1 /**************************************************************************
2 *
3 * Copyright 2003 VMware, Inc.
4 * Copyright 2009 Intel Corporation.
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28
29 #include "main/glheader.h"
30 #include "main/mtypes.h"
31 #include "main/condrender.h"
32 #include "swrast/swrast.h"
33 #include "drivers/common/meta.h"
34
35 #include "intel_context.h"
36 #include "intel_blit.h"
37 #include "intel_clear.h"
38 #include "intel_fbo.h"
39 #include "intel_regions.h"
40
41 #define FILE_DEBUG_FLAG DEBUG_BLIT
42
43 static const char *buffer_names[] = {
44 [BUFFER_FRONT_LEFT] = "front",
45 [BUFFER_BACK_LEFT] = "back",
46 [BUFFER_FRONT_RIGHT] = "front right",
47 [BUFFER_BACK_RIGHT] = "back right",
48 [BUFFER_DEPTH] = "depth",
49 [BUFFER_STENCIL] = "stencil",
50 [BUFFER_ACCUM] = "accum",
51 [BUFFER_COLOR0] = "color0",
52 [BUFFER_COLOR1] = "color1",
53 [BUFFER_COLOR2] = "color2",
54 [BUFFER_COLOR3] = "color3",
55 [BUFFER_COLOR4] = "color4",
56 [BUFFER_COLOR5] = "color5",
57 [BUFFER_COLOR6] = "color6",
58 [BUFFER_COLOR7] = "color7",
59 };
60
61 static void
debug_mask(const char * name,GLbitfield mask)62 debug_mask(const char *name, GLbitfield mask)
63 {
64 GLuint i;
65
66 if (unlikely(INTEL_DEBUG & DEBUG_BLIT)) {
67 DBG("%s clear:", name);
68 for (i = 0; i < BUFFER_COUNT; i++) {
69 if (mask & (1 << i))
70 DBG(" %s", buffer_names[i]);
71 }
72 DBG("\n");
73 }
74 }
75
76 /**
77 * Called by ctx->Driver.Clear.
78 */
79 static void
intelClear(struct gl_context * ctx,GLbitfield mask)80 intelClear(struct gl_context *ctx, GLbitfield mask)
81 {
82 struct intel_context *intel = intel_context(ctx);
83 GLbitfield tri_mask = 0;
84 GLbitfield blit_mask = 0;
85 GLbitfield swrast_mask = 0;
86 struct gl_framebuffer *fb = ctx->DrawBuffer;
87 struct intel_renderbuffer *irb;
88 int i;
89
90 if (mask & (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_FRONT_RIGHT)) {
91 intel->front_buffer_dirty = true;
92 }
93
94 if (0)
95 fprintf(stderr, "%s\n", __func__);
96
97 /* Get SW clears out of the way: Anything without an intel_renderbuffer */
98 for (i = 0; i < BUFFER_COUNT; i++) {
99 if (!(mask & (1 << i)))
100 continue;
101
102 irb = intel_get_renderbuffer(fb, i);
103 if (unlikely(!irb)) {
104 swrast_mask |= (1 << i);
105 mask &= ~(1 << i);
106 }
107 }
108 if (unlikely(swrast_mask)) {
109 debug_mask("swrast", swrast_mask);
110 _swrast_Clear(ctx, swrast_mask);
111 }
112
113 /* HW color buffers (front, back, aux, generic FBO, etc) */
114 if (GET_COLORMASK(ctx->Color.ColorMask, 0) == 0xf) {
115 /* clear all R,G,B,A */
116 blit_mask |= (mask & BUFFER_BITS_COLOR);
117 }
118 else {
119 /* glColorMask in effect */
120 tri_mask |= (mask & BUFFER_BITS_COLOR);
121 }
122
123 /* Make sure we have up to date buffers before we start looking at
124 * the tiling bits to determine how to clear. */
125 intel_prepare_render(intel);
126
127 /* HW stencil */
128 if (mask & BUFFER_BIT_STENCIL) {
129 const struct intel_region *stencilRegion
130 = intel_get_rb_region(fb, BUFFER_STENCIL);
131 if (stencilRegion) {
132 /* have hw stencil */
133 if (stencilRegion->tiling == I915_TILING_Y ||
134 (ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
135 /* We have to use the 3D engine if we're clearing a partial mask
136 * of the stencil buffer, or if we're on a 965 which has a tiled
137 * depth/stencil buffer in a layout we can't blit to.
138 */
139 tri_mask |= BUFFER_BIT_STENCIL;
140 }
141 else {
142 /* clearing all stencil bits, use blitting */
143 blit_mask |= BUFFER_BIT_STENCIL;
144 }
145 }
146 }
147
148 /* HW depth */
149 if (mask & BUFFER_BIT_DEPTH) {
150 const struct intel_region *irb = intel_get_rb_region(fb, BUFFER_DEPTH);
151
152 /* clear depth with whatever method is used for stencil (see above) */
153 if (irb->tiling == I915_TILING_Y || tri_mask & BUFFER_BIT_STENCIL)
154 tri_mask |= BUFFER_BIT_DEPTH;
155 else
156 blit_mask |= BUFFER_BIT_DEPTH;
157 }
158
159 /* If we're doing a tri pass for depth/stencil, include a likely color
160 * buffer with it.
161 */
162 if (mask & (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL)) {
163 int color_bit = ffs(mask & BUFFER_BITS_COLOR);
164 if (color_bit != 0) {
165 tri_mask |= blit_mask & (1 << (color_bit - 1));
166 blit_mask &= ~(1 << (color_bit - 1));
167 }
168 }
169
170 /* Anything left, just use tris */
171 tri_mask |= mask & ~blit_mask;
172
173 if (blit_mask) {
174 debug_mask("blit", blit_mask);
175 tri_mask |= intelClearWithBlit(ctx, blit_mask);
176 }
177
178 if (tri_mask) {
179 debug_mask("tri", tri_mask);
180 if (!ctx->Extensions.ARB_fragment_shader)
181 _mesa_meta_Clear(&intel->ctx, tri_mask);
182 else
183 _mesa_meta_glsl_Clear(&intel->ctx, tri_mask);
184 }
185 }
186
187
188 void
intelInitClearFuncs(struct dd_function_table * functions)189 intelInitClearFuncs(struct dd_function_table *functions)
190 {
191 functions->Clear = intelClear;
192 }
193