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intel: Add a little span cache to spead up readpixels by cutting syscalls.

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This commit is contained in:
Eric Anholt
2008-07-23 09:17:07 -07:00
parent d2d5abfaeb
commit 2e37143800
3 changed files with 42 additions and 12 deletions
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48
src/mesa/drivers/dri/intel/intel_span.c
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@@ -43,51 +43,74 @@ static void
intel_set_span_functions(struct intel_context *intel,
struct gl_renderbuffer *rb);
#define SPAN_CACHE_SIZE 4096
static void
get_span_cache(struct intel_renderbuffer *irb, uint32_t offset)
{
if (irb->span_cache == NULL) {
irb->span_cache = _mesa_malloc(SPAN_CACHE_SIZE);
irb->span_cache_offset = -1;
}
if ((offset & ~(SPAN_CACHE_SIZE - 1)) != irb->span_cache_offset) {
irb->span_cache_offset = offset & ~(SPAN_CACHE_SIZE - 1);
dri_bo_get_subdata(irb->region->buffer, irb->span_cache_offset,
SPAN_CACHE_SIZE, irb->span_cache);
}
}
static void
clear_span_cache(struct intel_renderbuffer *irb)
{
irb->span_cache_offset = -1;
}
static uint32_t
pread_32(struct intel_renderbuffer *irb, uint32_t offset)
{
uint32_t val;
get_span_cache(irb, offset);
dri_bo_get_subdata(irb->region->buffer, offset, 4, &val);
return val;
return *(uint32_t *)(irb->span_cache + (offset & (SPAN_CACHE_SIZE - 1)));
}
static uint16_t
pread_16(struct intel_renderbuffer *irb, uint32_t offset)
{
uint16_t val;
get_span_cache(irb, offset);
dri_bo_get_subdata(irb->region->buffer, offset, 2, &val);
return val;
return *(uint16_t *)(irb->span_cache + (offset & (SPAN_CACHE_SIZE - 1)));
}
static uint8_t
pread_8(struct intel_renderbuffer *irb, uint32_t offset)
{
uint8_t val;
get_span_cache(irb, offset);
dri_bo_get_subdata(irb->region->buffer, offset, 1, &val);
return val;
return *(uint8_t *)(irb->span_cache + (offset & (SPAN_CACHE_SIZE - 1)));
}
static void
pwrite_32(struct intel_renderbuffer *irb, uint32_t offset, uint32_t val)
{
clear_span_cache(irb);
dri_bo_subdata(irb->region->buffer, offset, 4, &val);
}
static void
pwrite_16(struct intel_renderbuffer *irb, uint32_t offset, uint16_t val)
{
clear_span_cache(irb);
dri_bo_subdata(irb->region->buffer, offset, 2, &val);
}
static void
pwrite_8(struct intel_renderbuffer *irb, uint32_t offset, uint8_t val)
{
clear_span_cache(irb);
dri_bo_subdata(irb->region->buffer, offset, 1, &val);
}
@@ -481,6 +504,7 @@ intel_renderbuffer_unmap(struct intel_context *intel,
if (irb == NULL || irb->region == NULL)
return;
clear_span_cache(irb);
irb->pfPitch = 0;
rb->GetRow = NULL;