osmesa: add support for postprocess filters

Add new OSMesaPostprocess() function to allow using the gallium
postprocessing filters.  This only works for OSMesa with gallium
drivers, not the legacy swrast OSMesa.

Bump OSMESA_MAJOR/MINOR_VERSION numbers to 10.0

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

include/GL/osmesa.h

@@ -60,8 +60,8 @@ extern "C" {
 #include <GL/gl.h>
 
 
-#define OSMESA_MAJOR_VERSION 6
-#define OSMESA_MINOR_VERSION 5
+#define OSMESA_MAJOR_VERSION 10
+#define OSMESA_MINOR_VERSION 0
 #define OSMESA_PATCH_VERSION 0
 
 
@@ -270,6 +270,21 @@ OSMesaGetProcAddress( const char *funcName );
 GLAPI void GLAPIENTRY
 OSMesaColorClamp(GLboolean enable);
 
+
+/**
+ * Enable/disable Gallium post-process filters.
+ * This should be called after a context is created, but before it is
+ * made current for the first time.  After a context has been made
+ * current, this function has no effect.
+ * If the enable_value param is zero, the filter is disabled.  Otherwise
+ * the filter is enabled, and the value may control the filter's quality.
+ * New in Mesa 10.0
+ */
+GLAPI void GLAPIENTRY
+OSMesaPostprocess(OSMesaContext osmesa, const char *filter,
+                  unsigned enable_value);
+
+
 #ifdef __cplusplus
 }
 #endif

src/gallium/state_trackers/osmesa/osmesa.c

@@ -59,9 +59,13 @@
 
 #include "util/u_atomic.h"
 #include "util/u_box.h"
+#include "util/u_debug.h"
 #include "util/u_format.h"
 #include "util/u_memory.h"
 
+#include "postprocess/filters.h"
+#include "postprocess/postprocess.h"
+
 #include "state_tracker/st_api.h"
 #include "state_tracker/st_gl_api.h"
 
@@ -90,6 +94,8 @@ struct osmesa_context
 {
    struct st_context_iface *stctx;
 
+   boolean ever_used;     /*< Has this context ever been current? */
+
    struct osmesa_buffer *current_buffer;
 
    enum pipe_format depth_stencil_format, accum_format;
@@ -99,6 +105,10 @@ struct osmesa_context
    GLint user_row_length; /*< user-specified number of pixels per row */
    GLboolean y_up;        /*< TRUE  -> Y increases upward */
                           /*< FALSE -> Y increases downward */
+
+   /** Which postprocessing filters are enabled. */
+   unsigned pp_enabled[PP_FILTERS];
+   struct pp_queue_t *pp;
 };
 
 
@@ -264,6 +274,12 @@ osmesa_init_st_visual(struct st_visual *vis,
                       enum pipe_format accum_format)
 {
    vis->buffer_mask = ST_ATTACHMENT_FRONT_LEFT_MASK;
+
+   if (ds_format != PIPE_FORMAT_NONE)
+      vis->buffer_mask |= ST_ATTACHMENT_DEPTH_STENCIL_MASK;
+   if (accum_format != PIPE_FORMAT_NONE)
+      vis->buffer_mask |= ST_ATTACHMENT_ACCUM;
+
    vis->color_format = color_format;
    vis->depth_stencil_format = ds_format;
    vis->accum_format = accum_format;
@@ -302,6 +318,28 @@ osmesa_st_framebuffer_flush_front(struct st_context_iface *stctx,
    unsigned y, bytes, bpp;
    int dst_stride;
 
