Mesa (master): st/osmesa: new OSMesa gallium state tracker
Brian Paul
brianp at kemper.freedesktop.org
Wed Mar 13 01:09:59 UTC 2013
Module: Mesa
Branch: master
Commit: 73436a909e9ca3312ad506e2b765a4f51858b05e
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=73436a909e9ca3312ad506e2b765a4f51858b05e
Author: Brian Paul <brianp at vmware.com>
Date: Mon Mar 11 18:31:21 2013 -0600
st/osmesa: new OSMesa gallium state tracker
Reviewed-by: José Fonseca <jfonseca at vmware.com>
---
src/gallium/state_trackers/osmesa/osmesa.c | 793 ++++++++++++++++++++++++++++
1 files changed, 793 insertions(+), 0 deletions(-)
diff --git a/src/gallium/state_trackers/osmesa/osmesa.c b/src/gallium/state_trackers/osmesa/osmesa.c
new file mode 100644
index 0000000..35fa338
--- /dev/null
+++ b/src/gallium/state_trackers/osmesa/osmesa.c
@@ -0,0 +1,793 @@
+/*
+ * Copyright (c) 2013 Brian Paul 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, 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 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 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.
+ */
+
+
+/*
+ * Off-Screen rendering into client memory.
+ * State tracker for gallium (for softpipe and llvmpipe)
+ *
+ * Notes:
+ *
+ * If Gallium is built with LLVM support we use the llvmpipe driver.
+ * Otherwise we use softpipe. The GALLIUM_DRIVER environment variable
+ * may be set to "softpipe" or "llvmpipe" to override.
+ *
+ * With softpipe we could render directly into the user's buffer by using a
+ * display target resource. However, softpipe doesn't suport "upside-down"
+ * rendering which would be needed for the OSMESA_Y_UP=TRUE case.
+ *
+ * With llvmpipe we could only render directly into the user's buffer when its
+ * width and height is a multiple of the tile size (64 pixels).
+ *
+ * Because of these constraints we always render into ordinary resources then
+ * copy the results to the user's buffer in the flush_front() function which
+ * is called when the app calls glFlush/Finish.
+ *
+ * In general, the OSMesa interface is pretty ugly and not a good match
+ * for Gallium. But we're interested in doing the best we can to preserve
+ * application portability. With a little work we could come up with a
+ * much nicer, new off-screen Gallium interface...
+ */
+
+
+#include "GL/osmesa.h"
+
+#include "glapi/glapi.h" /* for OSMesaGetProcAddress below */
+
+#include "pipe/p_context.h"
+#include "pipe/p_screen.h"
+#include "pipe/p_state.h"
+
+#include "util/u_atomic.h"
+#include "util/u_box.h"
+#include "util/u_format.h"
+#include "util/u_memory.h"
+
+#include "state_tracker/st_api.h"
+#include "state_tracker/st_gl_api.h"
+
+
+
+extern struct pipe_screen *
+osmesa_create_screen(void);
+
+
+
+struct osmesa_buffer
+{
+ struct st_framebuffer_iface *stfb;
+ struct st_visual visual;
+ unsigned width, height;
+
+ struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
+
+ void *map;
+};
+
+
+struct osmesa_context
+{
+ struct st_context_iface *stctx;
+
+ struct osmesa_buffer *current_buffer;
+
+ enum pipe_format depth_stencil_format, accum_format;
+
+ GLenum format; /*< User-specified context format */
+ GLenum type; /*< Buffer's data type */
+ GLint user_row_length; /*< user-specified number of pixels per row */
+ GLboolean y_up; /*< TRUE -> Y increases upward */
+ /*< FALSE -> Y increases downward */
+};
+
+
+
+/**
+ * Called from the ST manager.
+ */
+static int
+osmesa_st_get_param(struct st_manager *smapi, enum st_manager_param param)
+{
+ /* no-op */
+ return 0;
+}
+
+
+/**
+ * Create/return singleton st_api object.
