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      1 /**************************************************************************
      2 
      3 Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
      4 Copyright 2000, 2001 ATI Technologies Inc., Ontario, Canada, and
      5                      VA Linux Systems Inc., Fremont, California.
      6 
      7 The Weather Channel (TM) funded Tungsten Graphics to develop the
      8 initial release of the Radeon 8500 driver under the XFree86 license.
      9 This notice must be preserved.
     10 
     11 All Rights Reserved.
     12 
     13 Permission is hereby granted, free of charge, to any person obtaining
     14 a copy of this software and associated documentation files (the
     15 "Software"), to deal in the Software without restriction, including
     16 without limitation the rights to use, copy, modify, merge, publish,
     17 distribute, sublicense, and/or sell copies of the Software, and to
     18 permit persons to whom the Software is furnished to do so, subject to
     19 the following conditions:
     20 
     21 The above copyright notice and this permission notice (including the
     22 next paragraph) shall be included in all copies or substantial
     23 portions of the Software.
     24 
     25 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     26 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     27 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
     28 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
     29 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     30 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     31 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     32 
     33 **************************************************************************/
     34 
     35 /*
     36  * Authors:
     37  *   Kevin E. Martin <martin (at) valinux.com>
     38  *   Gareth Hughes <gareth (at) valinux.com>
     39  *   Keith Whitwell <keithw (at) vmware.com>
     40  *
     41  */
     42 
     43 #include "main/glheader.h"
     44 #include "main/texformat.h"
     45 #include "main/renderbuffer.h"
     46 #include "main/samplerobj.h"
     47 #include "swrast/swrast.h"
     48 #include "swrast/s_renderbuffer.h"
     49 
     50 #include "radeon_common.h"
     51 #include "radeon_span.h"
     52 
     53 
     54 static void
     55 radeon_renderbuffer_map(struct gl_context *ctx, struct gl_renderbuffer *rb)
     56 {
     57 	struct radeon_renderbuffer *rrb = radeon_renderbuffer(rb);
     58 	GLubyte *map;
     59 	int stride;
     60 
     61 	if (!rb || !rrb)
     62 		return;
     63 
     64 	ctx->Driver.MapRenderbuffer(ctx, rb, 0, 0, rb->Width, rb->Height,
     65 				    GL_MAP_READ_BIT | GL_MAP_WRITE_BIT,
     66 				    &map, &stride);
     67 
     68 	rrb->base.Map = map;
     69 	rrb->base.RowStride = stride;
     70 	/* No floating point color buffers, use GLubytes */
     71 	rrb->base.ColorType = GL_UNSIGNED_BYTE;
     72 }
     73 
     74 static void
     75 radeon_renderbuffer_unmap(struct gl_context *ctx, struct gl_renderbuffer *rb)
     76 {
     77 	struct radeon_renderbuffer *rrb = radeon_renderbuffer(rb);
     78 	if (!rb || !rrb)
     79 		return;
     80 
     81 	ctx->Driver.UnmapRenderbuffer(ctx, rb);
     82 
     83 	rrb->base.Map = NULL;
     84 	rrb->base.RowStride = 0;
     85 }
     86 
     87 static void
     88 radeon_map_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
     89 {
     90 	GLuint i;
     91 
     92 	radeon_print(RADEON_MEMORY, RADEON_TRACE,
     93 		"%s( %p , fb %p )\n",
     94 		     __func__, ctx, fb);
     95 
     96 	/* check for render to textures */
     97 	for (i = 0; i < BUFFER_COUNT; i++)
     98 		radeon_renderbuffer_map(ctx, fb->Attachment[i].Renderbuffer);
     99 
    100 	radeon_check_front_buffer_rendering(ctx);
    101 }
    102 
    103 static void
    104 radeon_unmap_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
    105 {
    106 	GLuint i;
    107 
    108 	radeon_print(RADEON_MEMORY, RADEON_TRACE,
    109 		"%s( %p , fb %p)\n",
    110 		     __func__, ctx, fb);
    111 
    112 	/* check for render to textures */
    113 	for (i = 0; i < BUFFER_COUNT; i++)
    114 		radeon_renderbuffer_unmap(ctx, fb->Attachment[i].Renderbuffer);
    115 
    116 	radeon_check_front_buffer_rendering(ctx);
    117 }
    118 
    119 static void radeonSpanRenderStart(struct gl_context * ctx)
    120 {
    121 	radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
    122 
    123 	radeon_firevertices(rmesa);
    124 
    125 	_swrast_map_textures(ctx);
    126 
    127 	radeon_map_framebuffer(ctx, ctx->DrawBuffer);
    128 	if (ctx->ReadBuffer != ctx->DrawBuffer)
    129 		radeon_map_framebuffer(ctx, ctx->ReadBuffer);
    130 }
    131 
    132 static void radeonSpanRenderFinish(struct gl_context * ctx)
    133 {
    134 	_swrast_flush(ctx);
    135 	_swrast_unmap_textures(ctx);
    136 
    137 	radeon_unmap_framebuffer(ctx, ctx->DrawBuffer);
    138 	if (ctx->ReadBuffer != ctx->DrawBuffer)
    139 		radeon_unmap_framebuffer(ctx, ctx->ReadBuffer);
    140 }
    141 
    142 void radeonInitSpanFuncs(struct gl_context * ctx)
    143 {
    144 	struct swrast_device_driver *swdd =
    145 	    _swrast_GetDeviceDriverReference(ctx);
    146 	swdd->SpanRenderStart = radeonSpanRenderStart;
    147 	swdd->SpanRenderFinish = radeonSpanRenderFinish;
    148 }
    149 
    150