c/client: Get the supported formats from the fd compositor

doc/changes/compositor/mr.282.1.md

@@ -0,0 +1 @@
+client: Propegate the supported formats from the real compositor to the client ones.

src/xrt/compositor/client/comp_gl_client.c

@@ -160,6 +160,20 @@ gl_format_to_vk(int64_t format)
 	}
 }
 
+static int64_t
+vk_format_to_gl(int64_t format)
+{
+	switch (format) {
+	case 37 /*VK_FORMAT_R8G8B8A8_UNORM*/: return GL_RGBA8;
+	case 43 /*VK_FORMAT_R8G8B8A8_SRGB*/: return GL_SRGB8_ALPHA8;
+	case 44 /*VK_FORMAT_B8G8R8A8_UNORM*/: return 0;
+	case 50 /*VK_FORMAT_B8G8R8A8_SRGB*/: return 0;
+	default:
+		printf("Cannot convert VK format %ld to GL format!\n", format);
+		return 0;
+	}
+}
+
 static struct xrt_swapchain *
 client_gl_swapchain_create(struct xrt_compositor *xc,
                            enum xrt_swapchain_create_flags create,
@@ -266,11 +280,20 @@ client_gl_compositor_init(struct client_gl_compositor *c,
 	c->base.base.discard_frame = client_gl_compositor_discard_frame;
 	c->base.base.end_frame = client_gl_compositor_end_frame;
 	c->base.base.destroy = client_gl_compositor_destroy;
-	c->base.base.formats[0] = GL_SRGB8_ALPHA8;
-	c->base.base.formats[1] = GL_RGBA8;
-	c->base.base.num_formats = 2;
 	c->xcfd = xcfd;
 
+	// Passthrough our formats from the fd compositor to the client.
+	size_t count = 0;
+	for (uint32_t i = 0; i < xcfd->base.num_formats; i++) {
+		int64_t f = vk_format_to_gl(xcfd->base.formats[i]);
+		if (f == 0) {
+			continue;
+		}
+
+		c->base.base.formats[count++] = f;
+	}
+	c->base.base.num_formats = count;
+
 	gladLoadGL(get_gl_procaddr);
 
 	if (!GLAD_GL_EXT_memory_object_fd) {

src/xrt/compositor/client/comp_vk_client.c

@@ -262,14 +262,13 @@ client_vk_compositor_create(struct xrt_compositor_fd *xcfd,
 	c->base.base.discard_frame = client_vk_compositor_discard_frame;
 	c->base.base.end_frame = client_vk_compositor_end_frame;
 	c->base.base.destroy = client_vk_compositor_destroy;
-
-	c->base.base.formats[0] = VK_FORMAT_B8G8R8A8_SRGB;
-	c->base.base.formats[1] = VK_FORMAT_R8G8B8A8_SRGB;
-	c->base.base.formats[2] = VK_FORMAT_B8G8R8A8_UNORM;
-	c->base.base.formats[3] = VK_FORMAT_R8G8B8A8_UNORM;
-	c->base.base.num_formats = 4;
-
 	c->xcfd = xcfd;
+	// passthrough our formats from the fd compositor to the client
+	for (uint32_t i = 0; i < xcfd->base.num_formats; i++) {
+		c->base.base.formats[i] = xcfd->base.formats[i];
+	}
+
+	c->base.base.num_formats = xcfd->base.num_formats;
 
 	ret = vk_init_from_given(&c->vk, getProc, instance, physicalDevice,
 	                         device, queueFamilyIndex, queueIndex);

src/xrt/compositor/main/comp_compositor.c

@@ -41,26 +41,24 @@
  * behavior.
  */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <assert.h>
+#include "xrt/xrt_gfx_fd.h"
 
 #include "os/os_time.h"
 
-#include "util/u_debug.h"
+#include "util/u_var.h"
 #include "util/u_misc.h"
 #include "util/u_time.h"
+#include "util/u_debug.h"
 
 #include "main/comp_compositor.h"
 
-#include "xrt/xrt_gfx_fd.h"
-
-#include <unistd.h>
 #include <math.h>
-
-#include "util/u_var.h"
+#include <stdio.h>
+#include <assert.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
 
 
 /*!
@@ -501,6 +499,7 @@ compositor_init_vulkan(struct comp_compositor *c)
 	return ret == VK_SUCCESS;
 }
 
+
 /*
  *
  * Other functions.
@@ -798,7 +797,6 @@ compositor_init_renderer(struct comp_compositor *c)
 	return c->r != NULL;
 }
 
-
 struct xrt_compositor_fd *
 xrt_gfx_provider_create_fd(struct xrt_device *xdev, bool flip_y)
 {
@@ -848,6 +846,16 @@ xrt_gfx_provider_create_fd(struct xrt_device *xdev, bool flip_y)
 
 	COMP_DEBUG(c, "Done %p", (void *)c);
 
+	/*!
+	 * @todo Support more like, depth/float formats etc,
+	 * remember to update the GL client as well.
+	 */
+	// These are the available formats we will expose to our clients.
+	c->base.base.formats[0] = VK_FORMAT_B8G8R8A8_SRGB;
+	c->base.base.formats[1] = VK_FORMAT_R8G8B8A8_SRGB;
+	c->base.base.formats[2] = VK_FORMAT_B8G8R8A8_UNORM;
+	c->base.base.formats[3] = VK_FORMAT_R8G8B8A8_UNORM;
+	c->base.base.num_formats = 4;
 
 	u_var_add_root(c, "Compositor", true);
 	u_var_add_ro_f32(c, &c->compositor_frame_times.fps, "FPS (Compositor)");