+ */
+static struct st_api *
+get_st_api(void)
+{
+ static struct st_api *stapi = NULL;
+ if (!stapi) {
+ stapi = st_gl_api_create();
+ }
+ return stapi;
+}
+
+
+/**
+ * Create/return a singleton st_manager object.
+ */
+static struct st_manager *
+get_st_manager(void)
+{
+ static struct st_manager *stmgr = NULL;
+ if (!stmgr) {
+ stmgr = CALLOC_STRUCT(st_manager);
+ if (stmgr) {
+ stmgr->screen = osmesa_create_screen();
+ stmgr->get_param = osmesa_st_get_param;
+ stmgr->get_egl_image = NULL;
+ }
+ }
+ return stmgr;
+}
+
+
+static INLINE boolean
+little_endian(void)
+{
+ const unsigned ui = 1;
+ return *((const char *) &ui);
+}
+
+
+/**
+ * Given an OSMESA_x format and a GL_y type, return the best
+ * matching PIPE_FORMAT_z.
+ * Note that we can't exactly match all user format/type combinations
+ * with gallium formats. If we find this to be a problem, we can
+ * implement more elaborate format/type conversion in the flush_front()
+ * function.
+ */
+static enum pipe_format
+osmesa_choose_format(GLenum format, GLenum type)
+{
+ switch (format) {
+ case OSMESA_RGBA:
+ if (type == GL_UNSIGNED_BYTE) {
+ if (little_endian())
+ return PIPE_FORMAT_R8G8B8A8_UNORM;
+ else
+ return PIPE_FORMAT_A8B8G8R8_UNORM;
+ }
+ else if (type == GL_UNSIGNED_SHORT) {
+ return PIPE_FORMAT_R16G16B16A16_UNORM;
+ }
+ else if (type == GL_FLOAT) {
+ return PIPE_FORMAT_R32G32B32A32_FLOAT;
+ }
+ else {
+ return PIPE_FORMAT_NONE;
+ }
+ break;
+ case OSMESA_BGRA:
+ if (type == GL_UNSIGNED_BYTE) {
+ if (little_endian())
+ return PIPE_FORMAT_B8G8R8A8_UNORM;
+ else
+ return PIPE_FORMAT_A8R8G8B8_UNORM;
+ }
+ else if (type == GL_UNSIGNED_SHORT) {
+ return PIPE_FORMAT_R16G16B16A16_UNORM;
+ }
+ else if (type == GL_FLOAT) {
+ return PIPE_FORMAT_R32G32B32A32_FLOAT;
+ }
+ else {
+ return PIPE_FORMAT_NONE;
+ }
+ break;
+ case OSMESA_ARGB:
+ if (type == GL_UNSIGNED_BYTE) {
+ if (little_endian())
+ return PIPE_FORMAT_A8R8G8B8_UNORM;
+ else
+ return PIPE_FORMAT_B8G8R8A8_UNORM;
+ }
+ else if (type == GL_UNSIGNED_SHORT) {
+ return PIPE_FORMAT_R16G16B16A16_UNORM;
+ }
+ else if (type == GL_FLOAT) {
+ return PIPE_FORMAT_R32G32B32A32_FLOAT;
+ }
+ else {
+ return PIPE_FORMAT_NONE;
+ }
+ break;
+ case OSMESA_RGB:
+ if (type == GL_UNSIGNED_BYTE) {
+ return PIPE_FORMAT_R8G8B8_UNORM;
+ }
+ else if (type == GL_UNSIGNED_SHORT) {
+ return PIPE_FORMAT_R16G16B16_UNORM;
+ }
+ else if (type == GL_FLOAT) {
+ return PIPE_FORMAT_R32G32B32_FLOAT;
+ }
+ else {
+ return PIPE_FORMAT_NONE;
+ }
+ break;
+ case OSMESA_BGR:
+ /* No gallium format for this one */
+ return PIPE_FORMAT_NONE;
+ case OSMESA_RGB_565:
+ return PIPE_FORMAT_B5G6R5_UNORM;
+ default:
+ ; /* fall-through */
+ }
+ return PIPE_FORMAT_NONE;
+}
+
+
+/**
+ * Initialize an st_visual object.
