| /* |
| * Copyright 2016 VMware, Inc. |
| * All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sub license, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the |
| * next paragraph) shall be included in all copies or substantial portions |
| * of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
| * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR |
| * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include "pipe/p_context.h" |
| #include "util/format/u_format.h" |
| #include "util/u_inlines.h" |
| |
| #include "main/context.h" |
| #include "main/macros.h" |
| #include "main/mtypes.h" |
| #include "main/teximage.h" |
| #include "main/texobj.h" |
| #include "program/prog_instruction.h" |
| |
| #include "st_context.h" |
| #include "st_sampler_view.h" |
| #include "st_texture.h" |
| #include "st_format.h" |
| #include "st_cb_bufferobjects.h" |
| #include "st_cb_texture.h" |
| |
| |
| /** |
| * Set the given view as the current context's view for the texture. |
| * |
| * Overwrites any pre-existing view of the context. |
| * |
| * Takes ownership of the view (i.e., stores the view without incrementing the |
| * reference count). |
| * |
| * \return the view, or NULL on error. In case of error, the reference to the |
| * view is released. |
| */ |
| static struct pipe_sampler_view * |
| st_texture_set_sampler_view(struct st_context *st, |
| struct st_texture_object *stObj, |
| struct pipe_sampler_view *view, |
| bool glsl130_or_later, bool srgb_skip_decode) |
| { |
| struct st_sampler_views *views; |
| struct st_sampler_view *free = NULL; |
| struct st_sampler_view *sv; |
| GLuint i; |
| |
| simple_mtx_lock(&stObj->validate_mutex); |
| views = stObj->sampler_views; |
| |
| for (i = 0; i < views->count; ++i) { |
| sv = &views->views[i]; |
| |
| /* Is the array entry used ? */ |
| if (sv->view) { |
| /* check if the context matches */ |
| if (sv->view->context == st->pipe) { |
| pipe_sampler_view_reference(&sv->view, NULL); |
| goto found; |
| } |
| } else { |
| /* Found a free slot, remember that */ |
| free = sv; |
| } |
| } |
| |
| /* Couldn't find a slot for our context, create a new one */ |
| if (free) { |
| sv = free; |
| } else { |
| if (views->count >= views->max) { |
| /* Allocate a larger container. */ |
| unsigned new_max = 2 * views->max; |
| unsigned new_size = sizeof(*views) + new_max * sizeof(views->views[0]); |
| |
| if (new_max < views->max || |
| new_max > (UINT_MAX - sizeof(*views)) / sizeof(views->views[0])) { |
| pipe_sampler_view_reference(&view, NULL); |
| goto out; |
| } |
| |
| struct st_sampler_views *new_views = malloc(new_size); |
| if (!new_views) { |
| pipe_sampler_view_reference(&view, NULL); |
| goto out; |
| } |
| |
| new_views->count = views->count; |
| new_views->max = new_max; |
| memcpy(&new_views->views[0], &views->views[0], |
| views->count * sizeof(views->views[0])); |
| |
| /* Initialize the pipe_sampler_view pointers to zero so that we don't |
| * have to worry about racing against readers when incrementing |
| * views->count. |
| */ |
| memset(&new_views->views[views->count], 0, |
| (new_max - views->count) * sizeof(views->views[0])); |
| |
| /* Use memory release semantics to ensure that concurrent readers will |
| * get the correct contents of the new container. |
| * |
| * Also, the write should be atomic, but that's guaranteed anyway on |
| * all supported platforms. |
| */ |
| p_atomic_set(&stObj->sampler_views, new_views); |
| |
