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swrast: MapRenderbuffer in separate depth/stencil readpixels fastpath

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This introduces two new span helper functions we'll want to use in
several places as we move to MapRenderbuffer, which pull out integer
depth and stencil values from a renderbuffer mapping based on the
renderbuffer format.

v2: Use format_unpack helper for stencil read.
v3: Clean up comment after conversion to format_unpack.

Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Eric Anholt 2011-10-12 12:40:18 -07:00
parent e452fbe871
commit f53680857a
2 changed files with 59 additions and 21 deletions
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1
src/mesa/swrast/s_depth.h
View file

@ -53,7 +53,6 @@ extern void
_swrast_read_depth_span_uint( struct gl_context *ctx, struct gl_renderbuffer *rb,
GLint n, GLint x, GLint y, GLuint depth[] );
extern void
_swrast_clear_depth_buffer( struct gl_context *ctx, struct gl_renderbuffer *rb );

79
src/mesa/swrast/s_readpix.c
View file

@ -366,14 +366,14 @@ read_rgba_pixels( struct gl_context *ctx,
}
/**
* For a packed depth/stencil buffer being read as depth/stencil, memcpy the
* For a packed depth/stencil buffer being read as depth/stencil, just memcpy the
* data (possibly swapping 8/24 vs 24/8 as we go).
*/
static GLboolean
fast_read_depth_stencil_pixels(struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type, GLvoid *dst, int dstStride)
GLvoid *dst, int dstStride)
{
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
@ -384,9 +384,6 @@ fast_read_depth_stencil_pixels(struct gl_context *ctx,
if (rb != stencilRb)
return GL_FALSE;
if (type != GL_UNSIGNED_INT_24_8)
return GL_FALSE;
if (rb->Format != MESA_FORMAT_Z24_S8 &&
rb->Format != MESA_FORMAT_S8_Z24)
return GL_FALSE;
@ -407,6 +404,54 @@ fast_read_depth_stencil_pixels(struct gl_context *ctx,
}
/**
* For non-float-depth and stencil buffers being read as 24/8 depth/stencil,
* copy the integer data directly instead of converting depth to float and
* re-packing.
*/
static GLboolean
fast_read_depth_stencil_pixels_separate(struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
uint32_t *dst, int dstStride)
{
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *depthRb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
struct gl_renderbuffer *stencilRb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
GLubyte *depthMap, *stencilMap;
int depthStride, stencilStride, i, j;
if (_mesa_get_format_datatype(depthRb->Format) != GL_UNSIGNED_INT)
return GL_FALSE;
ctx->Driver.MapRenderbuffer(ctx, depthRb, x, y, width, height,
GL_MAP_READ_BIT, &depthMap, &depthStride);
ctx->Driver.MapRenderbuffer(ctx, stencilRb, x, y, width, height,
GL_MAP_READ_BIT, &stencilMap, &stencilStride);
for (j = 0; j < height; j++) {
GLstencil stencilVals[MAX_WIDTH];
_mesa_unpack_uint_z_row(depthRb->Format, width, depthMap, dst);
_mesa_unpack_ubyte_stencil_row(stencilRb->Format, width,
stencilMap, stencilVals);
for (i = 0; i < width; i++) {
dst[i] = (dst[i] & 0xffffff00) | stencilVals[i];
}
depthMap += depthStride;
stencilMap += stencilStride;
dst += dstStride / 4;
}
ctx->Driver.UnmapRenderbuffer(ctx, depthRb);
ctx->Driver.UnmapRenderbuffer(ctx, stencilRb);
return GL_TRUE;
}
/**
* Read combined depth/stencil values.
* We'll have already done error checking to be sure the expected
@ -440,10 +485,16 @@ read_depth_stencil_pixels(struct gl_context *ctx,
dstStride = _mesa_image_row_stride(packing, width,
GL_DEPTH_STENCIL_EXT, type);
if (!scaleOrBias && !stencilTransfer && !packing->SwapBytes) {
if (fast_read_depth_stencil_pixels(ctx, x, y, width, height, type,
/* Fast 24/8 reads. */
if (type == GL_UNSIGNED_INT_24_8 &&
!scaleOrBias && !stencilTransfer && !packing->SwapBytes) {
if (fast_read_depth_stencil_pixels(ctx, x, y, width, height,
dst, dstStride))
return;
if (fast_read_depth_stencil_pixels_separate(ctx, x, y, width, height,
(uint32_t *)dst, dstStride))
return;
}
/* Reading GL_DEPTH_STENCIL pixels from separate depth/stencil buffers,
@ -459,19 +510,7 @@ read_depth_stencil_pixels(struct gl_context *ctx,
_swrast_read_stencil_span(ctx, stencilRb, width,
x, y + i, stencilVals);
if (!scaleOrBias && !stencilTransfer
&& ctx->ReadBuffer->Visual.depthBits == 24) {
/* ideal case */
GLuint zVals[MAX_WIDTH]; /* 24-bit values! */
GLint j;
ASSERT(depthRb->DataType == GL_UNSIGNED_INT);
/* note, we've already been clipped */
depthRb->GetRow(ctx, depthRb, width, x, y + i, zVals);
for (j = 0; j < width; j++) {
depthStencilDst[j] = (zVals[j] << 8) | (stencilVals[j] & 0xff);
}
}
else {
{
/* general case */
GLfloat depthVals[MAX_WIDTH];
_swrast_read_depth_span_float(ctx, depthRb, width, x, y + i,