1 files changed, 343 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_buffers.c b/src/mesa/drivers/dri/intel/intel_buffers.c
new file mode 100644
index 0000000000..7f2144abd4
--- /dev/null
+++ b/src/mesa/drivers/dri/intel/intel_buffers.c
@@ -0,0 +1,343 @@
+/**************************************************************************
+ * 
+ * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+
+#include "intel_context.h"
+#include "intel_buffers.h"
+#include "intel_fbo.h"
+#include "intel_regions.h"
+#include "intel_batchbuffer.h"
+#include "main/framebuffer.h"
+#include "drirenderbuffer.h"
+
+
+/**
+ * XXX move this into a new dri/common/cliprects.c file.
+ */
+GLboolean
+intel_intersect_cliprects(drm_clip_rect_t * dst,
+                          const drm_clip_rect_t * a,
+                          const drm_clip_rect_t * b)
+{
+   GLint bx = b->x1;
+   GLint by = b->y1;
+   GLint bw = b->x2 - bx;
+   GLint bh = b->y2 - by;
+
+   if (bx < a->x1)
+      bw -= a->x1 - bx, bx = a->x1;
+   if (by < a->y1)
+      bh -= a->y1 - by, by = a->y1;
+   if (bx + bw > a->x2)
+      bw = a->x2 - bx;
+   if (by + bh > a->y2)
+      bh = a->y2 - by;
+   if (bw <= 0)
+      return GL_FALSE;
+   if (bh <= 0)
+      return GL_FALSE;
+
+   dst->x1 = bx;
+   dst->y1 = by;
+   dst->x2 = bx + bw;
+   dst->y2 = by + bh;
+
+   return GL_TRUE;
+}
+
+/**
+ * Return pointer to current color drawing region, or NULL.
+ */
+struct intel_region *
+intel_drawbuf_region(struct intel_context *intel)
+{
+   struct intel_renderbuffer *irbColor =
+      intel_renderbuffer(intel->ctx.DrawBuffer->_ColorDrawBuffers[0]);
+   if (irbColor)
+      return irbColor->region;
+   else
+      return NULL;
+}
+
+/**
+ * Return pointer to current color reading region, or NULL.
+ */
+struct intel_region *
+intel_readbuf_region(struct intel_context *intel)
+{
+   struct intel_renderbuffer *irb
+      = intel_renderbuffer(intel->ctx.ReadBuffer->_ColorReadBuffer);
+   if (irb)
+      return irb->region;
+   else
+      return NULL;
+}
+
+void
+intel_get_cliprects(struct intel_context *intel,
+		    struct drm_clip_rect **cliprects,
+		    unsigned int *num_cliprects,
+		    int *x_off, int *y_off)
+{
+   __DRIdrawablePrivate *dPriv = intel->driDrawable;
+
+   if (intel->constant_cliprect) {
+      /* FBO or DRI2 rendering, which can just use the fb's size. */
+      intel->fboRect.x1 = 0;
+      intel->fboRect.y1 = 0;
+      intel->fboRect.x2 = intel->ctx.DrawBuffer->Width;
+      intel->fboRect.y2 = intel->ctx.DrawBuffer->Height;
+
+      *cliprects = &intel->fboRect;
+      *num_cliprects = 1;
+      *x_off = 0;
+      *y_off = 0;
+   } else if (intel->front_cliprects || dPriv->numBackClipRects == 0) {
+      /* use the front clip rects */
+      *cliprects = dPriv->pClipRects;
+      *num_cliprects = dPriv->numClipRects;
+      *x_off = dPriv->x;
+      *y_off = dPriv->y;
+   }
+   else {
+      /* use the back clip rects */
+      *num_cliprects = dPriv->numBackClipRects;
+      *cliprects = dPriv->pBackClipRects;
+      *x_off = dPriv->backX;
+      *y_off = dPriv->backY;
+   }
+}
+
+
+/**
+ * Update the hardware state for drawing into a window or framebuffer object.