| /* We keep the old container around until the texture object is |
| * deleted, because another thread may still be reading from it. We |
| * double the size of the container each time, so we end up with |
| * at most twice the total memory allocation. |
| */ |
| views->next = stObj->sampler_views_old; |
| stObj->sampler_views_old = views; |
| |
| views = new_views; |
| } |
| |
| sv = &views->views[views->count]; |
| |
| /* Since modification is guarded by the lock, only the write part of the |
| * increment has to be atomic, and that's already guaranteed on all |
| * supported platforms without using an atomic intrinsic. |
| */ |
| views->count++; |
| } |
| |
| found: |
| assert(sv->view == NULL); |
| |
| sv->glsl130_or_later = glsl130_or_later; |
| sv->srgb_skip_decode = srgb_skip_decode; |
| sv->view = view; |
| sv->st = st; |
| |
| out: |
| simple_mtx_unlock(&stObj->validate_mutex); |
| return view; |
| } |
| |
| |
| /** |
| * Return the most-recently validated sampler view for the texture \p stObj |
| * in the given context, if any. |
| * |
| * Performs no additional validation. |
| */ |
| const struct st_sampler_view * |
| st_texture_get_current_sampler_view(const struct st_context *st, |
| const struct st_texture_object *stObj) |
| { |
| const struct st_sampler_views *views = p_atomic_read(&stObj->sampler_views); |
| |
| for (unsigned i = 0; i < views->count; ++i) { |
| const struct st_sampler_view *sv = &views->views[i]; |
| if (sv->view && sv->view->context == st->pipe) |
| return sv; |
| } |
| |
| return NULL; |
| } |
| |
| |
| /** |
| * For the given texture object, release any sampler views which belong |
| * to the calling context. This is used to free any sampler views |
| * which belong to the context before the context is destroyed. |
| */ |
| void |
| st_texture_release_context_sampler_view(struct st_context *st, |
| struct st_texture_object *stObj) |
| { |
| GLuint i; |
| |
| simple_mtx_lock(&stObj->validate_mutex); |
| struct st_sampler_views *views = stObj->sampler_views; |
| for (i = 0; i < views->count; ++i) { |
| struct pipe_sampler_view **sv = &views->views[i].view; |
| |
| if (*sv && (*sv)->context == st->pipe) { |
| pipe_sampler_view_reference(sv, NULL); |
| break; |
| } |
| } |
| simple_mtx_unlock(&stObj->validate_mutex); |
| } |
| |
| |
| /** |
| * Release all sampler views attached to the given texture object, regardless |
| * of the context. This is called fairly frequently. For example, whenever |
| * the texture's base level, max level or swizzle change. |
| */ |
| void |
| st_texture_release_all_sampler_views(struct st_context *st, |
| struct st_texture_object *stObj) |
| { |
| /* TODO: This happens while a texture is deleted, because the Driver API |
| * is asymmetric: the driver allocates the texture object memory, but |
| * mesa/main frees it. |
| */ |
| if (!stObj->sampler_views) |
| return; |
| |
| simple_mtx_lock(&stObj->validate_mutex); |
| struct st_sampler_views *views = stObj->sampler_views; |
| for (unsigned i = 0; i < views->count; ++i) { |
| struct st_sampler_view *stsv = &views->views[i]; |
| if (stsv->view) { |
| if (stsv->st && stsv->st != st) { |
| /* Transfer this reference to the zombie list. It will |
| * likely be freed when the zombie list is freed. |
| */ |
| st_save_zombie_sampler_view(stsv->st, stsv->view); |
| stsv->view = NULL; |
| } else { |
| pipe_sampler_view_reference(&stsv->view, NULL); |
| } |
| } |
| } |
| views->count = 0; |
| simple_mtx_unlock(&stObj->validate_mutex); |
| } |
