@@ -109,6 +109,7 @@ do_copy_texsubimage(struct intel_context *intel,
    }
 
    /* intelFlush(ctx); */
+   intel_prepare_render(intel);
    {
       drm_intel_bo *dst_bo = intel_region_buffer(intel,
 						 intelImage->mt->region,
diff --git a/src/mesa/drivers/dri/intel/intel_tex_image.c b/src/mesa/drivers/dri/intel/intel_tex_image.c
index bc4e5c6136..aefd0b97d0 100644
--- a/src/mesa/drivers/dri/intel/intel_tex_image.c
+++ b/src/mesa/drivers/dri/intel/intel_tex_image.c
@@ -240,6 +240,7 @@ try_pbo_upload(struct intel_context *intel,
 
    if (drm_intel_bo_references(intel->batch->buf, dst_buffer))
       intelFlush(&intel->ctx);
+   intel_prepare_render(intel);
    {
       dri_bo *src_buffer = intel_bufferobj_buffer(intel, pbo, INTEL_READ);
 
@@ -472,6 +473,8 @@ intelTexImage(GLcontext * ctx,
 					   pixels, unpack, "glTexImage");
    }
 
+   intel_prepare_render(intel);
+
    if (intelImage->mt) {
       if (pixels != NULL) {
 	 /* Flush any queued rendering with the texture before mapping. */
@@ -748,7 +751,7 @@ intelSetTexBuffer2(__DRIcontext *pDRICtx, GLint target,
    if (!intelObj)
       return;
 
-   if (dPriv->lastStamp != *dPriv->pStamp)
+   if (dPriv->lastStamp != dPriv->dri2.stamp)
       intel_update_renderbuffers(pDRICtx, dPriv);
 
    rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
diff --git a/src/mesa/drivers/dri/intel/intel_tex_subimage.c b/src/mesa/drivers/dri/intel/intel_tex_subimage.c
index 7f1dc89022..c35d2e8757 100644
--- a/src/mesa/drivers/dri/intel/intel_tex_subimage.c
+++ b/src/mesa/drivers/dri/intel/intel_tex_subimage.c
@@ -72,6 +72,8 @@ intelTexSubimage(GLcontext * ctx,
    if (!pixels)
       return;
 
+   intel_prepare_render(intel);
+
    /* Map buffer if necessary.  Need to lock to prevent other contexts
     * from uploading the buffer under us.
     */