Commit a901d54f authored by Christoph Bumiller's avatar Christoph Bumiller

st/mesa: add support for GL_ARB_texture_buffer_range

v2: Update to handle BufferSize being -1 and return a NULL sampler
view if the specified range would cause out of bounds access.
Reviewed-by: Brian Paul's avatarBrian Paul <brianp@vmware.com>
Acked-by: default avatarIan Romanick <ian.d.romanick@intel.com>
parent 0fcd2c5e
......@@ -152,7 +152,27 @@ st_create_texture_sampler_view_from_stobj(struct pipe_context *pipe,
u_sampler_view_default_template(&templ,
stObj->pt,
format);
templ.u.tex.first_level = stObj->base.BaseLevel;
if (stObj->pt->target == PIPE_BUFFER) {
unsigned base, size;
unsigned f, n;
const struct util_format_description *desc
= util_format_description(templ.format);
base = stObj->base.BufferOffset;
if (base >= stObj->pt->width0)
return NULL;
size = MIN2(stObj->pt->width0 - base, (unsigned)stObj->base.BufferSize);
f = ((base * 8) / desc->block.bits) * desc->block.width;
n = ((size * 8) / desc->block.bits) * desc->block.width;
if (!n)
return NULL;
templ.u.buf.first_element = f;
templ.u.buf.last_element = f + (n - 1);
} else {
templ.u.tex.first_level = stObj->base.BaseLevel;
}
if (swizzle != SWIZZLE_NOOP) {
templ.swizzle_r = GET_SWZ(swizzle, 0);
......
......@@ -685,6 +685,13 @@ void st_init_extensions(struct st_context *st)
}
if (screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OBJECTS)) {
ctx->Extensions.ARB_texture_buffer_object = GL_TRUE;
ctx->Const.TextureBufferOffsetAlignment =
screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT);
if (ctx->Const.TextureBufferOffsetAlignment)
ctx->Extensions.ARB_texture_buffer_range = GL_TRUE;
init_format_extensions(st, tbo_rgb32, Elements(tbo_rgb32),
PIPE_BUFFER, PIPE_BIND_SAMPLER_VIEW);
}
......
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