| |
| |
| /* |
| * Delete the texture's sampler views and st_sampler_views containers. |
| * This is to be called just before a texture is deleted. |
| */ |
| void |
| st_delete_texture_sampler_views(struct st_context *st, |
| struct st_texture_object *stObj) |
| { |
| st_texture_release_all_sampler_views(st, stObj); |
| |
| /* Free the container of the current per-context sampler views */ |
| assert(stObj->sampler_views->count == 0); |
| free(stObj->sampler_views); |
| stObj->sampler_views = NULL; |
| |
| /* Free old sampler view containers */ |
| while (stObj->sampler_views_old) { |
| struct st_sampler_views *views = stObj->sampler_views_old; |
| stObj->sampler_views_old = views->next; |
| free(views); |
| } |
| } |
| |
| |
| /** |
| * Return swizzle1(swizzle2) |
| */ |
| static unsigned |
| swizzle_swizzle(unsigned swizzle1, unsigned swizzle2) |
| { |
| unsigned i, swz[4]; |
| |
| if (swizzle1 == SWIZZLE_XYZW) { |
| /* identity swizzle, no change to swizzle2 */ |
| return swizzle2; |
| } |
| |
| for (i = 0; i < 4; i++) { |
| unsigned s = GET_SWZ(swizzle1, i); |
| switch (s) { |
| case SWIZZLE_X: |
| case SWIZZLE_Y: |
| case SWIZZLE_Z: |
| case SWIZZLE_W: |
| swz[i] = GET_SWZ(swizzle2, s); |
| break; |
| case SWIZZLE_ZERO: |
| swz[i] = SWIZZLE_ZERO; |
| break; |
| case SWIZZLE_ONE: |
| swz[i] = SWIZZLE_ONE; |
| break; |
| default: |
| assert(!"Bad swizzle term"); |
| swz[i] = SWIZZLE_X; |
| } |
| } |
| |
| return MAKE_SWIZZLE4(swz[0], swz[1], swz[2], swz[3]); |
| } |
| |
| |
| /** |
| * Given a user-specified texture base format, the actual gallium texture |
| * format and the current GL_DEPTH_MODE, return a texture swizzle. |
| * |
| * Consider the case where the user requests a GL_RGB internal texture |
| * format the driver actually uses an RGBA format. The A component should |
| * be ignored and sampling from the texture should always return (r,g,b,1). |
| * But if we rendered to the texture we might have written A values != 1. |
| * By sampling the texture with a ".xyz1" swizzle we'll get the expected A=1. |
| * This function computes the texture swizzle needed to get the expected |
| * values. |
| * |
| * In the case of depth textures, the GL_DEPTH_MODE state determines the |
| * texture swizzle. |
| * |
| * This result must be composed with the user-specified swizzle to get |
| * the final swizzle. |
| */ |
| static unsigned |
| compute_texture_format_swizzle(GLenum baseFormat, GLenum depthMode, |
| bool glsl130_or_later) |
| { |
| switch (baseFormat) { |
| case GL_RGBA: |
| return SWIZZLE_XYZW; |
| case GL_RGB: |
| return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_ONE); |
| case GL_RG: |
| return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_ZERO, SWIZZLE_ONE); |
| case GL_RED: |
| return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_ZERO, |
| SWIZZLE_ZERO, SWIZZLE_ONE); |
| case GL_ALPHA: |
| return MAKE_SWIZZLE4(SWIZZLE_ZERO, SWIZZLE_ZERO, |
| SWIZZLE_ZERO, SWIZZLE_W); |
| case GL_LUMINANCE: |
| return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_ONE); |
| case GL_LUMINANCE_ALPHA: |
| return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_W); |
| case GL_INTENSITY: |
| return SWIZZLE_XXXX; |
| case GL_STENCIL_INDEX: |
| case GL_DEPTH_STENCIL: |
| case GL_DEPTH_COMPONENT: |
| /* Now examine the depth mode */ |
| switch (depthMode) { |
| case GL_LUMINANCE: |
| return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_ONE); |
| case GL_INTENSITY: |