+ */
+static void
+osmesa_init_st_visual(struct st_visual *vis,
+ enum pipe_format color_format,
+ enum pipe_format ds_format,
+ enum pipe_format accum_format)
+{
+ vis->buffer_mask = ST_ATTACHMENT_FRONT_LEFT_MASK;
+ vis->color_format = color_format;
+ vis->depth_stencil_format = ds_format;
+ vis->accum_format = accum_format;
+ vis->samples = 1;
+ vis->render_buffer = ST_ATTACHMENT_FRONT_LEFT;
+}
+
+
+/**
+ * Return the osmesa_buffer that corresponds to an st_framebuffer_iface.
+ */
+static INLINE struct osmesa_buffer *
+stfbi_to_osbuffer(struct st_framebuffer_iface *stfbi)
+{
+ return (struct osmesa_buffer *) stfbi->st_manager_private;
+}
+
+
+/**
+ * Called via glFlush/glFinish. This is where we copy the contents
+ * of the driver's color buffer into the user-specified buffer.
+ */
+static boolean
+osmesa_st_framebuffer_flush_front(struct st_context_iface *stctx,
+ struct st_framebuffer_iface *stfbi,
+ enum st_attachment_type statt)
+{
+ OSMesaContext osmesa = OSMesaGetCurrentContext();
+ struct osmesa_buffer *osbuffer = stfbi_to_osbuffer(stfbi);
+ struct pipe_context *pipe = stctx->pipe;
+ struct pipe_resource *res = osbuffer->textures[statt];
+ struct pipe_transfer *transfer = NULL;
+ struct pipe_box box;
+ void *map;
+ ubyte *src, *dst;
+ unsigned y, bytes, bpp;
+ int dst_stride;
+
+ u_box_2d(0, 0, res->width0, res->height0, &box);
+
+ map = pipe->transfer_map(pipe, res, 0, PIPE_TRANSFER_READ, &box,
+ &transfer);
+
+ /*
+ * Copy the color buffer from the resource to the user's buffer.
+ */
+ bpp = util_format_get_blocksize(osbuffer->visual.color_format);
+ src = map;
+ dst = osbuffer->map;
+ if (osmesa->user_row_length)
+ dst_stride = bpp * osmesa->user_row_length;
+ else
+ dst_stride = bpp * osbuffer->width;
+ bytes = bpp * res->width0;
+
+ if (osmesa->y_up) {
+ /* need to flip image upside down */
+ dst = dst + (res->height0 - 1) * dst_stride;
+ dst_stride = -dst_stride;
+ }
+
+ for (y = 0; y < res->height0; y++) {
+ memcpy(dst, src, bytes);
+ dst += dst_stride;
+ src += transfer->stride;
+ }
+
+ pipe->transfer_unmap(pipe, transfer);
+
+ return TRUE;
+}
+
+
+/**
+ * Called by the st manager to validate the framebuffer (allocate
+ * its resources).
+ */
+static boolean
+osmesa_st_framebuffer_validate(struct st_framebuffer_iface *stfbi,
+ const enum st_attachment_type *statts,
+ unsigned count,
+ struct pipe_resource **out)
+{
+ struct pipe_screen *screen = get_st_manager()->screen;
+ enum st_attachment_type i;
+ struct osmesa_buffer *osbuffer = stfbi_to_osbuffer(stfbi);
+ struct pipe_resource templat;
+
+ memset(&templat, 0, sizeof(templat));
+ templat.target = PIPE_TEXTURE_RECT;
+ templat.format = 0; /* setup below */
+ templat.last_level = 0;
+ templat.width0 = osbuffer->width;
+ templat.height0 = osbuffer->height;
+ templat.depth0 = 1;
+ templat.array_size = 1;
+ templat.usage = PIPE_USAGE_DEFAULT;
+ templat.bind = 0; /* setup below */
+ templat.flags = 0;
+
+ for (i = 0; i < count; i++) {
+ enum pipe_format format;
+ unsigned bind;
+
+ /*
+ * At this time, we really only need to handle the front-left color
+ * attachment, since that's all we specified for the visual in
+ * osmesa_init_st_visual().
