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optimize case of reading GL_DEPTH_STENCIL pixels from GL_DEPTH_STENCIL renderbuffer

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This commit is contained in:
Brian Paul
2005-11-17 04:51:08 +00:00
parent f81c78f87d
commit 11f179e01b
1 changed files with 60 additions and 27 deletions
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87
src/mesa/swrast/s_readpix.c
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@@ -420,7 +420,6 @@ read_depth_stencil_pixels(GLcontext *ctx,
const GLboolean stencilTransfer = ctx->Pixel.IndexShift
|| ctx->Pixel.IndexOffset || ctx->Pixel.MapStencilFlag;
struct gl_renderbuffer *depthRb, *stencilRb;
GLint i;
depthRb = ctx->ReadBuffer->_DepthBuffer;
stencilRb = ctx->ReadBuffer->_StencilBuffer;
@@ -428,34 +427,68 @@ read_depth_stencil_pixels(GLcontext *ctx,
ASSERT(depthRb);
ASSERT(stencilRb);
for (i = 0; i < height; i++) {
GLstencil stencilVals[MAX_WIDTH];
depthRb = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
stencilRb = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
GLuint *depthStencilDst = (GLuint *)
_mesa_image_address2d(packing, pixels, width, height,
GL_DEPTH_STENCIL_EXT, type, i, 0);
_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);
}
if (depthRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
stencilRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
depthRb == stencilRb &&
!scaleOrBias &&
!stencilTransfer) {
/* This is the ideal case.
* Reading GL_DEPTH_STENCIL pixels from combined depth/stencil buffer.
* Plus, no pixel transfer ops to worry about!
*/
GLint i;
GLint dstStride = _mesa_image_row_stride(packing, width,
GL_DEPTH_STENCIL_EXT, type);
GLubyte *dst = (GLubyte *) _mesa_image_address2d(packing, pixels,
width, height,
GL_DEPTH_STENCIL_EXT,
type, 0, 0);
for (i = 0; i < height; i++) {
depthRb->GetRow(ctx, depthRb, width, x, y + i, dst);
dst += dstStride;
}
else {
/* general case */
GLfloat depthVals[MAX_WIDTH];
_swrast_read_depth_span_float(ctx, depthRb, width, x, y + i,
depthVals);
_mesa_pack_depth_stencil_span(ctx, width, depthStencilDst,
depthVals, stencilVals, packing);
}
else {
/* Reading GL_DEPTH_STENCIL pixels from separate depth/stencil buffers,
* or we need pixel transfer.
*/
GLint i;
depthRb = ctx->ReadBuffer->_DepthBuffer;
stencilRb = ctx->ReadBuffer->_StencilBuffer;
for (i = 0; i < height; i++) {
GLstencil stencilVals[MAX_WIDTH];
GLuint *depthStencilDst = (GLuint *)
_mesa_image_address2d(packing, pixels, width, height,
GL_DEPTH_STENCIL_EXT, type, i, 0);
_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,
depthVals);
_mesa_pack_depth_stencil_span(ctx, width, depthStencilDst,
depthVals, stencilVals, packing);
}
}
}
}