| return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_X); |
| case GL_ALPHA: |
| /* The texture(sampler*Shadow) functions from GLSL 1.30 ignore |
| * the depth mode and return float, while older shadow* functions |
| * and ARB_fp instructions return vec4 according to the depth mode. |
| * |
| * The problem with the GLSL 1.30 functions is that GL_ALPHA forces |
| * them to return 0, breaking them completely. |
| * |
| * A proper fix would increase code complexity and that's not worth |
| * it for a rarely used feature such as the GL_ALPHA depth mode |
| * in GL3. Therefore, change GL_ALPHA to GL_INTENSITY for all |
| * shaders that use GLSL 1.30 or later. |
| * |
| * BTW, it's required that sampler views are updated when |
| * shaders change (check_sampler_swizzle takes care of that). |
| */ |
| if (glsl130_or_later) |
| return SWIZZLE_XXXX; |
| else |
| return MAKE_SWIZZLE4(SWIZZLE_ZERO, SWIZZLE_ZERO, |
| SWIZZLE_ZERO, SWIZZLE_X); |
| case GL_RED: |
| return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_ZERO, |
| SWIZZLE_ZERO, SWIZZLE_ONE); |
| default: |
| assert(!"Unexpected depthMode"); |
| return SWIZZLE_XYZW; |
| } |
| default: |
| assert(!"Unexpected baseFormat"); |
| return SWIZZLE_XYZW; |
| } |
| } |
| |
| |
| static unsigned |
| get_texture_format_swizzle(const struct st_context *st, |
| const struct st_texture_object *stObj, |
| bool glsl130_or_later) |
| { |
| GLenum baseFormat = _mesa_base_tex_image(&stObj->base)->_BaseFormat; |
| unsigned tex_swizzle; |
| GLenum depth_mode = stObj->base.DepthMode; |
| |
| /* In ES 3.0, DEPTH_TEXTURE_MODE is expected to be GL_RED for textures |
| * with depth component data specified with a sized internal format. |
| */ |
| if (_mesa_is_gles3(st->ctx) && |
| (baseFormat == GL_DEPTH_COMPONENT || |
| baseFormat == GL_DEPTH_STENCIL || |
| baseFormat == GL_STENCIL_INDEX)) { |
| const struct gl_texture_image *firstImage = |
| _mesa_base_tex_image(&stObj->base); |
| if (firstImage->InternalFormat != GL_DEPTH_COMPONENT && |
| firstImage->InternalFormat != GL_DEPTH_STENCIL && |
| firstImage->InternalFormat != GL_STENCIL_INDEX) |
| depth_mode = GL_RED; |
| } |
| tex_swizzle = compute_texture_format_swizzle(baseFormat, |
| depth_mode, |
| glsl130_or_later); |
| |
| /* Combine the texture format swizzle with user's swizzle */ |
| return swizzle_swizzle(stObj->base._Swizzle, tex_swizzle); |
| } |
| |
| |
| /** |
| * Return TRUE if the texture's sampler view swizzle is not equal to |
| * the texture's swizzle. |
| * |
| * \param stObj the st texture object, |
| */ |
| ASSERTED static boolean |
| check_sampler_swizzle(const struct st_context *st, |
| const struct st_texture_object *stObj, |
| const struct pipe_sampler_view *sv, |
| bool glsl130_or_later) |
| { |
| unsigned swizzle = get_texture_format_swizzle(st, stObj, glsl130_or_later); |
| |
| return ((sv->swizzle_r != GET_SWZ(swizzle, 0)) || |
| (sv->swizzle_g != GET_SWZ(swizzle, 1)) || |
| (sv->swizzle_b != GET_SWZ(swizzle, 2)) || |
| (sv->swizzle_a != GET_SWZ(swizzle, 3))); |
| } |
| |
| |
| static unsigned |
| last_level(const struct st_texture_object *stObj) |
| { |
| unsigned ret = MIN2(stObj->base.MinLevel + stObj->base._MaxLevel, |
| stObj->pt->last_level); |
| if (stObj->base.Immutable) |
| ret = MIN2(ret, stObj->base.MinLevel + stObj->base.NumLevels - 1); |
| return ret; |
| } |
| |
| |
| static unsigned |
| last_layer(const struct st_texture_object *stObj) |
| { |
| if (stObj->base.Immutable && stObj->pt->array_size > 1) |