+ */
+ if (statts[i] == ST_ATTACHMENT_FRONT_LEFT) {
+ format = osbuffer->visual.color_format;
+ bind = PIPE_BIND_RENDER_TARGET;
+ }
+ else if (statts[i] == ST_ATTACHMENT_DEPTH_STENCIL) {
+ format = osbuffer->visual.depth_stencil_format;
+ bind = PIPE_BIND_DEPTH_STENCIL;
+ }
+ else if (statts[i] == ST_ATTACHMENT_ACCUM) {
+ format = osbuffer->visual.accum_format;
+ bind = PIPE_BIND_RENDER_TARGET;
+ }
+
+ templat.format = format;
+ templat.bind = bind;
+ out[i] = osbuffer->textures[i] =
+ screen->resource_create(screen, &templat);
+ }
+
+ return TRUE;
+}
+
+
+static struct st_framebuffer_iface *
+osmesa_create_st_framebuffer(void)
+{
+ struct st_framebuffer_iface *stfbi = CALLOC_STRUCT(st_framebuffer_iface);
+ if (stfbi) {
+ stfbi->flush_front = osmesa_st_framebuffer_flush_front;
+ stfbi->validate = osmesa_st_framebuffer_validate;
+ p_atomic_set(&stfbi->stamp, 1);
+ }
+ return stfbi;
+}
+
+
+static struct osmesa_buffer *
+osmesa_create_buffer(enum pipe_format color_format,
+ enum pipe_format ds_format,
+ enum pipe_format accum_format)
+{
+ struct osmesa_buffer *osbuffer = CALLOC_STRUCT(osmesa_buffer);
+ if (osbuffer) {
+ osbuffer->stfb = osmesa_create_st_framebuffer();
+
+ osbuffer->stfb->st_manager_private = osbuffer;
+ osbuffer->stfb->visual = &osbuffer->visual;
+
+ osmesa_init_st_visual(&osbuffer->visual, color_format,
+ ds_format, accum_format);
+ }
+ return osbuffer;
+}
+
+
+static void
+osmesa_destroy_buffer(struct osmesa_buffer *osbuffer)
+{
+ FREE(osbuffer->stfb);
+ FREE(osbuffer);
+}
+
+
+
+/**********************************************************************/
+/***** Public Functions *****/
+/**********************************************************************/
+
+
+/**
+ * Create an Off-Screen Mesa rendering context. The only attribute needed is
+ * an RGBA vs Color-Index mode flag.
+ *
+ * Input: format - Must be GL_RGBA
+ * sharelist - specifies another OSMesaContext with which to share
+ * display lists. NULL indicates no sharing.
+ * Return: an OSMesaContext or 0 if error
+ */
+GLAPI OSMesaContext GLAPIENTRY
+OSMesaCreateContext(GLenum format, OSMesaContext sharelist)
+{
+ return OSMesaCreateContextExt(format, 24, 8, 0, sharelist);
+}
+
+
+/**
+ * New in Mesa 3.5
+ *
+ * Create context and specify size of ancillary buffers.
