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swrast: Add a readpixels fast-path based on memcpy and MapRenderbuffer. 

v2: Move _mesa_get_format_bytes out of the loop.

Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Eric Anholt 2011-10-12 16:28:29 -07:00
parent 5f140bceda
commit 2e82daa31b
1 changed files with 53 additions and 4 deletions
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57
src/mesa/swrast/s_readpix.c
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@ -270,6 +270,47 @@ fast_read_rgba_pixels( struct gl_context *ctx,
return GL_FALSE;
}
static GLboolean
fast_read_rgba_pixels_memcpy( struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
GLvoid *pixels,
const struct gl_pixelstore_attrib *packing,
GLbitfield transferOps )
{
struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
GLubyte *dst, *map;
int dstStride, stride, j, texelBytes;
if (!_mesa_format_matches_format_and_type(rb->Format, format, type))
return GL_FALSE;
/* check for things we can't handle here */
if (packing->SwapBytes ||
packing->LsbFirst) {
return GL_FALSE;
}
dstStride = _mesa_image_row_stride(packing, width, format, type);
dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
format, type, 0, 0);
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &stride);
texelBytes = _mesa_get_format_bytes(rb->Format);
for (j = 0; j < height; j++) {
memcpy(dst, map, width * texelBytes);
dst += dstStride;
map += stride;
}
ctx->Driver.UnmapRenderbuffer(ctx, rb);
return GL_TRUE;
}
/**
* When we're using a low-precision color buffer (like 16-bit 5/6/5)
@ -338,10 +379,18 @@ read_rgba_pixels( struct gl_context *ctx,
transferOps |= IMAGE_CLAMP_BIT;
}
/* Try the optimized path first. */
if (fast_read_rgba_pixels(ctx, x, y, width, height,
format, type, pixels, packing, transferOps)) {
return; /* done! */
if (!transferOps) {
/* Try the optimized paths first. */
if (fast_read_rgba_pixels_memcpy(ctx, x, y, width, height,
format, type, pixels, packing,
transferOps)) {
return;
}
if (fast_read_rgba_pixels(ctx, x, y, width, height,
format, type, pixels, packing, transferOps)) {
return;
}
}
/* width should never be > MAX_WIDTH since we did clipping earlier */