| return MIN2(stObj->base.MinLayer + stObj->base.NumLayers - 1, |
| stObj->pt->array_size - 1); |
| return stObj->pt->array_size - 1; |
| } |
| |
| |
| /** |
| * Determine the format for the texture sampler view. |
| */ |
| static enum pipe_format |
| get_sampler_view_format(struct st_context *st, |
| const struct st_texture_object *stObj, |
| bool srgb_skip_decode) |
| { |
| enum pipe_format format; |
| |
| GLenum baseFormat = _mesa_base_tex_image(&stObj->base)->_BaseFormat; |
| format = stObj->surface_based ? stObj->surface_format : stObj->pt->format; |
| |
| if (baseFormat == GL_DEPTH_COMPONENT || |
| baseFormat == GL_DEPTH_STENCIL || |
| baseFormat == GL_STENCIL_INDEX) { |
| if (stObj->base.StencilSampling || baseFormat == GL_STENCIL_INDEX) |
| format = util_format_stencil_only(format); |
| |
| return format; |
| } |
| |
| /* If sRGB decoding is off, use the linear format */ |
| if (srgb_skip_decode) |
| format = util_format_linear(format); |
| |
| /* if resource format matches then YUV wasn't lowered */ |
| if (format == stObj->pt->format) |
| return format; |
| |
| /* Use R8_UNORM for video formats */ |
| switch (format) { |
| case PIPE_FORMAT_NV12: |
| case PIPE_FORMAT_IYUV: |
| format = PIPE_FORMAT_R8_UNORM; |
| break; |
| case PIPE_FORMAT_P010: |
| case PIPE_FORMAT_P016: |
| format = PIPE_FORMAT_R16_UNORM; |
| break; |
| case PIPE_FORMAT_YUYV: |
| case PIPE_FORMAT_UYVY: |
| format = PIPE_FORMAT_R8G8_UNORM; |
| break; |
| case PIPE_FORMAT_AYUV: |
| format = PIPE_FORMAT_RGBA8888_UNORM; |
| break; |
| case PIPE_FORMAT_XYUV: |
| format = PIPE_FORMAT_RGBX8888_UNORM; |
| break; |
| default: |
| break; |
| } |
| return format; |
| } |
| |
| |
| static struct pipe_sampler_view * |
| st_create_texture_sampler_view_from_stobj(struct st_context *st, |
| struct st_texture_object *stObj, |
| enum pipe_format format, |
| bool glsl130_or_later) |
| { |
| /* There is no need to clear this structure (consider CPU overhead). */ |
| struct pipe_sampler_view templ; |
| unsigned swizzle = get_texture_format_swizzle(st, stObj, glsl130_or_later); |
| |
| templ.format = format; |
| |
| if (stObj->level_override >= 0) { |
| templ.u.tex.first_level = templ.u.tex.last_level = stObj->level_override; |
| } else { |
| templ.u.tex.first_level = stObj->base.MinLevel + stObj->base.BaseLevel; |
| templ.u.tex.last_level = last_level(stObj); |
| } |
| if (stObj->layer_override >= 0) { |
| templ.u.tex.first_layer = templ.u.tex.last_layer = stObj->layer_override; |
| } else { |
| templ.u.tex.first_layer = stObj->base.MinLayer; |
| templ.u.tex.last_layer = last_layer(stObj); |
| } |
| assert(templ.u.tex.first_layer <= templ.u.tex.last_layer); |
| assert(templ.u.tex.first_level <= templ.u.tex.last_level); |
| templ.target = gl_target_to_pipe(stObj->base.Target); |
| |
| templ.swizzle_r = GET_SWZ(swizzle, 0); |
| templ.swizzle_g = GET_SWZ(swizzle, 1); |
| templ.swizzle_b = GET_SWZ(swizzle, 2); |
| templ.swizzle_a = GET_SWZ(swizzle, 3); |
| |
| return st->pipe->create_sampler_view(st->pipe, stObj->pt, &templ); |
| } |
| |
| |
| struct pipe_sampler_view * |
| st_get_texture_sampler_view_from_stobj(struct st_context *st, |
| struct st_texture_object *stObj, |
| const struct gl_sampler_object *samp, |
| bool glsl130_or_later, |
| bool ignore_srgb_decode) |
| { |
| const struct st_sampler_view *sv; |
| bool srgb_skip_decode = false; |
| |
| if (!ignore_srgb_decode && samp->sRGBDecode == GL_SKIP_DECODE_EXT) |
| srgb_skip_decode = true; |
| |