+ *
+ * Called by glDrawBuffer, glBindFramebufferEXT, MakeCurrent, and other
+ * places within the driver.
+ *
+ * Basically, this needs to be called any time the current framebuffer
+ * changes, the renderbuffers change, or we need to draw into different
+ * color buffers.
+ */
+void
+intel_draw_buffer(GLcontext * ctx, struct gl_framebuffer *fb)
+{
+   struct intel_context *intel = intel_context(ctx);
+   struct intel_region *colorRegions[MAX_DRAW_BUFFERS], *depthRegion = NULL;
+   struct intel_renderbuffer *irbDepth = NULL, *irbStencil = NULL;
+
+   if (!fb) {
+      /* this can happen during the initial context initialization */
+      return;
+   }
+
+   /* Do this here, not core Mesa, since this function is called from
+    * many places within the driver.
+    */
+   if (ctx->NewState & (_NEW_BUFFERS | _NEW_COLOR | _NEW_PIXEL)) {
+      /* this updates the DrawBuffer->_NumColorDrawBuffers fields, etc */
+      _mesa_update_framebuffer(ctx);
+      /* this updates the DrawBuffer's Width/Height if it's a FBO */
+      _mesa_update_draw_buffer_bounds(ctx);
+   }
+
+   if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+      /* this may occur when we're called by glBindFrameBuffer() during
+       * the process of someone setting up renderbuffers, etc.
+       */
+      /*_mesa_debug(ctx, "DrawBuffer: incomplete user FBO\n");*/
+      return;
+   }
+
+   /*
+    * How many color buffers are we drawing into?
+    */
+   if (fb->_NumColorDrawBuffers == 0) {
+      /* writing to 0  */
+      colorRegions[0] = NULL;
+      intel->constant_cliprect = GL_TRUE;
+   }
+   else if (fb->_NumColorDrawBuffers > 1) {
+       int i;
+       struct intel_renderbuffer *irb;
+
+       for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
+           irb = intel_renderbuffer(fb->_ColorDrawBuffers[i]);
+           colorRegions[i] = irb ? irb->region : NULL;
+       }
+       intel->constant_cliprect = GL_TRUE;
+   }
+   else {
+      /* Get the intel_renderbuffer for the single colorbuffer we're drawing
+       * into, and set up cliprects if it's .
+       */
+      if (fb->Name == 0) {
+	 intel->constant_cliprect = intel->driScreen->dri2.enabled;
+	 /* drawing to window system buffer */
+	 if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
+	    if (!intel->constant_cliprect && !intel->front_cliprects)
+	       intel_batchbuffer_flush(intel->batch);
+	    intel->front_cliprects = GL_TRUE;
+	    colorRegions[0] = intel_get_rb_region(fb, BUFFER_FRONT_LEFT);
+	 }
+	 else {
+	    if (!intel->constant_cliprect && intel->front_cliprects)
+	       intel_batchbuffer_flush(intel->batch);
+	    intel->front_cliprects = GL_FALSE;
+	    colorRegions[0]= intel_get_rb_region(fb, BUFFER_BACK_LEFT);
+	 }
+      }
+      else {
+	 /* drawing to user-created FBO */
+	 struct intel_renderbuffer *irb;
+	 irb = intel_renderbuffer(fb->_ColorDrawBuffers[0]);
+	 colorRegions[0] = (irb && irb->region) ? irb->region : NULL;
+	 intel->constant_cliprect = GL_TRUE;
+      }
+   }
+
+   if (!colorRegions[0]) {
+      FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE);
+   }
+   else {
+      FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE);
+   }
+
+   /***
+    *** Get depth buffer region and check if we need a software fallback.
+    *** Note that the depth buffer is usually a DEPTH_STENCIL buffer.
