egl: Add a egl state_tracker that use Gallium

	This works on top Gallium and KMS. The only thing that
	does not work currently is swap buffers for shown mesa
	screens. So the only fun thing this will produce is a
	white screen.

	The driver wishing to us the state_tracker needs to
	implement the intrace as define in drm_api.h located
	in gallium/include/state_tracker. And also have a
	working KMS implementation.

1 files changed, 85 insertions, 0 deletions

diff --git a/src/gallium/state_trackers/egl/egl_visual.c b/src/gallium/state_trackers/egl/egl_visual.c
new file mode 100644
index 0000000000..e59f893851
--- /dev/null
+++ b/src/gallium/state_trackers/egl/egl_visual.c
@@ -0,0 +1,85 @@
+
+#include "egl_tracker.h"
+
+#include "egllog.h"
+
+void
+drm_visual_modes_destroy(__GLcontextModes *modes)
+{
+   _eglLog(_EGL_DEBUG, "%s", __FUNCTION__);
+
+   while (modes) {
+      __GLcontextModes * const next = modes->next;
+      free(modes);
+      modes = next;
+   }
+}
+
+__GLcontextModes *
+drm_visual_modes_create(unsigned count, size_t minimum_size)
+{
+	/* This code copied from libGLX, and modified */
+	const size_t size = (minimum_size > sizeof(__GLcontextModes))
+		? minimum_size : sizeof(__GLcontextModes);
+	__GLcontextModes * head = NULL;
+	__GLcontextModes ** next;
+	unsigned   i;
+
+	_eglLog(_EGL_DEBUG, "%s %d %d", __FUNCTION__, count, minimum_size);
+
+	next = & head;
+	for (i = 0 ; i < count ; i++) {
+		*next = (__GLcontextModes *) calloc(1, size);
+		if (*next == NULL) {
+			drm_visual_modes_destroy(head);
+			head = NULL;
+			break;
+		}
+
+		(*next)->doubleBufferMode = 1;
+		(*next)->visualID = GLX_DONT_CARE;
+		(*next)->visualType = GLX_DONT_CARE;
+		(*next)->visualRating = GLX_NONE;
+		(*next)->transparentPixel = GLX_NONE;
+		(*next)->transparentRed = GLX_DONT_CARE;
+		(*next)->transparentGreen = GLX_DONT_CARE;
+		(*next)->transparentBlue = GLX_DONT_CARE;
+		(*next)->transparentAlpha = GLX_DONT_CARE;
+		(*next)->transparentIndex = GLX_DONT_CARE;
+		(*next)->xRenderable = GLX_DONT_CARE;
+		(*next)->fbconfigID = GLX_DONT_CARE;
+		(*next)->swapMethod = GLX_SWAP_UNDEFINED_OML;
+		(*next)->bindToTextureRgb = GLX_DONT_CARE;
+		(*next)->bindToTextureRgba = GLX_DONT_CARE;
+		(*next)->bindToMipmapTexture = GLX_DONT_CARE;
+		(*next)->bindToTextureTargets = 0;
+		(*next)->yInverted = GLX_DONT_CARE;
+
+		next = & ((*next)->next);
+	}
+
+	return head;
+}
+
+__GLcontextModes *
+drm_visual_from_config(_EGLConfig *conf)
+{
+	__GLcontextModes *visual;
+	(void)conf;
+
+	visual = drm_visual_modes_create(1, sizeof(*visual));
+	visual->redBits = 8;
+	visual->greenBits = 8;
+	visual->blueBits = 8;
+	visual->alphaBits = 8;
+
+	visual->rgbBits = 32;
+	visual->doubleBufferMode = 1;
+
+	visual->depthBits = 24;
+	visual->haveDepthBuffer = visual->depthBits > 0;
+	visual->stencilBits = 8;
+	visual->haveStencilBuffer = visual->stencilBits > 0;
+
+	return visual;
+}