| sv = st_texture_get_current_sampler_view(st, stObj); |
| |
| if (sv && |
| sv->glsl130_or_later == glsl130_or_later && |
| sv->srgb_skip_decode == srgb_skip_decode) { |
| /* Debug check: make sure that the sampler view's parameters are |
| * what they're supposed to be. |
| */ |
| struct pipe_sampler_view *view = sv->view; |
| assert(stObj->pt == view->texture); |
| assert(!check_sampler_swizzle(st, stObj, view, glsl130_or_later)); |
| assert(get_sampler_view_format(st, stObj, srgb_skip_decode) == view->format); |
| assert(gl_target_to_pipe(stObj->base.Target) == view->target); |
| assert(stObj->level_override >= 0 || |
| stObj->base.MinLevel + stObj->base.BaseLevel == view->u.tex.first_level); |
| assert(stObj->level_override >= 0 || last_level(stObj) == view->u.tex.last_level); |
| assert(stObj->layer_override >= 0 || stObj->base.MinLayer == view->u.tex.first_layer); |
| assert(stObj->layer_override >= 0 || last_layer(stObj) == view->u.tex.last_layer); |
| assert(stObj->layer_override < 0 || |
| (stObj->layer_override == view->u.tex.first_layer && |
| stObj->layer_override == view->u.tex.last_layer)); |
| return view; |
| } |
| |
| /* create new sampler view */ |
| enum pipe_format format = get_sampler_view_format(st, stObj, |
| srgb_skip_decode); |
| struct pipe_sampler_view *view = |
| st_create_texture_sampler_view_from_stobj(st, stObj, format, |
| glsl130_or_later); |
| |
| view = st_texture_set_sampler_view(st, stObj, view, |
| glsl130_or_later, srgb_skip_decode); |
| |
| return view; |
| } |
| |
| |
| struct pipe_sampler_view * |
| st_get_buffer_sampler_view_from_stobj(struct st_context *st, |
| struct st_texture_object *stObj) |
| { |
| const struct st_sampler_view *sv; |
| struct st_buffer_object *stBuf = |
| st_buffer_object(stObj->base.BufferObject); |
| |
| if (!stBuf || !stBuf->buffer) |
| return NULL; |
| |
| sv = st_texture_get_current_sampler_view(st, stObj); |
| |
| struct pipe_resource *buf = stBuf->buffer; |
| |
| if (sv) { |
| struct pipe_sampler_view *view = sv->view; |
| |
| if (view->texture == buf) { |
| /* Debug check: make sure that the sampler view's parameters are |
| * what they're supposed to be. |
| */ |
| assert(st_mesa_format_to_pipe_format(st, |
| stObj->base._BufferObjectFormat) |
| == view->format); |
| assert(view->target == PIPE_BUFFER); |
| ASSERTED unsigned base = stObj->base.BufferOffset; |
| ASSERTED unsigned size = MIN2(buf->width0 - base, |
| (unsigned) stObj->base.BufferSize); |
| assert(view->u.buf.offset == base); |
| assert(view->u.buf.size == size); |
| return view; |
| } |
| } |
| |
| unsigned base = stObj->base.BufferOffset; |
| |
| if (base >= buf->width0) |
| return NULL; |
| |
| unsigned size = buf->width0 - base; |
| size = MIN2(size, (unsigned)stObj->base.BufferSize); |
| if (!size) |
| return NULL; |
| |
| /* Create a new sampler view. There is no need to clear the entire |
| * structure (consider CPU overhead). |
| */ |
| struct pipe_sampler_view templ; |
| |
| templ.format = |
| st_mesa_format_to_pipe_format(st, stObj->base._BufferObjectFormat); |
| templ.target = PIPE_BUFFER; |
| templ.swizzle_r = PIPE_SWIZZLE_X; |
| templ.swizzle_g = PIPE_SWIZZLE_Y; |
| templ.swizzle_b = PIPE_SWIZZLE_Z; |
| templ.swizzle_a = PIPE_SWIZZLE_W; |
| templ.u.buf.offset = base; |
| templ.u.buf.size = size; |
| |
| struct pipe_sampler_view *view = |
| st->pipe->create_sampler_view(st->pipe, buf, &templ); |
| |
| view = st_texture_set_sampler_view(st, stObj, view, false, false); |
| |
| return view; |
| } |
