diff options
Diffstat (limited to 'xorg-server/glamor/glamor_vbo.c')
| -rw-r--r-- | xorg-server/glamor/glamor_vbo.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/xorg-server/glamor/glamor_vbo.c b/xorg-server/glamor/glamor_vbo.c new file mode 100644 index 000000000..5e98bfe47 --- /dev/null +++ b/xorg-server/glamor/glamor_vbo.c @@ -0,0 +1,186 @@ +/* + * Copyright © 2014 Intel Corporation + * + * 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, sublicense, + * 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 NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS 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. + */ + +/** + * @file glamor_vbo.c + * + * Helpers for managing streamed vertex bufffers used in glamor. + */ + +#include "glamor_priv.h" + +/** Default size of the VBO, in bytes. + * + * If a single request is larger than this size, we'll resize the VBO + * and return an appropriate mapping, but we'll resize back down after + * that to avoid hogging that memory forever. We don't anticipate + * normal usage actually requiring larger VBO sizes. + */ +#define GLAMOR_VBO_SIZE (512 * 1024) + +/** + * Returns a pointer to @size bytes of VBO storage, which should be + * accessed by the GL using vbo_offset within the VBO. + */ +void * +glamor_get_vbo_space(ScreenPtr screen, unsigned size, char **vbo_offset) +{ + glamor_screen_private *glamor_priv = glamor_get_screen_private(screen); + void *data; + + glamor_get_context(glamor_priv); + + glBindBuffer(GL_ARRAY_BUFFER, glamor_priv->vbo); + + if (glamor_priv->has_buffer_storage) { + if (glamor_priv->vbo_size < glamor_priv->vbo_offset + size) { + if (glamor_priv->vbo_size) + glUnmapBuffer(GL_ARRAY_BUFFER); + + if (size > glamor_priv->vbo_size) { + glamor_priv->vbo_size = MAX(GLAMOR_VBO_SIZE, size); + + /* We aren't allowed to resize glBufferStorage() + * buffers, so we need to gen a new one. + */ + glDeleteBuffers(1, &glamor_priv->vbo); + glGenBuffers(1, &glamor_priv->vbo); + glBindBuffer(GL_ARRAY_BUFFER, glamor_priv->vbo); + + assert(glGetError() == GL_NO_ERROR); + glBufferStorage(GL_ARRAY_BUFFER, glamor_priv->vbo_size, NULL, + GL_MAP_WRITE_BIT | + GL_MAP_PERSISTENT_BIT | + GL_MAP_COHERENT_BIT); + + if (glGetError() != GL_NO_ERROR) { + /* If the driver failed our coherent mapping, fall + * back to the ARB_mbr path. + */ + glamor_priv->has_buffer_storage = false; + glamor_priv->vbo_size = 0; + glamor_put_context(glamor_priv); + + return glamor_get_vbo_space(screen, size, vbo_offset); + } + } + + glamor_priv->vbo_offset = 0; + glamor_priv->vb = glMapBufferRange(GL_ARRAY_BUFFER, + 0, glamor_priv->vbo_size, + GL_MAP_WRITE_BIT | + GL_MAP_INVALIDATE_BUFFER_BIT | + GL_MAP_PERSISTENT_BIT | + GL_MAP_COHERENT_BIT); + } + *vbo_offset = (void *)(uintptr_t)glamor_priv->vbo_offset; + data = glamor_priv->vb + glamor_priv->vbo_offset; + glamor_priv->vbo_offset += size; + } else if (glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP) { + if (glamor_priv->vbo_size < glamor_priv->vbo_offset + size) { + glamor_priv->vbo_size = MAX(GLAMOR_VBO_SIZE, size); + glamor_priv->vbo_offset = 0; + glBufferData(GL_ARRAY_BUFFER, + glamor_priv->vbo_size, NULL, GL_STREAM_DRAW); + } + + data = glMapBufferRange(GL_ARRAY_BUFFER, + glamor_priv->vbo_offset, + size, + GL_MAP_WRITE_BIT | + GL_MAP_UNSYNCHRONIZED_BIT | + GL_MAP_INVALIDATE_RANGE_BIT); + assert(data != NULL); + *vbo_offset = (char *)(uintptr_t)glamor_priv->vbo_offset; + glamor_priv->vbo_offset += size; + } else { + /* Return a pointer to the statically allocated non-VBO + * memory. We'll upload it through glBufferData() later. + */ + if (glamor_priv->vbo_size < size) { + glamor_priv->vbo_size = MAX(GLAMOR_VBO_SIZE, size); + free(glamor_priv->vb); + glamor_priv->vb = XNFalloc(size); + } + *vbo_offset = NULL; + /* We point to the start of glamor_priv->vb every time, and + * the vbo_offset determines the size of the glBufferData(). + */ + glamor_priv->vbo_offset = size; + data = glamor_priv->vb; + } + + glamor_put_context(glamor_priv); + + return data; +} + +void +glamor_put_vbo_space(ScreenPtr screen) +{ + glamor_screen_private *glamor_priv = glamor_get_screen_private(screen); + + glamor_get_context(glamor_priv); + + if (glamor_priv->has_buffer_storage) { + /* If we're in the ARB_buffer_storage path, we have a + * persistent mapping, so we can leave it around until we + * reach the end of the buffer. + */ + } else if (glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP) { + glUnmapBuffer(GL_ARRAY_BUFFER); + } else { + glBufferData(GL_ARRAY_BUFFER, glamor_priv->vbo_offset, + glamor_priv->vb, GL_DYNAMIC_DRAW); + } + + glBindBuffer(GL_ARRAY_BUFFER, 0); + + glamor_put_context(glamor_priv); +} + +void +glamor_init_vbo(ScreenPtr screen) +{ + glamor_screen_private *glamor_priv = glamor_get_screen_private(screen); + + glamor_get_context(glamor_priv); + + glGenBuffers(1, &glamor_priv->vbo); + + glamor_put_context(glamor_priv); +} + +void +glamor_fini_vbo(ScreenPtr screen) +{ + glamor_screen_private *glamor_priv = glamor_get_screen_private(screen); + + glamor_get_context(glamor_priv); + + glDeleteBuffers(1, &glamor_priv->vbo); + if (glamor_priv->gl_flavor != GLAMOR_GL_DESKTOP) + free(glamor_priv->vb); + + glamor_put_context(glamor_priv); +} |