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meta: Add acceleration for depth glBlitFramebuffer(). 

Surprisingly, the GLSL shaders already wrote the sampled r value to
FragDepth.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=51600
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Eric Anholt 2014-02-04 23:57:29 -08:00
parent 067c7b67e8
commit 255bd9c0b8
1 changed files with 23 additions and 6 deletions
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29
src/mesa/drivers/common/meta_blit.c
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@ -94,7 +94,7 @@ setup_glsl_blit_framebuffer(struct gl_context *ctx,
}
/**
* Try to do a color-only glBlitFramebuffer using texturing.
* Try to do a color or depth glBlitFramebuffer using texturing.
*
* We can do this when the src renderbuffer is actually a texture, or when the
* driver exposes BindRenderbufferTexImage().
@ -104,11 +104,12 @@ blitframebuffer_texture(struct gl_context *ctx,
GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
GLenum filter, GLint flipX, GLint flipY,
GLboolean glsl_version)
GLboolean glsl_version, GLboolean do_depth)
{
const struct gl_framebuffer *readFb = ctx->ReadBuffer;
int att_index = do_depth ? BUFFER_DEPTH : readFb->_ColorReadBufferIndex;
const struct gl_renderbuffer_attachment *readAtt =
&readFb->Attachment[readFb->_ColorReadBufferIndex];
&readFb->Attachment[att_index];
struct blit_state *blit = &ctx->Meta->Blit;
const GLint dstX = MIN2(dstX0, dstX1);
const GLint dstY = MIN2(dstY0, dstY1);
@ -263,8 +264,11 @@ blitframebuffer_texture(struct gl_context *ctx,
/* setup viewport */
_mesa_set_viewport(ctx, 0, dstX, dstY, dstW, dstH);
_mesa_ColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
_mesa_DepthMask(GL_FALSE);
_mesa_ColorMask(!do_depth, !do_depth, !do_depth, !do_depth);
_mesa_set_enable(ctx, GL_DEPTH_TEST, do_depth);
_mesa_DepthMask(do_depth);
_mesa_DepthFunc(GL_ALWAYS);
_mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
/* Restore texture object state, the texture binding will
@ -338,7 +342,7 @@ _mesa_meta_BlitFramebuffer(struct gl_context *ctx,
if (blitframebuffer_texture(ctx, srcX0, srcY0, srcX1, srcY1,
dstX0, dstY0, dstX1, dstY1,
filter, dstFlipX, dstFlipY,
use_glsl_version)) {
use_glsl_version, false)) {
mask &= ~GL_COLOR_BUFFER_BIT;
if (mask == 0x0) {
_mesa_meta_end(ctx);
@ -347,6 +351,19 @@ _mesa_meta_BlitFramebuffer(struct gl_context *ctx,
}
}
if (mask & GL_DEPTH_BUFFER_BIT && use_glsl_version) {
if (blitframebuffer_texture(ctx, srcX0, srcY0, srcX1, srcY1,
dstX0, dstY0, dstX1, dstY1,
filter, dstFlipX, dstFlipY,
use_glsl_version, true)) {
mask &= ~GL_DEPTH_BUFFER_BIT;
if (mask == 0x0) {
_mesa_meta_end(ctx);
return;
}
}
}
/* Choose between glsl version and fixed function version of
* BlitFramebuffer function.
*/