+    ***/
+   if (fb->_DepthBuffer && fb->_DepthBuffer->Wrapped) {
+      irbDepth = intel_renderbuffer(fb->_DepthBuffer->Wrapped);
+      if (irbDepth && irbDepth->region) {
+         FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
+         depthRegion = irbDepth->region;
+      }
+      else {
+         FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_TRUE);
+         depthRegion = NULL;
+      }
+   }
+   else {
+      /* not using depth buffer */
+      FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
+      depthRegion = NULL;
+   }
+
+   /***
+    *** Stencil buffer
+    *** This can only be hardware accelerated if we're using a
+    *** combined DEPTH_STENCIL buffer.
+    ***/
+   if (fb->_StencilBuffer && fb->_StencilBuffer->Wrapped) {
+      irbStencil = intel_renderbuffer(fb->_StencilBuffer->Wrapped);
+      if (irbStencil && irbStencil->region) {
+         ASSERT(irbStencil->Base._ActualFormat == GL_DEPTH24_STENCIL8_EXT);
+         FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
+      }
+      else {
+         FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_TRUE);
+      }
+   }
+   else {
+      /* XXX FBO: instead of FALSE, pass ctx->Stencil.Enabled ??? */
+      FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
+   }
+
+   /*
+    * Update depth and stencil test state
+    */
+   if (ctx->Driver.Enable) {
+      ctx->Driver.Enable(ctx, GL_DEPTH_TEST,
+                         (ctx->Depth.Test && fb->Visual.depthBits > 0));
+      ctx->Driver.Enable(ctx, GL_STENCIL_TEST,
+                         (ctx->Stencil.Enabled && fb->Visual.stencilBits > 0));
+   }
+   else {
+      ctx->NewState |= (_NEW_DEPTH | _NEW_STENCIL);
+   }
+
+   intel->vtbl.set_draw_region(intel, colorRegions, depthRegion, 
+                               fb->_NumColorDrawBuffers);
+
+   /* update viewport since it depends on window size */
+#ifdef I915
+   intelCalcViewport(ctx);
+#else
+   ctx->NewState |= _NEW_VIEWPORT;
+#endif
+   /* Set state we know depends on drawable parameters:
+    */
+   if (ctx->Driver.Scissor)
+      ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y,
+			  ctx->Scissor.Width, ctx->Scissor.Height);
+   intel->NewGLState |= _NEW_SCISSOR;
+
+   if (ctx->Driver.DepthRange)
+      ctx->Driver.DepthRange(ctx,
+			     ctx->Viewport.Near,
+			     ctx->Viewport.Far);
+
+   /* Update culling direction which changes depending on the
+    * orientation of the buffer:
+    */
+   if (ctx->Driver.FrontFace)
+      ctx->Driver.FrontFace(ctx, ctx->Polygon.FrontFace);
+   else
+      ctx->NewState |= _NEW_POLYGON;
+}
+
+
+static void
+intelDrawBuffer(GLcontext * ctx, GLenum mode)
+{
+   intel_draw_buffer(ctx, ctx->DrawBuffer);
+}
+
+
+static void
+intelReadBuffer(GLcontext * ctx, GLenum mode)
+{
+   if (ctx->ReadBuffer == ctx->DrawBuffer) {
+      /* This will update FBO completeness status.
+       * A framebuffer will be incomplete if the GL_READ_BUFFER setting
+       * refers to a missing renderbuffer.  Calling glReadBuffer can set
+       * that straight and can make the drawing buffer complete.
+       */
+      intel_draw_buffer(ctx, ctx->DrawBuffer);
+   }
+   /* Generally, functions which read pixels (glReadPixels, glCopyPixels, etc)
+    * reference ctx->ReadBuffer and do appropriate state checks.
+    */
+}
+
+
+void
+intelInitBufferFuncs(struct dd_function_table *functions)
+{
+   functions->DrawBuffer = intelDrawBuffer;
+   functions->ReadBuffer = intelReadBuffer;
+}