+ */
+GLAPI OSMesaContext GLAPIENTRY
+OSMesaCreateContextExt(GLenum format, GLint depthBits, GLint stencilBits,
+ GLint accumBits, OSMesaContext sharelist)
+{
+ OSMesaContext osmesa;
+ struct st_context_iface *st_shared;
+ enum st_context_error st_error = 0;
+ struct st_context_attribs attribs;
+ struct st_api *stapi = get_st_api();
+
+ if (sharelist) {
+ st_shared = sharelist->stctx;
+ }
+ else {
+ st_shared = NULL;
+ }
+
+ osmesa = (OSMesaContext) CALLOC_STRUCT(osmesa_context);
+ if (!osmesa)
+ return NULL;
+
+ /* Choose depth/stencil/accum buffer formats */
+ if (accumBits > 0) {
+ osmesa->accum_format = PIPE_FORMAT_R16G16B16A16_SNORM;
+ }
+ if (depthBits > 0 && stencilBits > 0) {
+ osmesa->depth_stencil_format = PIPE_FORMAT_Z24_UNORM_S8_UINT;
+ }
+ else if (stencilBits > 0) {
+ osmesa->depth_stencil_format = PIPE_FORMAT_S8_UINT;
+ }
+ else if (depthBits >= 24) {
+ osmesa->depth_stencil_format = PIPE_FORMAT_Z24X8_UNORM;
+ }
+ else if (depthBits >= 16) {
+ osmesa->depth_stencil_format = PIPE_FORMAT_Z16_UNORM;
+ }
+
+ /*
+ * Create the rendering context
+ */
+ attribs.profile = ST_PROFILE_DEFAULT;
+ attribs.major = 2;
+ attribs.minor = 1;
+ attribs.flags = 0; /* ST_CONTEXT_FLAG_x */
+ attribs.options.force_glsl_extensions_warn = FALSE;
+
+ osmesa_init_st_visual(&attribs.visual,
+ PIPE_FORMAT_R8G8B8A8_UNORM,
+ osmesa->depth_stencil_format,
+ osmesa->accum_format);
+
+ osmesa->stctx = stapi->create_context(stapi, get_st_manager(),
+ &attribs, &st_error, st_shared);
+ if (!osmesa->stctx) {
+ FREE(osmesa);
+ return NULL;
+ }
+
+ osmesa->stctx->st_manager_private = osmesa;
+
+ osmesa->format = format;
+ osmesa->user_row_length = 0;
+ osmesa->y_up = GL_TRUE;
+
+ return osmesa;
+}
+
+
+/**
+ * Destroy an Off-Screen Mesa rendering context.
+ *
+ * \param osmesa the context to destroy
+ */
+GLAPI void GLAPIENTRY
+OSMesaDestroyContext(OSMesaContext osmesa)
+{
+ if (osmesa) {
+ osmesa->stctx->destroy(osmesa->stctx);
+ FREE(osmesa);
+ }
+}
+
+
+/**
+ * Bind an OSMesaContext to an image buffer. The image buffer is just a
+ * block of memory which the client provides. Its size must be at least
+ * as large as width*height*pixelSize. Its address should be a multiple
+ * of 4 if using RGBA mode.
+ *
+ * By default, image data is stored in the order of glDrawPixels: row-major
+ * order with the lower-left image pixel stored in the first array position
+ * (ie. bottom-to-top).
+ *
+ * If the context's viewport hasn't been initialized yet, it will now be
+ * initialized to (0,0,width,height).
+ *
+ * Input: osmesa - the rendering context
+ * buffer - the image buffer memory
+ * type - data type for pixel components
+ * GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT
+ * or GL_FLOAT.
+ * width, height - size of image buffer in pixels, at least 1
+ * Return: GL_TRUE if success, GL_FALSE if error because of invalid osmesa,
+ * invalid type, invalid size, etc.