+   if (osmesa->pp) {
+      struct pipe_resource *zsbuf = NULL;
+      unsigned i;
+
+      /* Find the z/stencil buffer if there is one */
+      for (i = 0; i < Elements(osbuffer->textures); i++) {
+         struct pipe_resource *res = osbuffer->textures[i];
+         if (res) {
+            const struct util_format_description *desc =
+               util_format_description(res->format);
+
+            if (util_format_has_depth(desc)) {
+               zsbuf = res;
+               break;
+            }
+         }
+      }
+
+      /* run the postprocess stage(s) */
+      pp_run(osmesa->pp, res, res, zsbuf);
+   }
+
    u_box_2d(0, 0, res->width0, res->height0, &box);
 
    map = pipe->transfer_map(pipe, res, 0, PIPE_TRANSFER_READ, &box,
@@ -581,6 +619,7 @@ GLAPI void GLAPIENTRY
 OSMesaDestroyContext(OSMesaContext osmesa)
 {
    if (osmesa) {
+      pp_free(osmesa->pp);
       osmesa->stctx->destroy(osmesa->stctx);
       FREE(osmesa);
    }
@@ -654,6 +693,29 @@ OSMesaMakeCurrent(OSMesaContext osmesa, void *buffer, GLenum type,
 
    stapi->make_current(stapi, osmesa->stctx, osbuffer->stfb, osbuffer->stfb);
 
+   if (!osmesa->ever_used) {
+      /* one-time init, just postprocessing for now */
+      boolean any_pp_enabled = FALSE;
+      unsigned i;
+
+      for (i = 0; i < Elements(osmesa->pp_enabled); i++) {
+         if (osmesa->pp_enabled[i]) {
+            any_pp_enabled = TRUE;
+            break;
+         }
+      }
+
+      if (any_pp_enabled) {
+         osmesa->pp = pp_init(osmesa->stctx->pipe,
+                              osmesa->pp_enabled,
+                              osmesa->stctx->cso_context);
+
+         pp_init_fbos(osmesa->pp, width, height);
+      }
+
+      osmesa->ever_used = TRUE;
+   }
+
    return GL_TRUE;
 }
 
@@ -826,6 +888,7 @@ static struct name_function functions[] = {
    { "OSMesaGetColorBuffer", (OSMESAproc) OSMesaGetColorBuffer },
    { "OSMesaGetProcAddress", (OSMESAproc) OSMesaGetProcAddress },
    { "OSMesaColorClamp", (OSMESAproc) OSMesaColorClamp },
+   { "OSMesaPostprocess", (OSMESAproc) OSMesaPostprocess },
    { NULL, NULL }
 };
 
@@ -850,3 +913,27 @@ OSMesaColorClamp(GLboolean enable)
    _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR_ARB,
                     enable ? GL_TRUE : GL_FIXED_ONLY_ARB);
 }
+
+
+GLAPI void GLAPIENTRY
+OSMesaPostprocess(OSMesaContext osmesa, const char *filter,
+                  unsigned enable_value)
+{
+   if (!osmesa->ever_used) {
+      /* We can only enable/disable postprocess filters before a context
+       * is made current for the first time.
+       */
+      unsigned i;
+
+      for (i = 0; i < PP_FILTERS; i++) {
+         if (strcmp(pp_filters[i].name, filter) == 0) {
+            osmesa->pp_enabled[i] = enable_value;
+            return;
+         }
+      }
+      debug_warning("OSMesaPostprocess(unknown filter)\n");
+   }
+   else {
+      debug_warning("Calling OSMesaPostprocess() after OSMesaMakeCurrent()\n");
+   }
+}

src/mesa/drivers/osmesa/osmesa.c

@@ -1129,6 +1129,7 @@ static struct name_function functions[] = {
    { "OSMesaGetColorBuffer", (OSMESAproc) OSMesaGetColorBuffer },
    { "OSMesaGetProcAddress", (OSMESAproc) OSMesaGetProcAddress },
    { "OSMesaColorClamp", (OSMESAproc) OSMesaColorClamp },
+   { "OSMesaPostprocess" (OSMESAproc) OSMesaPostprocess },
    { NULL, NULL }
 };
 
@@ -1159,6 +1160,16 @@ OSMesaColorClamp(GLboolean enable)
 }
 
 
+GLAPI void GLAPIENTRY
+OSMesaPostprocess(OSMesaContext osmesa, const char *filter,
+                  unsigned enable_value)
+{
+   fprintf(stderr,
+           "OSMesaPostProcess() is only available with gallium drivers\n");
+}
+
+
+
 /**
  * When GLX_INDIRECT_RENDERING is defined, some symbols are missing in
  * libglapi.a.  We need to define them here.