summaryrefslogtreecommitdiffstats
path: root/src/mesa/drivers/dri/intel/intel_buffers.c
blob: 7f2144abd4b93adb55620b5503113ac98d017a3e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
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;
}