+ */
+GLAPI GLboolean GLAPIENTRY
+OSMesaMakeCurrent(OSMesaContext osmesa, void *buffer, GLenum type,
+ GLsizei width, GLsizei height)
+{
+ struct st_api *stapi = get_st_api();
+ struct osmesa_buffer *osbuffer;
+ enum pipe_format color_format;
+
+ if (osmesa->format == OSMESA_RGB_565 && type != GL_UNSIGNED_SHORT_5_6_5) {
+ return GL_FALSE;
+ }
+ if (width < 1 || height < 1) {
+ return GL_FALSE;
+ }
+
+ color_format = osmesa_choose_format(osmesa->format, type);
+ if (color_format == PIPE_FORMAT_NONE) {
+ fprintf(stderr, "OSMesaMakeCurrent(unsupported format/type)\n");
+ return GL_FALSE;
+ }
+
+ osbuffer = osmesa_create_buffer(color_format,
+ osmesa->depth_stencil_format,
+ osmesa->accum_format);
+
+ osbuffer->width = width;
+ osbuffer->height = height;
+ osbuffer->map = buffer;
+
+ if (osmesa->current_buffer) {
+ /* free old buffer */
+ osmesa_destroy_buffer(osmesa->current_buffer);
+ }
+
+ osmesa->current_buffer = osbuffer;
+ osmesa->type = type;
+
+ stapi->make_current(stapi, osmesa->stctx, osbuffer->stfb, osbuffer->stfb);
+
+ return GL_TRUE;
+}
+
+
+
+GLAPI OSMesaContext GLAPIENTRY
+OSMesaGetCurrentContext(void)
+{
+ struct st_api *stapi = get_st_api();
+ struct st_context_iface *st = stapi->get_current(stapi);
+ return st ? (OSMesaContext) st->st_manager_private : NULL;
+}
+
+
+
+GLAPI void GLAPIENTRY
+OSMesaPixelStore(GLint pname, GLint value)
+{
+ OSMesaContext osmesa = OSMesaGetCurrentContext();
+
+ switch (pname) {
+ case OSMESA_ROW_LENGTH:
+ osmesa->user_row_length = value;
+ break;
+ case OSMESA_Y_UP:
+ osmesa->y_up = value ? GL_TRUE : GL_FALSE;
+ break;
+ default:
+ fprintf(stderr, "Invalid pname in OSMesaPixelStore()\n");
+ return;
+ }
+}
+
+
+GLAPI void GLAPIENTRY
+OSMesaGetIntegerv(GLint pname, GLint *value)
+{
+ OSMesaContext osmesa = OSMesaGetCurrentContext();
+ struct osmesa_buffer *osbuffer = osmesa ? osmesa->current_buffer : NULL;
+
+ switch (pname) {
+ case OSMESA_WIDTH:
+ *value = osbuffer ? osbuffer->width : 0;
+ return;
+ case OSMESA_HEIGHT:
+ *value = osbuffer ? osbuffer->height : 0;
+ return;
+ case OSMESA_FORMAT:
+ *value = osmesa->format;
+ return;
+ case OSMESA_TYPE:
+ /* current color buffer's data type */
+ *value = osmesa->type;
+ return;
+ case OSMESA_ROW_LENGTH:
+ *value = osmesa->user_row_length;
+ return;
+ case OSMESA_Y_UP:
+ *value = osmesa->y_up;
+ return;
+ case OSMESA_MAX_WIDTH:
+ /* fall-through */
+ case OSMESA_MAX_HEIGHT:
+ {
+ struct pipe_screen *screen = get_st_manager()->screen;
+ int maxLevels = screen->get_param(screen,
+ PIPE_CAP_MAX_TEXTURE_2D_LEVELS);
+ *value = 1 << (maxLevels - 1);
+ *value = 8 * 1024;
+ }
+ return;
+ default:
+ fprintf(stderr, "Invalid pname in OSMesaGetIntegerv()\n");
+ return;
+ }
+}
+
+
+/**
+ * Return information about the depth buffer associated with an OSMesa context.
+ * Input: c - the OSMesa context
+ * Output: width, height - size of buffer in pixels
+ * bytesPerValue - bytes per depth value (2 or 4)
+ * buffer - pointer to depth buffer values
+ * Return: GL_TRUE or GL_FALSE to indicate success or failure.
+ */
+GLAPI GLboolean GLAPIENTRY
+OSMesaGetDepthBuffer(OSMesaContext c, GLint *width, GLint *height,
+ GLint *bytesPerValue, void **buffer)
+{
+ struct osmesa_buffer *osbuffer = c->current_buffer;
+ struct pipe_context *pipe = c->stctx->pipe;
+ struct pipe_resource *res = osbuffer->textures[ST_ATTACHMENT_DEPTH_STENCIL];
+ struct pipe_transfer *transfer = NULL;
+ struct pipe_box box;
+
+ /*
+ * Note: we can't really implement this function with gallium as
+ * we did for swrast. We can't just map the resource and leave it
+ * mapped (and there's no OSMesaUnmapDepthBuffer() function) so
+ * we unmap the buffer here and return a 'stale' pointer. This should
+ * actually be OK in most cases where the caller of this function
+ * immediately uses the pointer.
+ */
+
+ u_box_2d(0, 0, res->width0, res->height0, &box);
+
+ *buffer = pipe->transfer_map(pipe, res, 0, PIPE_TRANSFER_READ, &box,
+ &transfer);
+ if (!*buffer) {
+ return GL_FALSE;
+ }
+
+ *width = res->width0;
+ *height = res->height0;
+ *bytesPerValue = util_format_get_blocksize(res->format);
+
+ pipe->transfer_unmap(pipe, transfer);
+
+ return GL_TRUE;
+}
+
+
+/**
+ * Return the color buffer associated with an OSMesa context.
+ * Input: c - the OSMesa context
+ * Output: width, height - size of buffer in pixels
+ * format - the pixel format (OSMESA_FORMAT)
+ * buffer - pointer to color buffer values
+ * Return: GL_TRUE or GL_FALSE to indicate success or failure.
+ */
+GLAPI GLboolean GLAPIENTRY
+OSMesaGetColorBuffer(OSMesaContext osmesa, GLint *width,
+ GLint *height, GLint *format, void **buffer)
+{
+ struct osmesa_buffer *osbuffer = osmesa->current_buffer;
+
+ if (osbuffer) {
+ *width = osbuffer->width;
+ *height = osbuffer->height;
+ *format = osmesa->format;
+ *buffer = osbuffer->map;
+ return GL_TRUE;
+ }
+ else {
+ *width = 0;
+ *height = 0;
+ *format = 0;
+ *buffer = 0;
+ return GL_FALSE;
+ }
+}
+
+
+struct name_function
+{
+ const char *Name;
+ OSMESAproc Function;
+};
+
+static struct name_function functions[] = {
+ { "OSMesaCreateContext", (OSMESAproc) OSMesaCreateContext },
+ { "OSMesaCreateContextExt", (OSMESAproc) OSMesaCreateContextExt },
+ { "OSMesaDestroyContext", (OSMESAproc) OSMesaDestroyContext },
+ { "OSMesaMakeCurrent", (OSMESAproc) OSMesaMakeCurrent },
+ { "OSMesaGetCurrentContext", (OSMESAproc) OSMesaGetCurrentContext },
+ { "OSMesaPixelsStore", (OSMESAproc) OSMesaPixelStore },
+ { "OSMesaGetIntegerv", (OSMESAproc) OSMesaGetIntegerv },
+ { "OSMesaGetDepthBuffer", (OSMESAproc) OSMesaGetDepthBuffer },
+ { "OSMesaGetColorBuffer", (OSMESAproc) OSMesaGetColorBuffer },
+ { "OSMesaGetProcAddress", (OSMESAproc) OSMesaGetProcAddress },
+ { "OSMesaColorClamp", (OSMESAproc) OSMesaColorClamp },
+ { NULL, NULL }
+};
+
+
+GLAPI OSMESAproc GLAPIENTRY
+OSMesaGetProcAddress(const char *funcName)
+{
+ int i;
+ for (i = 0; functions[i].Name; i++) {
+ if (strcmp(functions[i].Name, funcName) == 0)
+ return functions[i].Function;
+ }
+ return _glapi_get_proc_address(funcName);
+}
+
+
+GLAPI void GLAPIENTRY
+OSMesaColorClamp(GLboolean enable)
+{
+ extern void GLAPIENTRY _mesa_ClampColor(GLenum target, GLenum clamp);
+
+ _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR_ARB,
+ enable ? GL_TRUE : GL_FIXED_ONLY_ARB);
+}
More information about the mesa-commit
mailing list